1 /* Copyright (C) 1998, 2000, 2005 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include <string.h> /* For the real memset prototype. */
26 /* Set the disposition for SIG. */
32 struct sigaction act
, oact
;
36 /* Handle SIG_HOLD first. */
39 /* Create an empty signal set. */
40 if (__sigemptyset (&set
) < 0)
43 /* Add the specified signal. */
44 if (__sigaddset (&set
, sig
) < 0)
47 /* Add the signal set to the current signal mask. */
48 if (__sigprocmask (SIG_BLOCK
, &set
, NULL
) < 0)
55 /* Check signal extents to protect __sigismember. */
56 if (disp
== SIG_ERR
|| sig
< 1 || sig
>= NSIG
)
62 act
.sa_handler
= disp
;
63 if (__sigemptyset (&act
.sa_mask
) < 0)
66 if (__sigaction (sig
, &act
, &oact
) < 0)
69 /* Create an empty signal set. */
70 if (__sigemptyset (&set
) < 0)
73 /* Add the specified signal. */
74 if (__sigaddset (&set
, sig
) < 0)
77 /* Remove the signal set from the current signal mask. */
78 if (__sigprocmask (SIG_UNBLOCK
, &set
, NULL
) < 0)
81 return oact
.sa_handler
;