projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d4697bc9 | 1 | /* Copyright (C) 2002-2014 Free Software Foundation, Inc. |
| 76a50749 UD |
2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 76a50749 UD |
18 | |
| 19 | #include <errno.h> | |
| 20 | #include <signal.h> | |
| 21 | #include <pthreadP.h> | |
| 22 | #include <tls.h> | |
| 23 | #include <sysdep.h> | |
| db54f488 | 24 | #include <kernel-features.h> |
| 76a50749 UD |
25 | |
| 26 | ||
| 27 | int | |
| 09efc3ba | 28 | __pthread_kill (threadid, signo) |
| 76a50749 UD |
29 | pthread_t threadid; |
| 30 | int signo; | |
| 31 | { | |
| 32 | struct pthread *pd = (struct pthread *) threadid; | |
| 33 | ||
| 8c2e9a29 | 34 | /* Make sure the descriptor is valid. */ |
| fc242bef UD |
35 | if (DEBUGGING_P && INVALID_TD_P (pd)) |
| 36 | /* Not a valid thread handle. */ | |
| 37 | return ESRCH; | |
| 38 | ||
| 33c6de58 | 39 | /* Force load of pd->tid into local variable or register. Otherwise |
| fc242bef UD |
40 | if a thread exits between ESRCH test and tgkill, we might return |
| 41 | EINVAL, because pd->tid would be cleared by the kernel. */ | |
| 42 | pid_t tid = atomic_forced_read (pd->tid); | |
| a1ffb40e | 43 | if (__glibc_unlikely (tid <= 0)) |
| 8c2e9a29 UD |
44 | /* Not a valid thread handle. */ |
| 45 | return ESRCH; | |
| 46 | ||
| ded5b9b7 | 47 | /* Disallow sending the signal we use for cancellation, timers, |
| 53b4fed6 UD |
48 | for the setxid implementation. */ |
| 49 | if (signo == SIGCANCEL || signo == SIGTIMER || signo == SIGSETXID) | |
| e814f748 UD |
50 | return EINVAL; |
| 51 | ||
| 76a50749 | 52 | /* We have a special syscall to do the work. */ |
| e798b60f UD |
53 | INTERNAL_SYSCALL_DECL (err); |
| 54 | ||
| c0ecb80a UD |
55 | /* One comment: The PID field in the TCB can temporarily be changed |
| 56 | (in fork). But this must not affect this code here. Since this | |
| 57 | function would have to be called while the thread is executing | |
| 58 | fork, it would have to happen in a signal handler. But this is | |
| 59 | no allowed, pthread_kill is not guaranteed to be async-safe. */ | |
| db54f488 | 60 | int val; |
| db54f488 | 61 | val = INTERNAL_SYSCALL (tgkill, err, 3, THREAD_GETMEM (THREAD_SELF, pid), |
| fc242bef | 62 | tid, signo); |
| e798b60f UD |
63 | |
| 64 | return (INTERNAL_SYSCALL_ERROR_P (val, err) | |
| 65 | ? INTERNAL_SYSCALL_ERRNO (val, err) : 0); | |
| 76a50749 | 66 | } |
| 09efc3ba | 67 | strong_alias (__pthread_kill, pthread_kill) |