diff options
Diffstat (limited to 'REORG.TODO/sysdeps/posix/sigset.c')
-rw-r--r-- | REORG.TODO/sysdeps/posix/sigset.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/posix/sigset.c b/REORG.TODO/sysdeps/posix/sigset.c new file mode 100644 index 0000000000..a4dfe0ae93 --- /dev/null +++ b/REORG.TODO/sysdeps/posix/sigset.c @@ -0,0 +1,75 @@ +/* Copyright (C) 1998-2017 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 Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#define __need_NULL +#include <stddef.h> +#include <signal.h> +#include <string.h> /* For the real memset prototype. */ +#include <sigsetops.h> + +/* Set the disposition for SIG. */ +__sighandler_t +sigset (int sig, __sighandler_t disp) +{ + struct sigaction act; + struct sigaction oact; + sigset_t set; + sigset_t oset; + + /* Check signal extents to protect __sigismember. */ + if (disp == SIG_ERR || sig < 1 || sig >= NSIG) + { + __set_errno (EINVAL); + return SIG_ERR; + } + + __sigemptyset (&set); + __sigaddset (&set, sig); + + if (disp == SIG_HOLD) + { + /* Add the signal to the current signal mask. */ + if (__sigprocmask (SIG_BLOCK, &set, &oset) < 0) + return SIG_ERR; + + /* If the signal was already blocked signal this to the caller. */ + if (__sigismember (&oset, sig)) + return SIG_HOLD; + + /* We need to determine whether a specific handler is installed. */ + if (__sigaction (sig, NULL, &oact) < 0) + return SIG_ERR; + + return oact.sa_handler; + } + else + { + act.sa_handler = disp; + __sigemptyset (&act.sa_mask); + act.sa_flags = 0; + if (__sigaction (sig, &act, &oact) < 0) + return SIG_ERR; + + /* Remove the signal from the current signal mask. */ + if (__sigprocmask (SIG_UNBLOCK, &set, &oset) < 0) + return SIG_ERR; + + /* If the signal was already blocked return SIG_HOLD. */ + return __sigismember (&oset, sig) ? SIG_HOLD : oact.sa_handler; + } +} |