NAME
getpgid — get the
process group ID for a process
SYNOPSIS
pid_t getpgid(pid_t pid);
DESCRIPTION
The getpgid () function shall return the
process group ID of the process whose process ID is equal to
pid. If pid is equal to 0,
getpgid () shall return the process group ID of the
calling process.
RETURN VALUE
Upon successful completion, getpgid ()
shall return a process group ID. Otherwise, it shall return (
pid_t)
-1 and set
errno to
indicate the error.
ERRORS
The getpgid () function shall 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.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
exec(3) , fork(3) , getpgrp(3) , getpid(3) , getsid(3) , setpgid(3) , setsid(3) , the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <unistd.h>
CHANGE HISTORY
First released in Issue 4, Version 2.
Issue 5
Moved from X/OPEN UNIX extension to BASE.
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