1146 lines
26 KiB
C++
1146 lines
26 KiB
C++
#include "config.h"
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#include <iostream>
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#include <cerrno>
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#include <cstdio>
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#include <cstdlib>
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#include <sstream>
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#include <cstring>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <limits.h>
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#ifdef __APPLE__
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#include <sys/syscall.h>
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#endif
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#include "util.hh"
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extern char * * environ;
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namespace nix {
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BaseError::BaseError(const format & f, unsigned int status)
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: status(status)
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{
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err = f.str();
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}
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BaseError & BaseError::addPrefix(const format & f)
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{
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prefix_ = f.str() + prefix_;
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return *this;
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}
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SysError::SysError(const format & f)
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: Error(format("%1%: %2%") % f.str() % strerror(errno))
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, errNo(errno)
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{
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}
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string getEnv(const string & key, const string & def)
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{
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char * value = getenv(key.c_str());
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return value ? string(value) : def;
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}
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Path absPath(Path path, Path dir)
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{
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if (path[0] != '/') {
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if (dir == "") {
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#ifdef __GNU__
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/* GNU (aka. GNU/Hurd) doesn't have any limitation on path
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lengths and doesn't define `PATH_MAX'. */
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char *buf = getcwd(NULL, 0);
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if (buf == NULL)
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#else
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char buf[PATH_MAX];
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if (!getcwd(buf, sizeof(buf)))
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#endif
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throw SysError("cannot get cwd");
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dir = buf;
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#ifdef __GNU__
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free(buf);
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#endif
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}
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path = dir + "/" + path;
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}
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return canonPath(path);
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}
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Path canonPath(const Path & path, bool resolveSymlinks)
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{
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string s;
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if (path[0] != '/')
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throw Error(format("not an absolute path: `%1%'") % path);
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string::const_iterator i = path.begin(), end = path.end();
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string temp;
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/* Count the number of times we follow a symlink and stop at some
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arbitrary (but high) limit to prevent infinite loops. */
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unsigned int followCount = 0, maxFollow = 1024;
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while (1) {
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/* Skip slashes. */
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while (i != end && *i == '/') i++;
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if (i == end) break;
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/* Ignore `.'. */
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if (*i == '.' && (i + 1 == end || i[1] == '/'))
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i++;
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/* If `..', delete the last component. */
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else if (*i == '.' && i + 1 < end && i[1] == '.' &&
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(i + 2 == end || i[2] == '/'))
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{
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if (!s.empty()) s.erase(s.rfind('/'));
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i += 2;
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}
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/* Normal component; copy it. */
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else {
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s += '/';
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while (i != end && *i != '/') s += *i++;
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/* If s points to a symlink, resolve it and restart (since
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the symlink target might contain new symlinks). */
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if (resolveSymlinks && isLink(s)) {
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if (++followCount >= maxFollow)
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throw Error(format("infinite symlink recursion in path `%1%'") % path);
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temp = absPath(readLink(s), dirOf(s))
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+ string(i, end);
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i = temp.begin(); /* restart */
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end = temp.end();
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s = "";
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/* !!! potential for infinite loop */
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}
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}
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}
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return s.empty() ? "/" : s;
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}
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Path dirOf(const Path & path)
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{
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Path::size_type pos = path.rfind('/');
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if (pos == string::npos)
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throw Error(format("invalid file name `%1%'") % path);
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return pos == 0 ? "/" : Path(path, 0, pos);
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}
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string baseNameOf(const Path & path)
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{
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Path::size_type pos = path.rfind('/');
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if (pos == string::npos)
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throw Error(format("invalid file name `%1%'") % path);
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return string(path, pos + 1);
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}
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bool isInDir(const Path & path, const Path & dir)
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{
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return path[0] == '/'
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&& string(path, 0, dir.size()) == dir
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&& path.size() >= dir.size() + 2
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&& path[dir.size()] == '/';
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}
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struct stat lstat(const Path & path)
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{
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struct stat st;
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if (lstat(path.c_str(), &st))
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throw SysError(format("getting status of `%1%'") % path);
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return st;
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}
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bool pathExists(const Path & path)
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{
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int res;
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struct stat st;
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res = lstat(path.c_str(), &st);
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if (!res) return true;
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if (errno != ENOENT && errno != ENOTDIR)
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throw SysError(format("getting status of %1%") % path);
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return false;
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}
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Path readLink(const Path & path)
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{
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checkInterrupt();
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struct stat st = lstat(path);
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if (!S_ISLNK(st.st_mode))
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throw Error(format("`%1%' is not a symlink") % path);
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char buf[st.st_size];
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if (readlink(path.c_str(), buf, st.st_size) != st.st_size)
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throw SysError(format("reading symbolic link `%1%'") % path);
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return string(buf, st.st_size);
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}
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bool isLink(const Path & path)
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{
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struct stat st = lstat(path);
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return S_ISLNK(st.st_mode);
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}
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Strings readDirectory(const Path & path)
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{
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Strings names;
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AutoCloseDir dir = opendir(path.c_str());
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if (!dir) throw SysError(format("opening directory `%1%'") % path);
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struct dirent * dirent;
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while (errno = 0, dirent = readdir(dir)) { /* sic */
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checkInterrupt();
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string name = dirent->d_name;
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if (name == "." || name == "..") continue;
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names.push_back(name);
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}
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if (errno) throw SysError(format("reading directory `%1%'") % path);
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return names;
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}
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string readFile(int fd)
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{
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struct stat st;
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if (fstat(fd, &st) == -1)
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throw SysError("statting file");
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unsigned char * buf = new unsigned char[st.st_size];
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AutoDeleteArray<unsigned char> d(buf);
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readFull(fd, buf, st.st_size);
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return string((char *) buf, st.st_size);
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}
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string readFile(const Path & path, bool drain)
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{
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AutoCloseFD fd = open(path.c_str(), O_RDONLY);
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if (fd == -1)
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throw SysError(format("opening file `%1%'") % path);
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return drain ? drainFD(fd) : readFile(fd);
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}
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void writeFile(const Path & path, const string & s)
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{
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AutoCloseFD fd = open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT, 0666);
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if (fd == -1)
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throw SysError(format("opening file `%1%'") % path);
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writeFull(fd, (unsigned char *) s.data(), s.size());
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}
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string readLine(int fd)
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{
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string s;
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while (1) {
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checkInterrupt();
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char ch;
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ssize_t rd = read(fd, &ch, 1);
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if (rd == -1) {
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if (errno != EINTR)
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throw SysError("reading a line");
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} else if (rd == 0)
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throw EndOfFile("unexpected EOF reading a line");
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else {
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if (ch == '\n') return s;
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s += ch;
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}
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}
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}
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void writeLine(int fd, string s)
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{
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s += '\n';
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writeFull(fd, (const unsigned char *) s.data(), s.size());
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}
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static void _computePathSize(const Path & path,
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unsigned long long & bytes, unsigned long long & blocks)
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{
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checkInterrupt();
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struct stat st = lstat(path);
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bytes += st.st_size;
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blocks += st.st_blocks;
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if (S_ISDIR(st.st_mode)) {
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Strings names = readDirectory(path);
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for (Strings::iterator i = names.begin(); i != names.end(); ++i)
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_computePathSize(path + "/" + *i, bytes, blocks);
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}
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}
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void computePathSize(const Path & path,
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unsigned long long & bytes, unsigned long long & blocks)
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{
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bytes = 0;
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blocks = 0;
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_computePathSize(path, bytes, blocks);
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}
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static void _deletePath(const Path & path, unsigned long long & bytesFreed)
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{
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checkInterrupt();
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printMsg(lvlVomit, format("%1%") % path);
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struct stat st = lstat(path);
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if (!S_ISDIR(st.st_mode) && st.st_nlink == 1)
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bytesFreed += st.st_blocks * 512;
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if (S_ISDIR(st.st_mode)) {
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Strings names = readDirectory(path);
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/* Make the directory writable. */
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if (!(st.st_mode & S_IWUSR)) {
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if (chmod(path.c_str(), st.st_mode | S_IWUSR) == -1)
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throw SysError(format("making `%1%' writable") % path);
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}
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for (Strings::iterator i = names.begin(); i != names.end(); ++i)
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_deletePath(path + "/" + *i, bytesFreed);
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}
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if (remove(path.c_str()) == -1)
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throw SysError(format("cannot unlink `%1%'") % path);
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}
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void deletePath(const Path & path)
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{
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unsigned long long dummy;
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deletePath(path, dummy);
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}
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void deletePath(const Path & path, unsigned long long & bytesFreed)
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{
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startNest(nest, lvlDebug,
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format("recursively deleting path `%1%'") % path);
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bytesFreed = 0;
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_deletePath(path, bytesFreed);
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}
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void makePathReadOnly(const Path & path)
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{
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checkInterrupt();
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struct stat st = lstat(path);
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if (!S_ISLNK(st.st_mode) && (st.st_mode & S_IWUSR)) {
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if (chmod(path.c_str(), st.st_mode & ~S_IWUSR) == -1)
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throw SysError(format("making `%1%' read-only") % path);
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}
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if (S_ISDIR(st.st_mode)) {
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Strings names = readDirectory(path);
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for (Strings::iterator i = names.begin(); i != names.end(); ++i)
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makePathReadOnly(path + "/" + *i);
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}
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}
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static Path tempName(Path tmpRoot, const Path & prefix, bool includePid,
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int & counter)
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{
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tmpRoot = canonPath(tmpRoot.empty() ? getEnv("TMPDIR", "/tmp") : tmpRoot, true);
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if (includePid)
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return (format("%1%/%2%-%3%-%4%") % tmpRoot % prefix % getpid() % counter++).str();
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else
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return (format("%1%/%2%-%3%") % tmpRoot % prefix % counter++).str();
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}
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Path createTempDir(const Path & tmpRoot, const Path & prefix,
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bool includePid, bool useGlobalCounter, mode_t mode)
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{
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static int globalCounter = 0;
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int localCounter = 0;
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int & counter(useGlobalCounter ? globalCounter : localCounter);
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while (1) {
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checkInterrupt();
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Path tmpDir = tempName(tmpRoot, prefix, includePid, counter);
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if (mkdir(tmpDir.c_str(), mode) == 0) {
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/* Explicitly set the group of the directory. This is to
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work around around problems caused by BSD's group
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ownership semantics (directories inherit the group of
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the parent). For instance, the group of /tmp on
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FreeBSD is "wheel", so all directories created in /tmp
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will be owned by "wheel"; but if the user is not in
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"wheel", then "tar" will fail to unpack archives that
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have the setgid bit set on directories. */
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if (chown(tmpDir.c_str(), (uid_t) -1, getegid()) != 0)
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throw SysError(format("setting group of directory `%1%'") % tmpDir);
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return tmpDir;
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}
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if (errno != EEXIST)
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throw SysError(format("creating directory `%1%'") % tmpDir);
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}
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}
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Paths createDirs(const Path & path)
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{
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Paths created;
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if (path == "/") return created;
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struct stat st;
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if (lstat(path.c_str(), &st) == -1) {
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created = createDirs(dirOf(path));
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if (mkdir(path.c_str(), 0777) == -1 && errno != EEXIST)
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throw SysError(format("creating directory `%1%'") % path);
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st = lstat(path);
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created.push_back(path);
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}
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if (!S_ISDIR(st.st_mode)) throw Error(format("`%1%' is not a directory") % path);
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return created;
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}
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LogType logType = ltPretty;
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Verbosity verbosity = lvlInfo;
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static int nestingLevel = 0;
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Nest::Nest()
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{
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nest = false;
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}
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Nest::~Nest()
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{
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close();
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}
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static string escVerbosity(Verbosity level)
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{
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return int2String((int) level);
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}
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void Nest::open(Verbosity level, const format & f)
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{
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if (level <= verbosity) {
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if (logType == ltEscapes)
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std::cerr << "\033[" << escVerbosity(level) << "p"
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<< f.str() << "\n";
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else
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printMsg_(level, f);
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nest = true;
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nestingLevel++;
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}
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}
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void Nest::close()
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{
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if (nest) {
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nestingLevel--;
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if (logType == ltEscapes)
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std::cerr << "\033[q";
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nest = false;
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}
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}
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void printMsg_(Verbosity level, const format & f)
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{
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checkInterrupt();
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if (level > verbosity) return;
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string prefix;
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if (logType == ltPretty)
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for (int i = 0; i < nestingLevel; i++)
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prefix += "| ";
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else if (logType == ltEscapes && level != lvlInfo)
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prefix = "\033[" + escVerbosity(level) + "s";
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string s = (format("%1%%2%\n") % prefix % f.str()).str();
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writeToStderr(s);
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}
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void warnOnce(bool & haveWarned, const format & f)
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{
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if (!haveWarned) {
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printMsg(lvlError, format("warning: %1%") % f.str());
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haveWarned = true;
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}
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}
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void writeToStderr(const string & s)
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{
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try {
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_writeToStderr((const unsigned char *) s.data(), s.size());
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} catch (SysError & e) {
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/* Ignore failing writes to stderr if we're in an exception
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handler, otherwise throw an exception. We need to ignore
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write errors in exception handlers to ensure that cleanup
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code runs to completion if the other side of stderr has
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been closed unexpectedly. */
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if (!std::uncaught_exception()) throw;
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}
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}
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static void defaultWriteToStderr(const unsigned char * buf, size_t count)
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{
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writeFull(STDERR_FILENO, buf, count);
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}
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void (*_writeToStderr) (const unsigned char * buf, size_t count) = defaultWriteToStderr;
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void readFull(int fd, unsigned char * buf, size_t count)
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{
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while (count) {
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checkInterrupt();
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ssize_t res = read(fd, (char *) buf, count);
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if (res == -1) {
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if (errno == EINTR) continue;
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throw SysError("reading from file");
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}
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if (res == 0) throw EndOfFile("unexpected end-of-file");
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count -= res;
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buf += res;
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}
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}
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void writeFull(int fd, const unsigned char * buf, size_t count)
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{
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while (count) {
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checkInterrupt();
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ssize_t res = write(fd, (char *) buf, count);
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if (res == -1) {
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if (errno == EINTR) continue;
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throw SysError("writing to file");
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}
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count -= res;
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buf += res;
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}
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}
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string drainFD(int fd)
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{
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string result;
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unsigned char buffer[4096];
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while (1) {
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checkInterrupt();
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ssize_t rd = read(fd, buffer, sizeof buffer);
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if (rd == -1) {
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if (errno != EINTR)
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throw SysError("reading from file");
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}
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else if (rd == 0) break;
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else result.append((char *) buffer, rd);
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}
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return result;
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}
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|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
AutoDelete::AutoDelete(const string & p, bool recursive) : path(p)
|
|
{
|
|
del = true;
|
|
this->recursive = recursive;
|
|
}
|
|
|
|
AutoDelete::~AutoDelete()
|
|
{
|
|
try {
|
|
if (del) {
|
|
if (recursive)
|
|
deletePath(path);
|
|
else {
|
|
if (remove(path.c_str()) == -1)
|
|
throw SysError(format("cannot unlink `%1%'") % path);
|
|
}
|
|
}
|
|
} catch (...) {
|
|
ignoreException();
|
|
}
|
|
}
|
|
|
|
void AutoDelete::cancel()
|
|
{
|
|
del = false;
|
|
}
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
AutoCloseFD::AutoCloseFD()
|
|
{
|
|
fd = -1;
|
|
}
|
|
|
|
|
|
AutoCloseFD::AutoCloseFD(int fd)
|
|
{
|
|
this->fd = fd;
|
|
}
|
|
|
|
|
|
AutoCloseFD::AutoCloseFD(const AutoCloseFD & fd)
|
|
{
|
|
/* Copying an AutoCloseFD isn't allowed (who should get to close
|
|
it?). But as an edge case, allow copying of closed
|
|
AutoCloseFDs. This is necessary due to tiresome reasons
|
|
involving copy constructor use on default object values in STL
|
|
containers (like when you do `map[value]' where value isn't in
|
|
the map yet). */
|
|
this->fd = fd.fd;
|
|
if (this->fd != -1) abort();
|
|
}
|
|
|
|
|
|
AutoCloseFD::~AutoCloseFD()
|
|
{
|
|
try {
|
|
close();
|
|
} catch (...) {
|
|
ignoreException();
|
|
}
|
|
}
|
|
|
|
|
|
void AutoCloseFD::operator =(int fd)
|
|
{
|
|
if (this->fd != fd) close();
|
|
this->fd = fd;
|
|
}
|
|
|
|
|
|
AutoCloseFD::operator int() const
|
|
{
|
|
return fd;
|
|
}
|
|
|
|
|
|
void AutoCloseFD::close()
|
|
{
|
|
if (fd != -1) {
|
|
if (::close(fd) == -1)
|
|
/* This should never happen. */
|
|
throw SysError(format("closing file descriptor %1%") % fd);
|
|
fd = -1;
|
|
}
|
|
}
|
|
|
|
|
|
bool AutoCloseFD::isOpen()
|
|
{
|
|
return fd != -1;
|
|
}
|
|
|
|
|
|
/* Pass responsibility for closing this fd to the caller. */
|
|
int AutoCloseFD::borrow()
|
|
{
|
|
int oldFD = fd;
|
|
fd = -1;
|
|
return oldFD;
|
|
}
|
|
|
|
|
|
void Pipe::create()
|
|
{
|
|
int fds[2];
|
|
if (pipe(fds) != 0) throw SysError("creating pipe");
|
|
readSide = fds[0];
|
|
writeSide = fds[1];
|
|
closeOnExec(readSide);
|
|
closeOnExec(writeSide);
|
|
}
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
AutoCloseDir::AutoCloseDir()
|
|
{
|
|
dir = 0;
|
|
}
|
|
|
|
|
|
AutoCloseDir::AutoCloseDir(DIR * dir)
|
|
{
|
|
this->dir = dir;
|
|
}
|
|
|
|
|
|
AutoCloseDir::~AutoCloseDir()
|
|
{
|
|
close();
|
|
}
|
|
|
|
|
|
void AutoCloseDir::operator =(DIR * dir)
|
|
{
|
|
this->dir = dir;
|
|
}
|
|
|
|
|
|
AutoCloseDir::operator DIR *()
|
|
{
|
|
return dir;
|
|
}
|
|
|
|
|
|
void AutoCloseDir::close()
|
|
{
|
|
if (dir) {
|
|
closedir(dir);
|
|
dir = 0;
|
|
}
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
Pid::Pid()
|
|
{
|
|
pid = -1;
|
|
separatePG = false;
|
|
killSignal = SIGKILL;
|
|
}
|
|
|
|
|
|
Pid::~Pid()
|
|
{
|
|
kill();
|
|
}
|
|
|
|
|
|
void Pid::operator =(pid_t pid)
|
|
{
|
|
if (this->pid != pid) kill();
|
|
this->pid = pid;
|
|
killSignal = SIGKILL; // reset signal to default
|
|
}
|
|
|
|
|
|
Pid::operator pid_t()
|
|
{
|
|
return pid;
|
|
}
|
|
|
|
|
|
void Pid::kill()
|
|
{
|
|
if (pid == -1 || pid == 0) return;
|
|
|
|
printMsg(lvlError, format("killing process %1%") % pid);
|
|
|
|
/* Send the requested signal to the child. If it has its own
|
|
process group, send the signal to every process in the child
|
|
process group (which hopefully includes *all* its children). */
|
|
if (::kill(separatePG ? -pid : pid, killSignal) != 0)
|
|
printMsg(lvlError, (SysError(format("killing process %1%") % pid).msg()));
|
|
|
|
/* Wait until the child dies, disregarding the exit status. */
|
|
int status;
|
|
while (waitpid(pid, &status, 0) == -1) {
|
|
checkInterrupt();
|
|
if (errno != EINTR) {
|
|
printMsg(lvlError,
|
|
(SysError(format("waiting for process %1%") % pid).msg()));
|
|
break;
|
|
}
|
|
}
|
|
|
|
pid = -1;
|
|
}
|
|
|
|
|
|
int Pid::wait(bool block)
|
|
{
|
|
assert(pid != -1);
|
|
while (1) {
|
|
int status;
|
|
int res = waitpid(pid, &status, block ? 0 : WNOHANG);
|
|
if (res == pid) {
|
|
pid = -1;
|
|
return status;
|
|
}
|
|
if (res == 0 && !block) return -1;
|
|
if (errno != EINTR)
|
|
throw SysError("cannot get child exit status");
|
|
checkInterrupt();
|
|
}
|
|
}
|
|
|
|
|
|
void Pid::setSeparatePG(bool separatePG)
|
|
{
|
|
this->separatePG = separatePG;
|
|
}
|
|
|
|
|
|
void Pid::setKillSignal(int signal)
|
|
{
|
|
this->killSignal = signal;
|
|
}
|
|
|
|
|
|
void killUser(uid_t uid)
|
|
{
|
|
debug(format("killing all processes running under uid `%1%'") % uid);
|
|
|
|
assert(uid != 0); /* just to be safe... */
|
|
|
|
/* The system call kill(-1, sig) sends the signal `sig' to all
|
|
users to which the current process can send signals. So we
|
|
fork a process, switch to uid, and send a mass kill. */
|
|
|
|
Pid pid;
|
|
pid = fork();
|
|
switch (pid) {
|
|
|
|
case -1:
|
|
throw SysError("unable to fork");
|
|
|
|
case 0:
|
|
try { /* child */
|
|
|
|
if (setuid(uid) == -1)
|
|
throw SysError("setting uid");
|
|
|
|
while (true) {
|
|
#ifdef __APPLE__
|
|
/* OSX's kill syscall takes a third parameter that, among other
|
|
things, determines if kill(-1, signo) affects the calling
|
|
process. In the OSX libc, it's set to true, which means
|
|
"follow POSIX", which we don't want here
|
|
*/
|
|
if (syscall(SYS_kill, -1, SIGKILL, false) == 0) break;
|
|
#else
|
|
if (kill(-1, SIGKILL) == 0) break;
|
|
#endif
|
|
if (errno == ESRCH) break; /* no more processes */
|
|
if (errno != EINTR)
|
|
throw SysError(format("cannot kill processes for uid `%1%'") % uid);
|
|
}
|
|
|
|
} catch (std::exception & e) {
|
|
writeToStderr((format("killing processes belonging to uid `%1%': %2%\n") % uid % e.what()).str());
|
|
_exit(1);
|
|
}
|
|
_exit(0);
|
|
}
|
|
|
|
/* parent */
|
|
int status = pid.wait(true);
|
|
if (status != 0)
|
|
throw Error(format("cannot kill processes for uid `%1%': %2%") % uid % statusToString(status));
|
|
|
|
/* !!! We should really do some check to make sure that there are
|
|
no processes left running under `uid', but there is no portable
|
|
way to do so (I think). The most reliable way may be `ps -eo
|
|
uid | grep -q $uid'. */
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
string runProgram(Path program, bool searchPath, const Strings & args)
|
|
{
|
|
checkInterrupt();
|
|
|
|
std::vector<const char *> cargs; /* careful with c_str()! */
|
|
cargs.push_back(program.c_str());
|
|
for (Strings::const_iterator i = args.begin(); i != args.end(); ++i)
|
|
cargs.push_back(i->c_str());
|
|
cargs.push_back(0);
|
|
|
|
/* Create a pipe. */
|
|
Pipe pipe;
|
|
pipe.create();
|
|
|
|
/* Fork. */
|
|
Pid pid;
|
|
pid = maybeVfork();
|
|
|
|
switch (pid) {
|
|
|
|
case -1:
|
|
throw SysError("unable to fork");
|
|
|
|
case 0: /* child */
|
|
try {
|
|
if (dup2(pipe.writeSide, STDOUT_FILENO) == -1)
|
|
throw SysError("dupping stdout");
|
|
|
|
if (searchPath)
|
|
execvp(program.c_str(), (char * *) &cargs[0]);
|
|
else
|
|
execv(program.c_str(), (char * *) &cargs[0]);
|
|
throw SysError(format("executing `%1%'") % program);
|
|
|
|
} catch (std::exception & e) {
|
|
writeToStderr("error: " + string(e.what()) + "\n");
|
|
}
|
|
_exit(1);
|
|
}
|
|
|
|
/* Parent. */
|
|
|
|
pipe.writeSide.close();
|
|
|
|
string result = drainFD(pipe.readSide);
|
|
|
|
/* Wait for the child to finish. */
|
|
int status = pid.wait(true);
|
|
if (!statusOk(status))
|
|
throw Error(format("program `%1%' %2%")
|
|
% program % statusToString(status));
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
void closeMostFDs(const set<int> & exceptions)
|
|
{
|
|
int maxFD = 0;
|
|
maxFD = sysconf(_SC_OPEN_MAX);
|
|
for (int fd = 0; fd < maxFD; ++fd)
|
|
if (fd != STDIN_FILENO && fd != STDOUT_FILENO && fd != STDERR_FILENO
|
|
&& exceptions.find(fd) == exceptions.end())
|
|
close(fd); /* ignore result */
|
|
}
|
|
|
|
|
|
void closeOnExec(int fd)
|
|
{
|
|
int prev;
|
|
if ((prev = fcntl(fd, F_GETFD, 0)) == -1 ||
|
|
fcntl(fd, F_SETFD, prev | FD_CLOEXEC) == -1)
|
|
throw SysError("setting close-on-exec flag");
|
|
}
|
|
|
|
|
|
#if HAVE_VFORK
|
|
pid_t (*maybeVfork)() = vfork;
|
|
#else
|
|
pid_t (*maybeVfork)() = fork;
|
|
#endif
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
volatile sig_atomic_t _isInterrupted = 0;
|
|
|
|
void _interrupted()
|
|
{
|
|
/* Block user interrupts while an exception is being handled.
|
|
Throwing an exception while another exception is being handled
|
|
kills the program! */
|
|
if (!std::uncaught_exception()) {
|
|
_isInterrupted = 0;
|
|
throw Interrupted("interrupted by the user");
|
|
}
|
|
}
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
template<class C> C tokenizeString(const string & s, const string & separators)
|
|
{
|
|
C result;
|
|
string::size_type pos = s.find_first_not_of(separators, 0);
|
|
while (pos != string::npos) {
|
|
string::size_type end = s.find_first_of(separators, pos + 1);
|
|
if (end == string::npos) end = s.size();
|
|
string token(s, pos, end - pos);
|
|
result.insert(result.end(), token);
|
|
pos = s.find_first_not_of(separators, end);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
template Strings tokenizeString(const string & s, const string & separators);
|
|
template StringSet tokenizeString(const string & s, const string & separators);
|
|
template vector<string> tokenizeString(const string & s, const string & separators);
|
|
|
|
|
|
string concatStringsSep(const string & sep, const Strings & ss)
|
|
{
|
|
string s;
|
|
foreach (Strings::const_iterator, i, ss) {
|
|
if (s.size() != 0) s += sep;
|
|
s += *i;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
|
|
string concatStringsSep(const string & sep, const StringSet & ss)
|
|
{
|
|
string s;
|
|
foreach (StringSet::const_iterator, i, ss) {
|
|
if (s.size() != 0) s += sep;
|
|
s += *i;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
|
|
string chomp(const string & s)
|
|
{
|
|
size_t i = s.find_last_not_of(" \n\r\t");
|
|
return i == string::npos ? "" : string(s, 0, i + 1);
|
|
}
|
|
|
|
|
|
string statusToString(int status)
|
|
{
|
|
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
|
|
if (WIFEXITED(status))
|
|
return (format("failed with exit code %1%") % WEXITSTATUS(status)).str();
|
|
else if (WIFSIGNALED(status)) {
|
|
int sig = WTERMSIG(status);
|
|
#if HAVE_STRSIGNAL
|
|
const char * description = strsignal(sig);
|
|
return (format("failed due to signal %1% (%2%)") % sig % description).str();
|
|
#else
|
|
return (format("failed due to signal %1%") % sig).str();
|
|
#endif
|
|
}
|
|
else
|
|
return "died abnormally";
|
|
} else return "succeeded";
|
|
}
|
|
|
|
|
|
bool statusOk(int status)
|
|
{
|
|
return WIFEXITED(status) && WEXITSTATUS(status) == 0;
|
|
}
|
|
|
|
|
|
bool hasSuffix(const string & s, const string & suffix)
|
|
{
|
|
return s.size() >= suffix.size() && string(s, s.size() - suffix.size()) == suffix;
|
|
}
|
|
|
|
|
|
void expect(std::istream & str, const string & s)
|
|
{
|
|
char s2[s.size()];
|
|
str.read(s2, s.size());
|
|
if (string(s2, s.size()) != s)
|
|
throw Error(format("expected string `%1%'") % s);
|
|
}
|
|
|
|
|
|
string parseString(std::istream & str)
|
|
{
|
|
string res;
|
|
expect(str, "\"");
|
|
int c;
|
|
while ((c = str.get()) != '"')
|
|
if (c == '\\') {
|
|
c = str.get();
|
|
if (c == 'n') res += '\n';
|
|
else if (c == 'r') res += '\r';
|
|
else if (c == 't') res += '\t';
|
|
else res += c;
|
|
}
|
|
else res += c;
|
|
return res;
|
|
}
|
|
|
|
|
|
bool endOfList(std::istream & str)
|
|
{
|
|
if (str.peek() == ',') {
|
|
str.get();
|
|
return false;
|
|
}
|
|
if (str.peek() == ']') {
|
|
str.get();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
string decodeOctalEscaped(const string & s)
|
|
{
|
|
string r;
|
|
for (string::const_iterator i = s.begin(); i != s.end(); ) {
|
|
if (*i != '\\') { r += *i++; continue; }
|
|
unsigned char c = 0;
|
|
++i;
|
|
while (i != s.end() && *i >= '0' && *i < '8')
|
|
c = c * 8 + (*i++ - '0');
|
|
r += c;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
|
|
void ignoreException()
|
|
{
|
|
try {
|
|
throw;
|
|
} catch (std::exception & e) {
|
|
printMsg(lvlError, format("error (ignored): %1%") % e.what());
|
|
}
|
|
}
|
|
|
|
|
|
}
|