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65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/* Copyright (C) 2003-2015 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>, 2003.
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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, see
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<http://www.gnu.org/licenses/>. */
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#include <unistd.h>
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#include <tls.h>
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#include <sysdep.h>
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#if IS_IN (libc)
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static inline __attribute__((always_inline)) pid_t really_getpid (pid_t oldval);
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static inline __attribute__((always_inline)) pid_t
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really_getpid (pid_t oldval)
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{
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if (__glibc_likely (oldval == 0))
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{
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pid_t selftid = THREAD_GETMEM (THREAD_SELF, tid);
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if (__glibc_likely (selftid != 0))
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return selftid;
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}
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INTERNAL_SYSCALL_DECL (err);
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pid_t result = INTERNAL_SYSCALL (getpid, err, 0);
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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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if (oldval == 0)
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THREAD_SETMEM (THREAD_SELF, tid, result);
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return result;
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}
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#endif
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pid_t
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__getpid (void)
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{
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#if !IS_IN (libc)
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INTERNAL_SYSCALL_DECL (err);
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pid_t result = INTERNAL_SYSCALL (getpid, err, 0);
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#else
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pid_t result = THREAD_GETMEM (THREAD_SELF, pid);
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if (__glibc_unlikely (result <= 0))
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result = really_getpid (result);
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#endif
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return result;
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}
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libc_hidden_def (__getpid)
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weak_alias (__getpid, getpid)
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libc_hidden_def (getpid)
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