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.\" the American National Standards Committee X3, on Information
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.\" @(#)setjmp.3 6.8 (Berkeley) 7/30/91
.Nm _longjmp longjmperror
.Fn sigsetjmp "sigjmp_buf env" "int savemask"
.Fn siglongjmp "sigjmp_buf env" "int val"
.Fn longjmp "jmp_buf env" "int val"
.Fn _setjmp "jmp_buf env"
.Fn _longjmp "jmp_buf env" "int val"
functions save their calling environment in
Each of these functions returns 0.
functions restore the environment saved by their most recent respective
They then return so that program execution continues as if the corresponding
call had just returned the value specified by
Pairs of calls may be intermixed, i.e. both
combinations may be used in the same program, however, individual
routines may not be called after the routine which called the
All accessible objects have values as of the time
routine was called, except that the values of objects of automatic storage
invocation duration that do not have the
type and have been changed between the
.Fn setjmp Ns / Ns Fn longjmp
pairs save and restore the signal mask while
.Fn _setjmp Ns / Ns Fn _longjmp
pairs save and restore only the register set and the stack.
.Fn sigsetjmp Ns / Ns Fn siglongjmp
pairs save and restore the signal mask if the argument
is non-zero, otherwise only the register set and the stack are saved.
are corrupted, or correspond to an environment that has already returned,
routine calls the routine
returns the program is aborted (see
to standard error and returns.
User programs wishing to exit more gracefully should write their own