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sigsetjmp(3p) — Linux manual page

SIGSETJMP(3P)           POSIX Programmer's ManualSIGSETJMP(3P)

PROLOG        top

       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.

NAME        top

       sigsetjmp — set jump point for a non-local goto

SYNOPSIS        top

       #include <setjmp.h>       int sigsetjmp(sigjmp_bufenv, intsavemask);

DESCRIPTION        top

       Thesigsetjmp() function shall be equivalent to thesetjmp()       function, except as follows:        *  References tosetjmp() are equivalent tosigsetjmp().        *  References tolongjmp() are equivalent tosiglongjmp().        *  If the value of thesavemask argument is not 0,sigsetjmp()           shall also save the current signal mask of the calling thread           as part of the calling environment.

RETURN VALUE        top

       If the return is from a successful direct invocation,sigsetjmp()       shall return 0. If the return is from a call tosiglongjmp(),sigsetjmp() shall return a non-zero value.

ERRORS        top

       No errors are defined.The following sections are informative.

EXAMPLES        top

       None.

APPLICATION USAGE        top

       The distinction betweensetjmp()/longjmp() andsigsetjmp()/siglongjmp() is only significant for programs which       usesigaction(),sigprocmask(), orsigsuspend().       Note that since this function is defined in terms ofsetjmp(), ifsavemask is zero, it is unspecified whether the signal mask is       saved.

RATIONALE        top

       The ISO C standard specifies various restrictions on the usage of       thesetjmp() macro in order to permit implementors to recognize       the name in the compiler and not implement an actual function.       These same restrictions apply to thesigsetjmp() 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 withsetjmp() andlongjmp(), provide the same functionality assigsetjmp() andsiglongjmp().  On those systems,setjmp() andlongjmp() save and       restore signal masks, while_setjmp() and_longjmp() do not. On       System V Release 3 and in corresponding issues of the SVID,setjmp() andlongjmp() are explicitly defined not to save and       restore signal masks. In order to permit existing practice in both       cases, the relation ofsetjmp() andlongjmp() to signal masks is       not specified, and a new set of functions is defined instead.       Thelongjmp() andsiglongjmp() functions operate as in the       previous issue provided the matchingsetjmp() orsigsetjmp() 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.

FUTURE DIRECTIONS        top

       None.

SEE ALSO        top

pthread_sigmask(3p),siglongjmp(3p),signal(3p),sigsuspend(3p)       The Base Definitions volume of POSIX.1‐2017,setjmp.h(0p)

COPYRIGHT        top

       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 athttp://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, seehttps://www.kernel.org/doc/man-pages/reporting_bugs.html .IEEE/The Open Group                2017SIGSETJMP(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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