LDP
/
man-pages
mirror of https://github.com/mkerrisk/man-pages
0
1
Fork 0
Code Releases Activity

setjmp.3: Clarify when setjmp() provides BSD vs System V signal mask semantics 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2009-01-13 16:52:46 +13:00
parent 1192ed9476
commit e739a26839
1 changed files with 18 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
man3/setjmp.3
View File

@ -40,6 +40,9 @@ Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
.sp
.BR setjmp ():
see NOTES.
.br
.BR sigsetjmp ():
_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE || _POSIX_C_SOURCE
.SH DESCRIPTION
@ -82,9 +85,22 @@ POSIX.1-2001 specifies
POSIX does not specify whether
.BR setjmp ()
will save the signal signal mask.
(In System V it will not.
In System V it will not.
In 4.3BSD it will, and there
is a function \fB_setjmp\fP that will not.)
is a function \fB_setjmp\fP that will not.
By default, Linux/glibc follows the System V behavior,
but the BSD behavior is provided if the
.BR _BSD_SOURCE
feature test macro is defined and none of
.BR _POSIX_SOURCE ,
.BR _POSIX_C_SOURCE ,
.BR _XOPEN_SOURCE ,
.BR _XOPEN_SOURCE_EXTENDED ,
.BR _GNU_SOURCE ,
or
.B _SVID_SOURCE
is defined.
If you want to portably save and restore signal masks, use
.BR sigsetjmp ()
and