SETJMP(3) BSD Library Functions Manual SETJMP(3)

NAME
     ssiiggsseettjjmmpp, ssiigglloonnggjjmmpp, sseettjjmmpp, lloonnggjjmmpp, sseettjjmmpp, lloonnggjjmmpp, lloonnggjjmmppeerrrroorr
     - non-local jumps

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

     int
     ssiiggsseettjjmmpp(sigjmpbuf env, int savemask);

     void
     ssiigglloonnggjjmmpp(sigjmpbuf env, int val);

     int
     sseettjjmmpp(jmpbuf env);

     void
     lloonnggjjmmpp(jmpbuf env, int val);

     int
     sseettjjmmpp(jmpbuf env);

     void
     lloonnggjjmmpp(jmpbuf env, int val);

     void
     lloonnggjjmmppeerrrroorr(void);

DESCRIPTION
     The ssiiggsseettjjmmpp(), sseettjjmmpp(), and sseettjjmmpp() functions save their calling
     environment in env.  Each of these functions returns 0.

     The corresponding lloonnggjjmmpp() functions restore the environment saved by
     their most recent respective invocations of the sseettjjmmpp() function.  They
     then return so that program execution continues as if the corresponding
     invocation of the sseettjjmmpp() call had just returned  the value specified by
     val, instead of 0.

     Pairs of calls may be intermixed, i.e. both ssiiggsseettjjmmpp() and ssiigglloonnggjjmmpp()
     and sseettjjmmpp() and lloonnggjjmmpp() combinations may be used in the same program,
     however, individual calls may not, e.g. the env argument to sseettjjmmpp() may
     not be passed to ssiigglloonnggjjmmpp().

     The lloonnggjjmmpp() routines may not be called after the routine which called
     the sseettjjmmpp() routines returns.

     All accessible objects have values as of the time lloonnggjjmmpp() routine was
     called, except that the values of objects of automatic storage invocation
     duration that do not have the volatile type and have been changed between
     the sseettjjmmpp() invocation and lloonnggjjmmpp() call are indeterminate.

     The sseettjjmmpp()/lloonnggjjmmpp() pairs save and restore the signal mask while
     sseettjjmmpp()/lloonnggjjmmpp() pairs save and restore only the register set and the
     stack.  (See ssiiggpprrooccmmaasskk(2).)

     The ssiiggsseettjjmmpp()/ssiigglloonnggjjmmpp() function pairs save and restore the signal
     mask if the argument savemask is non-zero, otherwise only the register
     set and the stack are saved.

EERRRROORRSS
     If the contents of the env are corrupted, or correspond to an environment
     that has already returned, the lloonnggjjmmpp() routine calls the routine
     lloonnggjjmmppeerrrroorr(3).  If lloonnggjjmmppeerrrroorr() returns the program is aborted (see
     abort(3)).  The default version of lloonnggjjmmppeerrrroorr() prints the message
     ``longjmp botch'' to standard error and returns.  User programs wishing
     to exit more gracefully should write their own versions of
     lloonnggjjmmppeerrrroorr().

SEE ALSO
     sigaction(2), sigaltstack(2), signal(3)

STANDARDS     The sseettjjmmpp() and lloonnggjjmmpp() functions conform to ISO/IEC 9899:1990
     (``ISO C90'').  The ssiiggsseettjjmmpp() and ssiigglloonnggjjmmpp() functions conform to
     IEEE Std 1003.1-1988 (``POSIX.1'').

BSD                              June 4, 1993                              BSD