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Annotation of coherent/a/usr/man/ALL/main, revision 1.1

1.1     ! root        1: 
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        !             3: main()                      C Language                     main()
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        !             8: Introduce program's main function
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        !            11: A C program consists of a  set of functions, one of which must be
        !            12: called main.   This function is  called from the  runtime startup
        !            13: routine after the runtime environment has been initialized.
        !            14: 
        !            15: Programs can terminate in one of two ways.  The easiest is simply
        !            16: to have the main  routine return.  Control returns to the runtime
        !            17: startup; it closes all open file streams and otherwise cleans up,
        !            18: and then returns control  to the operating system, passing it the
        !            19: value returned by main as exit status.
        !            20: 
        !            21: In some situations (errors,  for example), it may be necessary to
        !            22: stop a  program, and you may  not want to return  to main.  Here,
        !            23: you can  use exit;  it cleans  up the debris  left by  the broken
        !            24: program and returns control directly to the operating system.
        !            25: 
        !            26: A second  exit routine, called _exit,  quickly returns control to
        !            27: the  operating  system  without  performing  any  cleanup.   This
        !            28: routine should  be used with care,  because bypassing the cleanup
        !            29: will leave files open and buffers of data in memory.
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        !            31: Programs compiled  by COHERENT return to  the program that called
        !            32: them; if they  return from main with a value  or call exit with a
        !            33: value, that value is returned to their caller.  Programs that in-
        !            34: voke  other  programs  through  the  ssyysstteemm  function  check  the
        !            35: returned value to see if these secondary programs terminated suc-
        !            36: cessfully.
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        !            38: ***** See Also *****
        !            39: 
        !            40: _exit, argc, argv, C language, envp, exit
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        !            64: COHERENT Lexicon                                           Page 1
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