Annotated edit history of
longjmp(3) version 1, including all changes.
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perry |
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LONGJMP |
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!!!LONGJMP |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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RETURN VALUE |
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CONFORMING TO |
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NOTES |
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SEE ALSO |
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---- |
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!!NAME |
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longjmp, siglongjmp - non-local jump to a saved stack context |
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!!SYNOPSIS |
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__#include __ |
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void longjmp(jmp_buf ''env''__, int__ ''val''__); |
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void siglongjmp(sigjmp_buf__ ''env''__, int__ ''val''__); |
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__ |
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!!DESCRIPTION |
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__longjmp()__ and __setjmp()__ are useful for dealing |
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with errors and interrupts encountered in a low-level |
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subroutine of a program. __longjmp()__ restores the |
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environment saved by the last call of __setjmp()__ with |
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the corresponding ''env'' argument. After |
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__longjmp()__ is completed, program execution continues |
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as if the corresponding call of __setjmp()__ had just |
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returned the value ''val''. __longjmp()__ cannot cause |
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0 to be returned. If longjmp is invoked with a second |
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argument of 0, 1 will be returned instead. |
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__siglongjmp()__ is similar to __longjmp()__ except |
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for the type of its ''env'' argument. If the |
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__sigsetjmp()__ call that set this ''env'' used a |
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nonzero ''savesigs'' flag, __siglongjmp()__ also |
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restores the set of blocked signals. |
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!!RETURN VALUE |
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These functions never return. |
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!!CONFORMING TO |
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POSIX |
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!!NOTES |
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POSIX does not specify whether __longjmp__ will restore |
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the signal context. If you want to save and restore signal |
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masks, use __siglongjmp__. |
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__longjmp()__ and __siglongjmp()__ make programs hard |
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to understand and maintain. If possible an alternative |
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should be used. |
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!!SEE ALSO |
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setjmp(3), sigsetjmp(3) |
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---- |
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