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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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SIGSETJMP(3P) POSIX Programmer's Manual SIGSETJMP(3P)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
sigsetjmp — set jump point for a non-local goto
#include <setjmp.h>
int sigsetjmp(sigjmp_buf env, int savemask);
The sigsetjmp() function shall be equivalent to the setjmp()
function, except as follows:
* References to setjmp() are equivalent to sigsetjmp().
* References to longjmp() are equivalent to siglongjmp().
* If the value of the savemask argument is not 0, sigsetjmp()
shall also save the current signal mask of the calling thread
as part of the calling environment.
If the return is from a successful direct invocation, sigsetjmp()
shall return 0. If the return is from a call to siglongjmp(),
sigsetjmp() shall return a non-zero value.
No errors are defined.
The following sections are informative.
None.
The distinction between setjmp()/longjmp() and
sigsetjmp()/siglongjmp() is only significant for programs which
use sigaction(), sigprocmask(), or sigsuspend().
Note that since this function is defined in terms of setjmp(), if
savemask is zero, it is unspecified whether the signal mask is
saved.
The ISO C standard specifies various restrictions on the usage of
the setjmp() macro in order to permit implementors to recognize
the name in the compiler and not implement an actual function.
These same restrictions apply to the sigsetjmp() macro.
There are processors that cannot easily support these calls, but
this was not considered a sufficient reason to exclude them.
4.2 BSD, 4.3 BSD, and XSI-conformant systems provide functions
named _setjmp() and _longjmp() that, together with setjmp() and
longjmp(), provide the same functionality as sigsetjmp() and
siglongjmp(). On those systems, setjmp() and longjmp() save and
restore signal masks, while _setjmp() and _longjmp() do not. On
System V Release 3 and in corresponding issues of the SVID,
setjmp() and longjmp() are explicitly defined not to save and
restore signal masks. In order to permit existing practice in both
cases, the relation of setjmp() and longjmp() to signal masks is
not specified, and a new set of functions is defined instead.
The longjmp() and siglongjmp() functions operate as in the
previous issue provided the matching setjmp() or sigsetjmp() has
been performed in the same thread. Non-local jumps into contexts
saved by other threads would be at best a questionable practice
and were not considered worthy of standardization.
None.
pthread_sigmask(3p), siglongjmp(3p), signal(3p), sigsuspend(3p)
The Base Definitions volume of POSIX.1‐2017, setjmp.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics Engineers,
Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard,
the original IEEE and The Open Group Standard is the referee
document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 SIGSETJMP(3P)
Pages that refer to this page: setjmp.h(0p), longjmp(3p), _longjmp(3p), setjmp(3p), sigaltstack(3p), siglongjmp(3p), sleep(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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