1 .\" Written by Michael Haardt, Fri Nov 25 14:51:42 MET 1994
3 .\" %%%LICENSE_START(GPLv2+_DOC_FULL)
4 .\" This is free documentation; you can redistribute it and/or
5 .\" modify it under the terms of the GNU General Public License as
6 .\" published by the Free Software Foundation; either version 2 of
7 .\" the License, or (at your option) any later version.
9 .\" The GNU General Public License's references to "object code"
10 .\" and "executables" are to be interpreted as the output of any
11 .\" document formatting or typesetting system, including
12 .\" intermediate and printed output.
14 .\" This manual is distributed in the hope that it will be useful,
15 .\" but WITHOUT ANY WARRANTY; without even the implied warranty of
16 .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 .\" GNU General Public License for more details.
19 .\" You should have received a copy of the GNU General Public
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21 .\" <http://www.gnu.org/licenses/>.
24 .\" Added sigsetjmp, Sun Mar 2 22:03:05 EST 1997, jrv@vanzandt.mv.com
25 .\" Modifications, Sun Feb 26 14:39:45 1995, faith@cs.unc.edu
27 .TH SETJMP 3 2014-01-07 "" "Linux Programmer's Manual"
29 setjmp, sigsetjmp \- save stack context for nonlocal goto
31 .B #include <setjmp.h>
34 .BI "int setjmp(jmp_buf " env );
36 .BI "int sigsetjmp(sigjmp_buf " env ", int " savesigs );
40 Feature Test Macro Requirements for glibc (see
41 .BR feature_test_macros (7)):
48 _POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE || _POSIX_C_SOURCE
53 are useful for dealing with errors
54 and interrupts encountered in a low-level subroutine of a program.
56 saves the stack context/environment in
61 The stack context will be invalidated
62 if the function which called
72 the process's current signal mask is saved in
74 and will be restored if a
76 is later performed with this
82 return 0 if returning directly, and
83 nonzero when returning from
87 using the saved context.
89 C89, C99, and POSIX.1-2001 specify
91 POSIX.1-2001 specifies
94 POSIX does not specify whether
96 will save the signal mask
97 (to be later restored during
99 In System V it will not.
100 In 4.3BSD it will, and there
104 On Linux with glibc versions before 2.19,
106 follows the System V behavior by default,
107 but the BSD behavior is provided if the
109 feature test macro is defined and none of
111 .BR _POSIX_C_SOURCE ,
113 .BR _XOPEN_SOURCE_EXTENDED ,
120 exposes only the System V version of
122 Programs that need the BSD semantics should replace calls to
130 If you want to portably save and restore signal masks, use
138 make programs hard to understand
140 If possible an alternative should be used.