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Fall back to FD_CLOEXEC when O_CLOEXEC is unavailable.

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Older Linux systems don't have O_CLOEXEC.  If that's the case, we fcntl
immediately after open, to minimize the length of the racy period in
which an
operation in another thread can leak a file descriptor to a child.
This commit is contained in:
Y. T. Chung 2017-07-20 23:02:23 +08:00 • committed by David Goldblatt
parent fb6787a78c
commit 0975b88dfd
2 changed files with 28 additions and 5 deletions
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6
src/prof.c
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@ -1409,7 +1409,13 @@ prof_open_maps(const char *format, ...) {
va_start(ap, format);
malloc_vsnprintf(filename, sizeof(filename), format, ap);
va_end(ap);
#if defined(O_CLOEXEC)
mfd = open(filename, O_RDONLY | O_CLOEXEC);
#else
mfd = open(filename, O_RDONLY);
fcntl(mfd, F_SETFD, fcntl(mfd, F_GETFD) | FD_CLOEXEC);
#endif
return mfd;
}