CRT0(3C)                COMMAND REFERENCE                CRT0(3C)



NAME
     crt0 - C-program startup routine.

SYNOPSIS
     extern int lasterr
     extern char *pgmname

DESCRIPTION
     Crt0 is an object file which contains the startup actions
     for C language programs.  It is loaded by default by the
     compilers.  It builds the argument lists, sets up a pointer
     to the program name, and initializes the global exit code
     (set by ERROR(3c) and used by exit(3c) ), and calls the
     routine exit(3c) explicitly in case it is not called to exit
     the program.

     The global exit code is stored in the variable _last_err.
     This value may be set by user programs in cases where ERROR
     can not be called.

     The variable _pgmname is a pointer to the basename of the
     name of the program being executed.  This value may be used
     in order to find out what name the program was called by.

CAVEATS
     The variable _pgmname is a pointer into the first element of
     the argument list. Programs that change the value of the
     first element of the argument list may trash the name of the
     program, making messages from ERROR contain garbage.

SEE ALSO
     cc(1), ld(1), ERROR(3c), and exit(3c).























Printed 5/12/88                                                 1

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de:862,982;
ca:1844,355;
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