mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
89 lines
3.9 KiB
C
89 lines
3.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2022 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/sig.internal.h"
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/intrin/atomic.h"
|
|
#include "libc/intrin/describeflags.h"
|
|
#include "libc/intrin/strace.h"
|
|
#include "libc/runtime/internal.h"
|
|
#include "libc/runtime/syslib.internal.h"
|
|
#include "libc/sysv/consts/sicode.h"
|
|
#include "libc/thread/posixthread.internal.h"
|
|
#include "libc/thread/thread.h"
|
|
|
|
/**
|
|
* Sends signal to thread.
|
|
*
|
|
* @return 0 on success, or errno on error
|
|
* @raise ESRCH if `tid` was valid but no such thread existed
|
|
* @raise EAGAIN if `RLIMIT_SIGPENDING` was exceeded
|
|
* @raise EINVAL if `sig` wasn't a legal signal
|
|
* @raise EPERM if permission was denied
|
|
* @asyncsignalsafe
|
|
*/
|
|
errno_t pthread_kill(pthread_t thread, int sig) {
|
|
int err = 0;
|
|
struct PosixThread *pt;
|
|
pt = (struct PosixThread *)thread;
|
|
if (pt)
|
|
_pthread_ref(pt);
|
|
if (!thread) {
|
|
// avoid crashing on easily predictable npe
|
|
// chances are you need a barrier to synchronize startup
|
|
err = EFAULT;
|
|
} else if (!(1 <= sig && sig <= 64)) {
|
|
// cosmo only supports this many signals
|
|
// some platforms have more but we're not sure what they do
|
|
err = EINVAL;
|
|
} else if (thread == __get_tls()->tib_pthread) {
|
|
err = raise(sig); // XNU will EDEADLK it otherwise
|
|
} else if (atomic_load_explicit(&pt->pt_status, memory_order_acquire) >=
|
|
kPosixThreadTerminated) {
|
|
err = ESRCH;
|
|
} else if (IsWindows()) {
|
|
err = __sig_kill(pt, sig, SI_TKILL);
|
|
} else {
|
|
if (IsXnuSilicon()) {
|
|
err = __syslib->__pthread_kill(_pthread_syshand(pt), sig);
|
|
} else {
|
|
int r = 0;
|
|
int e = errno;
|
|
int tid = _pthread_tid(pt);
|
|
if (IsLinux() || IsFreebsd()) {
|
|
r = sys_tgkill(__pid, tid, sig);
|
|
} else {
|
|
r = sys_tkill(tid, sig, pt->tib);
|
|
}
|
|
if (r) {
|
|
err = errno;
|
|
errno = e;
|
|
}
|
|
}
|
|
if (err == ESRCH)
|
|
err = 0; // we already reported this
|
|
}
|
|
STRACE("pthread_kill(%d, %G) → %s", _pthread_tid(pt), sig,
|
|
DescribeErrno(err));
|
|
if (pt)
|
|
_pthread_unref(pt);
|
|
return err;
|
|
}
|