vms-process man page on DigitalUNIX

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Digital UNIX Diffs - vms-process(5)	   Digital UNIX Diffs - vms-process(5)

       vms-process -  OpenVMS Process Model Differences

       OpenVMS	and UNIX both support the concept of processes, however, there
       are some major differences in their  implementations.   Each  operating
       system  allows  a user to run multiple concurrent processes by spawning
       in OpenVMS and forking in Digital UNIX.	The new process	 is  called  a
       subprocess in OpenVMS and a child in Digital UNIX.  Process creation in
       Digital UNIX is considerably quicker since the child process is	simply
       a  copy	of  the	 parent process.  A second step (an exec) is needed to
       change the program image that the child runs.  On OpenVMS process  cre‐
       ation includes the loading of a new program image.

       To support writing applications that run on both UNIX systems and Open‐
       VMS, the OpenVMS runtime libraries include functions that support  many
       of UNIX C and system services.  Due to differences in process models, a
       number of the functions related to process creation and management have
       semantic differences.  The category vms-process(5) describes these dif‐

       Functions:  abort(5), atexit(5), creat(5), kill(5),  exit(5),  open(5),
       system(5), vfork(5), exec(5), _exit(5), execl(5), execle(5), execlp(5),
       execv(5), execve(5), execvp(5), fopen(5), freopen(5), fdopen(5)


       delim off

					   Digital UNIX Diffs - vms-process(5)

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