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Annotation of coherent/a/usr/man/COHERENT/fork, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: fork()                 COHERENT System Call                fork()
        !             4: 
        !             5: 
        !             6: 
        !             7: 
        !             8: Create a new process
        !             9: 
        !            10: fork()
        !            11: 
        !            12: In  the COHERENT  system,  many processes  may  be active  simul-
        !            13: taneously.   fork creates  a new  process; the  new process  is a
        !            14: duplicate  of  the  requesting  process.   In practice,  the  new
        !            15: process often issues a call to execute yet another new program.
        !            16: 
        !            17: The  process  that issues  the  fork call  is  termed the  parent
        !            18: process,  and  the  newly  forked  process  is termed  the  child
        !            19: process.  fork returns the  process id of the newly created child
        !            20: to the  parent process,  and returns  zero to the  child process.
        !            21: The parent  may call wait to suspend itself  until the child ter-
        !            22: minates.
        !            23: 
        !            24: The following  parts of the environment of  a process are exactly
        !            25: duplicated by a fork call:
        !            26: 
        !            27: *  Open files and their seek positions
        !            28: 
        !            29: *  Current working and root directories
        !            30: 
        !            31: *  The file creation mask
        !            32: 
        !            33: *  The values of all signals
        !            34: 
        !            35: *  The alarm clock setting
        !            36: 
        !            37: *  Code, data, and stack segments
        !            38: 
        !            39: The system  normally makes  a fresh copy  of the code,  data, and
        !            40: stack segments  for the child  process.  One advantage  of shared
        !            41: text processes is that they do not need to copy the code segment.
        !            42: It is write protected, and therefore may be shared.
        !            43: 
        !            44: ***** Example *****
        !            45: 
        !            46: For an example of how to use this call, see pipe.
        !            47: 
        !            48: ***** See Also *****
        !            49: 
        !            50: alarm(),  COHERENT system  calls, execl(),  exit(),  sh, umask(),
        !            51: wait()
        !            52: 
        !            53: ***** Diagnostics *****
        !            54: 
        !            55: fork returns  -1 on failure, which  usually involves insufficient
        !            56: system resources.  On  successful calls, fork returns zero to the
        !            57: child and the process id of the child to the parent.
        !            58: 
        !            59: 
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        !            62: 
        !            63: 
        !            64: COHERENT Lexicon                                           Page 1
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