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OpenSolaris 2009.06 - man page for getpgrp (opensolaris section 2)

getpid(2)				   System Calls 				getpid(2)

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

SYNOPSIS
       #include <unistd.h>

       pid_t getpid(void);

       pid_t getpgrp(void);

       pid_t getppid(void);

       pid_t getpgid(pid_t pid);

DESCRIPTION
       The getpid() function returns the process ID of the calling process.

       The getpgrp() function returns the process group ID of the calling process.

       The getppid() function returns the parent process ID of the calling process.

       The  getpgid()  function  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 0.

RETURN VALUES
       The getpid(), getpgrp(), and getppid() functions are always successful and no return value
       is reserved to indicate an error.

       Upon  successful  completion, getpgid() returns the process group ID. Otherwise, getpgid()
       returns (pid_t)-1 and sets errno to indicate the error.

ERRORS
       The getpgid() function will fail if:

       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.

       The getpgid() function may fail if:

       EINVAL	 The value of the pid argument is invalid.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO
       Intro(2), exec(2), fork(2),  getsid(2),	setpgid(2),  setpgrp(2),  setsid(2),  signal(3C),
       attributes(5), standards(5)

SunOS 5.11				   27 Jan 2009					getpid(2)


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