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Introduce sigtimedwait() and sigwaitinfo()

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This change also invents sigcountset() and strsignal_r() and improves
the quality of siginfo_t handling.
This commit is contained in:
Justine Tunney 2022-10-10 07:36:07 -07:00
parent 7ae556463a
commit 467a332e38
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GPG key ID: BE714B4575D6E328
41 changed files with 887 additions and 345 deletions
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25
libc/calls/sigpending.c
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@ -17,37 +17,44 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/sig.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/calls/struct/sigset.h"
#include "libc/calls/struct/sigset.internal.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/sysv/errfuns.h"
/**
* Determines the blocked pending signals
*
* @param pending is where the bitset of pending signals is returned,
* may not be NULL.
* @return -1 w/ EFAULT
* which may not be null
* @return 0 on success, or -1 w/ errno
* @raise EFAULT if `pending` points to invalid memory
* @asyncsignalsafe
*/
int sigpending(sigset_t *pending) {
int rc;
if (IsAsan() && !__asan_is_valid(pending, sizeof(*pending))) {
if (!pending || (IsAsan() && !__asan_is_valid(pending, sizeof(*pending)))) {
rc = efault();
} else if (IsLinux() || IsNetbsd() || IsOpenbsd() || IsFreebsd() || IsXnu()) {
// 128 signals on NetBSD and FreeBSD, 64 on Linux, 32 on OpenBSD and XNU
rc = sys_sigpending(pending, 8);
// 128 signals on NetBSD and FreeBSD, 64 on Linux, 32 on OpenBSD and XNU.
// OpenBSD passes signal sets in words rather than pointers
if (IsOpenbsd()) {
pending->__bits[0] = (unsigned)rc;
rc = 0;
} else if (IsXnu()) {
pending->__bits[0] &= 0xFFFFFFFF;
}
if (IsLinux() || IsOpenbsd() || IsXnu()) {
pending->__bits[1] = 0;
// only modify memory on success
if (!rc) {
// clear unsupported bits
if (IsXnu()) {
pending->__bits[0] &= 0xFFFFFFFF;
}
if (IsLinux() || IsOpenbsd() || IsXnu()) {
pending->__bits[1] = 0;
}
}
} else if (IsWindows()) {
sigemptyset(pending);