lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-28 00:21:52 +03:00
Code Activity

signal: Add __libc_sigaction

Browse Source 
The generic implementation basically handle the system agnostic logic
(filtering out the invalid signals) while the __libc_sigaction is
the function with implements the system and architecture bits.

Checked on x86_64-linux-gnu and i686-linux-gnu.
This commit is contained in:
Adhemerval Zanella
2021-03-15 15:23:40 -03:00
parent d5ddd583da
commit a894053318
14 changed files with 48 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

72
sysdeps/unix/sysv/linux/libc_sigaction.c Normal file
View File

@ -0,0 +1,72 @@
/* Copyright (C) 1997-2021 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
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <sysdep.h>
#include <sys/syscall.h>
/* New ports should not define the obsolete SA_RESTORER, however some
architecture requires for compat mode and/or due old ABI. */
#include <kernel_sigaction.h>
#ifndef SA_RESTORER
# define SET_SA_RESTORER(kact, act)
# define RESET_SA_RESTORER(act, kact)
#endif
/* SPARC passes the restore function as an argument to rt_sigaction. */
#ifndef STUB
# define STUB(act, sigsetsize) (sigsetsize)
#endif
/* 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
__libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
{
int result;
struct kernel_sigaction kact, koact;
if (act)
{
kact.k_sa_handler = act->sa_handler;
memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
kact.sa_flags = act->sa_flags;
SET_SA_RESTORER (&kact, act);
}
/* XXX The size argument hopefully will have to be changed to the
real size of the user-level sigset_t. */
result = INLINE_SYSCALL_CALL (rt_sigaction, sig,
act ? &kact : NULL,
oact ? &koact : NULL, STUB (act,
__NSIG_BYTES));
if (oact && result >= 0)
{
oact->sa_handler = koact.k_sa_handler;
memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
oact->sa_flags = koact.sa_flags;
RESET_SA_RESTORER (oact, &koact);
}
return result;
}
libc_hidden_def (__libc_sigaction)