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2003-12-23 Jakub Jelinek <jakub@redhat.com> * sysdeps/unix/sysv/linux/raise.c (raise): Protect pid = selftid setting with __ASSUME_TGKILL || defined __NR_tgkill. If pid is 0, set it to selftid. * sysdeps/unix/sysv/linux/getpid.c (really_getpid): Make inline. Don't set self->pid but self->tid. If self->pid == 0 and self->tid != 0, return self->tid without doing a syscall. * descr.h (struct pthread): Move pid field after tid. * Makefile (tests): Add tst-raise1. * tst-raise1.c: New file.
75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <signal.h>
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#include <sysdep.h>
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#include <nptl/pthreadP.h>
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#include <kernel-features.h>
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int
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raise (sig)
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int sig;
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{
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struct pthread *pd = THREAD_SELF;
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#if __ASSUME_TGKILL || defined __NR_tgkill
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pid_t pid = THREAD_GETMEM (pd, pid);
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#endif
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pid_t selftid = THREAD_GETMEM (pd, tid);
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if (selftid == 0)
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{
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/* This system call is not supposed to fail. */
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#ifdef INTERNAL_SYSCALL
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INTERNAL_SYSCALL_DECL (err);
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selftid = INTERNAL_SYSCALL (gettid, err, 0);
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#else
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selftid = INLINE_SYSCALL (gettid, 0);
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#endif
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THREAD_SETMEM (pd, tid, selftid);
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#if __ASSUME_TGKILL || defined __NR_tgkill
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/* We do not set the PID field in the TID here since we might be
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called from a signal handler while the thread executes fork. */
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pid = selftid;
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#endif
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}
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#if __ASSUME_TGKILL || defined __NR_tgkill
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else
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/* raise is an async-safe function. It could be called while the
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fork function temporarily invalidated the PID field. Adjust for
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that. */
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if (__builtin_expect (pid <= 0, 0))
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pid = pid == 0 ? selftid : -pid;
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#endif
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#if __ASSUME_TGKILL
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return INLINE_SYSCALL (tgkill, 3, pid, selftid, sig);
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#else
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# ifdef __NR_tgkill
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int res = INLINE_SYSCALL (tgkill, 3, pid, selftid, sig);
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if (res != -1 || errno != ENOSYS)
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return res;
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# endif
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return INLINE_SYSCALL (tkill, 2, selftid, sig);
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#endif
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}
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libc_hidden_def (raise)
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weak_alias (raise, gsignal)
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