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Annotation of coherent/a/usr/man/ALL/main, revision 1.1.1.1

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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.
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                     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.
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                     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.
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                     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 *****
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                     40: _exit, argc, argv, C language, envp, exit
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                     64: COHERENT Lexicon                                           Page 1
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