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libutil: Properly guard self-allocating getcwd on GNU

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It's a GNU extension, as pointed out by pennae.
This commit is contained in:
Cole Helbling 2022-04-01 12:20:34 -07:00
parent 7f5caaa7c0
commit 2a45cf54e4
1 changed files with 11 additions and 2 deletions
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13
src/libutil/util.cc
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@ -1698,10 +1698,19 @@ void saveMountNamespace()
#if __linux__
static std::once_flag done;
std::call_once(done, []() {
char* cwd = getcwd(NULL, 0);
if (cwd == NULL) throw SysError("getting cwd");
#ifdef __GNU__
// getcwd allocating its return value is a GNU extension.
char *cwd = getcwd(NULL, 0);
if (cwd == NULL)
#else
char cwd[PATH_MAX];
if (!getcwd(cwd, sizeof(cwd)))
#endif
throw SysError("getting cwd");
savedCwd.emplace(cwd);
#ifdef __GNU__
free(cwd);
#endif
AutoCloseFD fd = open("/proc/self/ns/mnt", O_RDONLY);
if (!fd)