getpid(2)                 SYSTEM CALLS                  getpid(2)



NAME
     getpid, getpgrp, getppid, getpgid  -  get  process,  process
     group, and parent process IDs

SYNOPSIS
     #include <sys/types.h>
     #include <unistd.h>

     pidt getpid(void);

     pidt getpgrp(void);

     pidt getppid(void);

     pidt getpgid(pidt pid);

DESCRIPTION
     getpid returns the process ID of the calling process.

     getpgrp returns the process group ID of the calling process.

     getppid returns the parent process ID of  the  calling  pro-
     cess.

     getpgid returns the process group ID of  the  process  whose
     process  ID  is equal to pid, or the process group ID of the
     calling process, if pid is equal to zero.

     getpgid will fail if one or more of the following is true:

     EPERM          The process whose process ID is equal to  pid
                    is  not  in  the  same session as the calling
                    process,  and  the  implementation  does  not
                    allow  access to the process group ID of that
                    process from the calling process.

     ESRCH          There is no process with a process  ID  equal
                    to pid.

SEE ALSO
     exec(2),   fork(2),    getpid(2),    getsid(2),    intro(2),
     setpgid(2), setsid(2) setpgrp(2), signal(2).

DIAGNOSTICS
     Upon successful completion, getpgid returns a process  group
     ID.  Otherwise,  a value of (pidt) -1 is returned and errno
     is set to indicate the error.








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