]>
Commit | Line | Data |
---|---|---|
b168057a | 1 | /* Copyright (C) 2009-2015 Free Software Foundation, Inc. |
bfdb73e1 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2009. | |
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/>. */ | |
bfdb73e1 UD |
18 | |
19 | #include <errno.h> | |
20 | #include <signal.h> | |
21 | #include <string.h> | |
22 | #include <unistd.h> | |
23 | #include <pthreadP.h> | |
24 | #include <tls.h> | |
25 | #include <sysdep.h> | |
bfdb73e1 UD |
26 | |
27 | ||
28 | int | |
bd2260a2 | 29 | pthread_sigqueue (pthread_t threadid, int signo, const union sigval value) |
bfdb73e1 UD |
30 | { |
31 | #ifdef __NR_rt_tgsigqueueinfo | |
32 | struct pthread *pd = (struct pthread *) threadid; | |
33 | ||
34 | /* Make sure the descriptor is valid. */ | |
35 | if (DEBUGGING_P && INVALID_TD_P (pd)) | |
36 | /* Not a valid thread handle. */ | |
37 | return ESRCH; | |
38 | ||
39 | /* Force load of pd->tid into local variable or register. Otherwise | |
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)) |
bfdb73e1 UD |
44 | /* Not a valid thread handle. */ |
45 | return ESRCH; | |
46 | ||
ded5b9b7 | 47 | /* Disallow sending the signal we use for cancellation, timers, |
bfdb73e1 UD |
48 | for the setxid implementation. */ |
49 | if (signo == SIGCANCEL || signo == SIGTIMER || signo == SIGSETXID) | |
50 | return EINVAL; | |
51 | ||
52 | /* Set up the siginfo_t structure. */ | |
53 | siginfo_t info; | |
54 | memset (&info, '\0', sizeof (siginfo_t)); | |
55 | info.si_signo = signo; | |
56 | info.si_code = SI_QUEUE; | |
57 | info.si_pid = THREAD_GETMEM (THREAD_SELF, pid); | |
58 | info.si_uid = getuid (); | |
59 | info.si_value = value; | |
60 | ||
61 | /* We have a special syscall to do the work. */ | |
62 | INTERNAL_SYSCALL_DECL (err); | |
63 | ||
64 | /* One comment: The PID field in the TCB can temporarily be changed | |
65 | (in fork). But this must not affect this code here. Since this | |
66 | function would have to be called while the thread is executing | |
67 | fork, it would have to happen in a signal handler. But this is | |
68 | no allowed, pthread_sigqueue is not guaranteed to be async-safe. */ | |
69 | int val = INTERNAL_SYSCALL (rt_tgsigqueueinfo, err, 4, | |
70 | THREAD_GETMEM (THREAD_SELF, pid), | |
71 | tid, signo, &info); | |
72 | ||
73 | return (INTERNAL_SYSCALL_ERROR_P (val, err) | |
74 | ? INTERNAL_SYSCALL_ERRNO (val, err) : 0); | |
75 | #else | |
76 | return ENOSYS; | |
77 | #endif | |
78 | } |