[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / i386 / sigaction.c

/* POSIX.1 `sigaction' call for Linux/i386.
Copyright (C) 1991, 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 <sysdep.h>
#include <errno.h>
#include <stddef.h>
#include <signal.h>


/* 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
__sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
{
  struct sigaction newact;
  int result;

  if (act)
    {
      newact = *act;
      newact.sa_restorer = ((act->sa_flags & SA_NOMASK)
			    ? &&restore_nomask : &&restore);
      act = &newact;
    }

  asm volatile ("pushl %%ebx\n"
		"movl %2, %%ebx\n"
		"int $0x80\n"
		"popl %%ebx"
		: "=a" (result)
		: "0" (SYS_ify (sigaction)), "r" (sig), "c" (act), "d" (oact));

  if (result < 0)
    {
      errno = -result;
      return -1;
    }
  return 0;

 restore:
  asm (
#ifdef	PIC
       "	pushl %%ebx\n"
       "	call 0f\n"
       "0:	popl %%ebx\n"
       "	addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %%ebx\n"
       "	addl $8, %%esp\n"
       "	call __sigsetmask@PLT\n"
       "	addl $8, %%esp\n"
       "	popl %%ebx\n"
#else
       "	addl $4, %%esp\n"
       "	call __sigsetmask\n"
       "	addl $4, %%esp\n"
#endif
       "	popl %%eax\n"
       "	popl %%ecx\n"
       "	popl %%edx\n"
       "	popf\n"
       "	ret"
       : : );

 restore_nomask:
  asm ("	addl $4, %%esp\n"
       "	popl %%eax\n"
       "	popl %%ecx\n"
       "	popl %%edx\n"
       "	popf\n"
       "	ret"
       : : );

  /* NOTREACHED */
  return -1;
}

weak_alias (__sigaction, sigaction)
Commit	Line	Data
efc755b2 RM	1	/* POSIX.1 `sigaction' call for Linux/i386.
	2	Copyright (C) 1991, 1995 Free Software Foundation, Inc.
	3	This file is part of the GNU C Library.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Library General Public License as
	7	published by the Free Software Foundation; either version 2 of the
	8	License, or (at your option) any later version.
	9
	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Library General Public License for more details.
	14
	15	You should have received a copy of the GNU Library General Public
	16	License along with the GNU C Library; see the file COPYING.LIB. If
	17	not, write to the Free Software Foundation, Inc., 675 Mass Ave,
	18	Cambridge, MA 02139, USA. */
	19
	20	#include <sysdep.h>
	21	#include <errno.h>
	22	#include <stddef.h>
	23	#include <signal.h>
	24
	25
	26	/* If ACT is not NULL, change the action for SIG to *ACT.
	27	If OACT is not NULL, put the old action for SIG in OACT. /
	28	int
	29	__sigaction (int sig, const struct sigaction act, struct sigaction oact)
	30	{
	31	struct sigaction newact;
	32	int result;
	33
3e2ee727	34	if (act)
efc755b2	35	{
3e2ee727 RM	36	newact = *act;
	37	newact.sa_restorer = ((act->sa_flags & SA_NOMASK)
	38	? &&restore_nomask : &&restore);
	39	act = &newact;
efc755b2 RM	40	}
	41
	42	asm volatile ("pushl %%ebx\n"
3e2ee727	43	"movl %2, %%ebx\n"
efc755b2 RM	44	"int $0x80\n"
	45	"popl %%ebx"
	46	: "=a" (result)
3bbceb12	47	: "0" (SYS_ify (sigaction)), "r" (sig), "c" (act), "d" (oact));
efc755b2 RM	48
	49	if (result < 0)
	50	{
	51	errno = -result;
	52	return -1;
	53	}
	54	return 0;
	55
	56	restore:
	57	asm (
	58	#ifdef PIC
3e2ee727	59	" pushl %%ebx\n"
efc755b2	60	" call 0f\n"
3e2ee727 RM	61	"0: popl %%ebx\n"
3e2ee727 RM	62	" addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %%ebx\n"
efc755b2 RM	63	" addl $8, %%esp\n"
	64	" call __sigsetmask@PLT\n"
	65	" addl $8, %%esp\n"
3e2ee727	66	" popl %%ebx\n"
efc755b2 RM	67	#else
	68	" addl $4, %%esp\n"
	69	" call __sigsetmask\n"
	70	" addl $4, %%esp\n"
	71	#endif
3e2ee727 RM	72	" popl %%eax\n"
	73	" popl %%ecx\n"
	74	" popl %%edx\n"
	75	" popf\n"
	76	" ret"
	77	: : );
3bbceb12	78
efc755b2	79	restore_nomask:
3e2ee727 RM	80	asm (" addl $4, %%esp\n"
	81	" popl %%eax\n"
	82	" popl %%ecx\n"
	83	" popl %%edx\n"
	84	" popf\n"
	85	" ret"
	86	: : );
3bbceb12	87
3e2ee727	88	/* NOTREACHED */
3bbceb12	89	return -1;
efc755b2 RM	90	}
	91
	92	weak_alias (__sigaction, sigaction)