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| author | Konstantin Belousov <kib@FreeBSD.org> | 2021-06-07 14:59:41 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2021-06-22 01:45:31 +0000 |
| commit | fc13cbaf6942af73d50659e4728b6b1299a0d028 (patch) | |
| tree | a53c484711cea9573ea758c68f9468e96d216293 | |
| parent | 299912abf26990afdc406ecd3a12f256a8080afe (diff) | |
| download | src-fc13cbaf6942af73d50659e4728b6b1299a0d028.tar.gz src-fc13cbaf6942af73d50659e4728b6b1299a0d028.zip | |
sigwait: add comment explaining EINTR/ERESTART details
(cherry picked from commit acced8b043c5df0ebd51934bca6dcae3322cf890)
| -rw-r--r-- | sys/kern/kern_sig.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c index a2709f38c5cb..1cab25aa5a40 100644 --- a/sys/kern/kern_sig.c +++ b/sys/kern/kern_sig.c @@ -1167,6 +1167,13 @@ sys_sigwait(struct thread *td, struct sigwait_args *uap) error = kern_sigtimedwait(td, set, &ksi, NULL); if (error) { + /* + * sigwait() function shall not return EINTR, but + * the syscall does. Non-ancient libc provides the + * wrapper which hides EINTR. Otherwise, EINTR return + * is used by libthr to handle required cancellation + * point in the sigwait(). + */ if (error == EINTR && td->td_proc->p_osrel < P_OSREL_SIGWAIT) return (ERESTART); td->td_retval[0] = error; |