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1 perry 1 SETJMP
2 !!!SETJMP
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 RETURN VALUE
7 CONFORMING TO
8 NOTES
9 SEE ALSO
10 ----
11 !!NAME
12
13
14 setjmp, sigsetjmp - save stack context for non-local goto
15 !!SYNOPSIS
16
17
18 __#include __
19
20
21 int setjmp(jmp_buf ''env''__);
22 int sigsetjmp(sigjmp_buf__ ''env''__, int__ ''savesigs''__);
23 __
24 !!DESCRIPTION
25
26
27 __setjmp()__ and __longjmp()__ are useful for dealing
28 with errors and interrupts encountered in a low-level
29 subroutine of a program. __setjmp()__ saves the stack
30 context/environment in ''env'' for later use by
31 __longjmp()__. The stack context will be invalidated if
32 the function which called __setjmp()__
33 returns.
34
35
36 __sigsetjmp()__ is similar to __setjmp()__. If
37 ''savesigs'' is nonzero, the set of blocked signals is
38 saved in ''env'' and will be restored if a
39 __siglongjmp()__ is later performed with this
40 ''env''.
41 !!RETURN VALUE
42
43
44 __setjmp()__ and __sigsetjmp()__ return 0 if returning
45 directly, and non-zero when returning from __longjmp()__
46 using the saved context.
47 !!CONFORMING TO
48
49
50 POSIX, ISO 9899
51 !!NOTES
52
53
54 POSIX does not specify whether __setjmp__ will save the
55 signal context. (In SYSV it will not. In BSD4.3 it will, and
56 there is a function ___setjmp__ that will not.) If you
57 want to save signal masks, use
58 __sigsetjmp__.
59
60
61 __setjmp()__ and __sigsetjmp__ make programs hard to
62 understand and maintain. If possible an alternative should
63 be used.
64 !!SEE ALSO
65
66
67 longjmp(3), siglongjmp(3)
68 ----
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