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32 .\" @(#)setjmp.3 8.1 (Berkeley) 6/4/93
52 .Fn sigsetjmp "sigjmp_buf env" "int savemask"
54 .Fn siglongjmp "sigjmp_buf env" "int val"
56 .Fn setjmp "jmp_buf env"
58 .Fn longjmp "jmp_buf env" "int val"
60 .Fn _setjmp "jmp_buf env"
62 .Fn _longjmp "jmp_buf env" "int val"
71 functions save their calling environment in
73 Each of these functions returns 0.
77 functions restore the environment saved by their most recent respective
82 They then return so that program execution continues as if the corresponding
85 call had just returned the value specified by
89 Pairs of calls may be intermixed, i.e., both
97 combinations may be used in the same program, however, individual
98 calls may not, e.g.\& the
107 routines may not be called after the routine which called the
111 All accessible objects have values as of the time
113 routine was called, except that the values of objects of automatic storage
114 invocation duration that do not have the
116 type and have been changed between the
120 call are indeterminate.
123 .Fn setjmp Ns / Ns Fn longjmp
124 pairs save and restore the signal mask while
125 .Fn _setjmp Ns / Ns Fn _longjmp
126 pairs save and restore only the register set and the stack.
128 .Fn sigprocmask 2 . )
131 .Fn sigsetjmp Ns / Ns Fn siglongjmp
133 pairs save and restore the signal mask if the argument
135 is non-zero, otherwise only the register set and the stack are saved.
137 If the contents of the
139 are corrupted, or correspond to an environment that has already returned,
142 routine calls the routine
146 returns the program is aborted (see
148 The default version of
152 to standard error and returns.
153 User programs wishing to exit more gracefully should write their own