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36 .\" @(#)setjmp.3 8.1 (Berkeley) 6/4/93
37 .\" $FreeBSD: src/lib/libc/gen/setjmp.3,v 1.5.2.5 2003/03/15 15:11:05 trhodes Exp $
38 .\" $DragonFly: src/lib/libc/gen/setjmp.3,v 1.2 2003/06/17 04:26:42 dillon Exp $
57 .Fn sigsetjmp "sigjmp_buf env" "int savemask"
59 .Fn siglongjmp "sigjmp_buf env" "int val"
61 .Fn setjmp "jmp_buf env"
63 .Fn longjmp "jmp_buf env" "int val"
65 .Fn _setjmp "jmp_buf env"
67 .Fn _longjmp "jmp_buf env" "int val"
76 functions save their calling environment in
78 Each of these functions returns 0.
82 functions restore the environment saved by their most recent respective
87 They then return so that program execution continues as if the corresponding
90 call had just returned the value specified by
94 Pairs of calls may be intermixed, i.e. both
102 combinations may be used in the same program, however, individual
103 calls may not, e.g. the
112 routines may not be called after the routine which called the
116 All accessible objects have values as of the time
118 routine was called, except that the values of objects of automatic storage
119 invocation duration that do not have the
121 type and have been changed between the
125 call are indeterminate.
128 .Fn setjmp Ns / Ns Fn longjmp
129 pairs save and restore the signal mask while
130 .Fn _setjmp Ns / Ns Fn _longjmp
131 pairs save and restore only the register set and the stack.
133 .Fn sigprocmask 2 . )
136 .Fn sigsetjmp Ns / Ns Fn siglongjmp
138 pairs save and restore the signal mask if the argument
140 is non-zero, otherwise only the register set and the stack are saved.
142 If the contents of the
144 are corrupted, or correspond to an environment that has already returned,
147 routine calls the routine
151 returns the program is aborted (see
153 The default version of
157 to standard error and returns.
158 User programs wishing to exit more gracefully should write their own