From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- sysdeps/unix/sysv/sigaction.c | 83 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 sysdeps/unix/sysv/sigaction.c (limited to 'sysdeps/unix/sysv/sigaction.c') diff --git a/sysdeps/unix/sysv/sigaction.c b/sysdeps/unix/sysv/sigaction.c new file mode 100644 index 0000000..ebb42cf --- /dev/null +++ b/sysdeps/unix/sysv/sigaction.c @@ -0,0 +1,83 @@ +/* Copyright (C) 1992, 1994, 1995 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include +#include +#include +#include +#include + + +/* If ACT is not NULL, change the action for SIG to *ACT. + If OACT is not NULL, put the old action for SIG in *OACT. */ +int +DEFUN(__sigaction, (sig, act, oact), + int sig AND CONST struct sigaction *act AND struct sigaction *oact) +{ + sighandler_t handler; + int save; + + if (sig <= 0 || sig >= NSIG) + { + errno = EINVAL; + return -1; + } + + if (act == NULL) + { + if (oact == NULL) + return 0; + /* Race condition, but this is the only way to do it. */ + handler = signal (sig, SIG_IGN); + if (handler == SIG_ERR) + return -1; + save = errno; + (void) signal (sig, handler); + errno = save; + } + else + { + int i; + + if (act->sa_flags != 0) + { + unimplemented: + errno = ENOSYS; + return -1; + } + + for (i = 1; i < NSIG; ++i) + if (__sigismember (&act->sa_mask, i)) + goto unimplemented; + + handler = signal (sig, act->sa_handler); + if (handler == SIG_ERR) + return -1; + } + + if (oact != NULL) + { + oact->sa_handler = handler; + __sigemptyset (&oact->sa_mask); + oact->sa_flags = 0; + } + + return 0; +} + +weak_alias (__sigaction, sigaction) -- cgit v1.1