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Explicitly initialize sigaction::sa_mask members with sigemptyset(3)

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Not doing so before calling sigaction(3) is "undefined" according to
POSIX[1]:

> Applications shall call either sigemptyset() or sigfillset() at least
> once for each object of type sigset_t prior to any other use of that
> object. If such an object is not initialized in this way, but is
> nonetheless supplied as an argument to any of pthread_sigmask(),
> sigaction(), sigaddset(), sigdelset(), sigismember(), sigpending(),
> sigprocmask(), sigsuspend(), sigtimedwait(), sigwait(), or
> sigwaitinfo(), the results are undefined.

The use of designated initializers means that sa_mask members were
still being initialized, but sigset_t is an opaque type and implicit
initialization doesn't necessarily produce the same results as using
sigemptyset(3) (although it typically does on most implementations).

[1]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/sigaddset.html
This commit is contained in:
Craig Barnes 2022-02-12 12:04:57 +00:00
parent d34c8007f1
commit 23cf80667a
6 changed files with 16 additions and 6 deletions
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4
spawn.c
View file

@ -45,7 +45,9 @@ spawn(struct reaper *reaper, const char *cwd, char *const argv[],
goto child_err;
/* Restore ignored (SIG_IGN) signals */
if (sigaction(SIGHUP, &(struct sigaction){.sa_handler = SIG_DFL}, NULL) < 0)
struct sigaction dfl = {.sa_handler = SIG_DFL};
sigemptyset(&dfl.sa_mask);
if (sigaction(SIGHUP, &dfl, NULL) < 0)
goto child_err;
if (cwd != NULL && chdir(cwd) < 0) {