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glibc  2.9
signalfd.c
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00001 /* Copyright (C) 2007, 2008 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <signal.h>
00021 #include <sys/signalfd.h>
00022 #include <sysdep.h>
00023 
00024 
00025 int
00026 signalfd (int fd, const sigset_t *mask, int flags)
00027 {
00028 #ifdef __NR_signalfd4
00029   return INLINE_SYSCALL (signalfd4, 4, fd, mask, _NSIG / 8, flags);
00030 #else
00031   /* The old system call has no flag parameter which is bad.  So we have
00032      to wait until we have to support to pass additional values to the
00033      kernel (sys_indirect) before implementing setting flags like
00034      O_NONBLOCK etc.  */
00035   if (flags != 0)
00036     {
00037       __set_errno (EINVAL);
00038       return -1;
00039     }
00040 
00041 # ifdef __NR_signalfd
00042   return INLINE_SYSCALL (signalfd, 3, fd, mask, _NSIG / 8);
00043 # else
00044   __set_errno (ENOSYS);
00045   return -1;
00046 # endif
00047 #endif
00048 }