projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| ded5b9b7 | 1 | /* Copyright (C) 2002, 2003, 2004, 2006, 2011 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 | |
| 16 | License along with the GNU C Library; if not, write to the Free | |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 18 | 02111-1307 USA. */ | |
| 19 | ||
| 20 | #include <errno.h> | |
| 21 | #include <signal.h> | |
| 22 | #include <pthreadP.h> | |
| 23 | #include <tls.h> | |
| 24 | #include <sysdep.h> | |
| db54f488 | 25 | #include <kernel-features.h> |
| 76a50749 UD |
26 | |
| 27 | ||
| 28 | int | |
| 09efc3ba | 29 | __pthread_kill (threadid, signo) |
| 76a50749 UD |
30 | pthread_t threadid; |
| 31 | int signo; | |
| 32 | { | |
| 33 | struct pthread *pd = (struct pthread *) threadid; | |
| 34 | ||
| 8c2e9a29 | 35 | /* Make sure the descriptor is valid. */ |
| fc242bef UD |
36 | if (DEBUGGING_P && INVALID_TD_P (pd)) |
| 37 | /* Not a valid thread handle. */ | |
| 38 | return ESRCH; | |
| 39 | ||
| 33c6de58 | 40 | /* Force load of pd->tid into local variable or register. Otherwise |
| fc242bef UD |
41 | if a thread exits between ESRCH test and tgkill, we might return |
| 42 | EINVAL, because pd->tid would be cleared by the kernel. */ | |
| 43 | pid_t tid = atomic_forced_read (pd->tid); | |
| 44 | if (__builtin_expect (tid <= 0, 0)) | |
| 8c2e9a29 UD |
45 | /* Not a valid thread handle. */ |
| 46 | return ESRCH; | |
| 47 | ||
| ded5b9b7 | 48 | /* Disallow sending the signal we use for cancellation, timers, |
| 53b4fed6 UD |
49 | for the setxid implementation. */ |
| 50 | if (signo == SIGCANCEL || signo == SIGTIMER || signo == SIGSETXID) | |
| e814f748 UD |
51 | return EINVAL; |
| 52 | ||
| 76a50749 | 53 | /* We have a special syscall to do the work. */ |
| e798b60f UD |
54 | INTERNAL_SYSCALL_DECL (err); |
| 55 | ||
| c0ecb80a UD |
56 | /* One comment: The PID field in the TCB can temporarily be changed |
| 57 | (in fork). But this must not affect this code here. Since this | |
| 58 | function would have to be called while the thread is executing | |
| 59 | fork, it would have to happen in a signal handler. But this is | |
| 60 | no allowed, pthread_kill is not guaranteed to be async-safe. */ | |
| db54f488 UD |
61 | int val; |
| 62 | #if __ASSUME_TGKILL | |
| 63 | val = INTERNAL_SYSCALL (tgkill, err, 3, THREAD_GETMEM (THREAD_SELF, pid), | |
| fc242bef | 64 | tid, signo); |
| db54f488 UD |
65 | #else |
| 66 | # ifdef __NR_tgkill | |
| 67 | val = INTERNAL_SYSCALL (tgkill, err, 3, THREAD_GETMEM (THREAD_SELF, pid), | |
| fc242bef | 68 | tid, signo); |
| db54f488 UD |
69 | if (INTERNAL_SYSCALL_ERROR_P (val, err) |
| 70 | && INTERNAL_SYSCALL_ERRNO (val, err) == ENOSYS) | |
| 71 | # endif | |
| fc242bef | 72 | val = INTERNAL_SYSCALL (tkill, err, 2, tid, signo); |
| db54f488 | 73 | #endif |
| e798b60f UD |
74 | |
| 75 | return (INTERNAL_SYSCALL_ERROR_P (val, err) | |
| 76 | ? INTERNAL_SYSCALL_ERRNO (val, err) : 0); | |
| 76a50749 | 77 | } |
| 09efc3ba | 78 | strong_alias (__pthread_kill, pthread_kill) |