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setjmp(3) [v7 man page]

SETJMP(3)						     Library Functions Manual							 SETJMP(3)

NAME
setjmp, longjmp - non-local goto SYNOPSIS
#include <setjmp.h> setjmp(env) jmp_buf env; longjmp(env, val) jmp_buf env; DESCRIPTION
These routines are useful for dealing with errors and interrupts encountered in a low-level subroutine of a program. Setjmp saves its stack environment in env for later use by longjmp. It returns value 0. Longjmp restores the environment saved by the last call of setjmp. It then returns in such a way that execution continues as if the call of setjmp had just returned the value val to the function that invoked setjmp, which must not itself have returned in the interim. All accessible data have values as of the time longjmp was called. SEE ALSO
signal(2) SETJMP(3)

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SETJMP(3)							 Library functions							 SETJMP(3)

NAME
setjmp, sigsetjmp - save stack context for non-local goto SYNOPSIS
#include <setjmp.h> int setjmp(jmp_buf env); int sigsetjmp(sigjmp_buf env, int savesigs); DESCRIPTION
setjmp() and longjmp() are useful for dealing with errors and interrupts encountered in a low-level subroutine of a program. setjmp() saves the stack context/environment in env for later use by longjmp(). The stack context will be invalidated if the function which called setjmp() returns. sigsetjmp() is similar to setjmp(). If savesigs is nonzero, the set of blocked signals is saved in env and will be restored if a sig- longjmp() is later performed with this env. RETURN VALUE
setjmp() and sigsetjmp() return 0 if returning directly, and non-zero when returning from longjmp() using the saved context. CONFORMING TO
POSIX, ISO 9899 (C99) NOTES
POSIX does not specify whether setjmp will save the signal context. (In SYSV it will not. In BSD4.3 it will, and there is a function _setjmp that will not.) If you want to save signal masks, use sigsetjmp. setjmp() and sigsetjmp make programs hard to understand and maintain. If possible an alternative should be used. SEE ALSO
longjmp(3), siglongjmp(3) 1997-03-02 SETJMP(3)
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