setpgrp(2)
Name
setpgrp − set process group
Syntax
setpgrp(pid, pgrp)
int pid, pgrp;
Description
The setpgrp system call sets the process group of the specified process pid to the specified pgrp. If pid is zero, the call applies to the current process.
If the invoker is not the superuser, the affected process must either have the same effective user-id as the invoker or be a descendant of the invoking process.
Return Values
The setpgrp system call returns zero (0) when the operation is successful. If the request fails, −1 is returned, and the global variable errno indicates the reason.
Environment
SYSTEM_FIVE
When your program is compiled using the System V environment, setpgrp is called without arguments and the new process group id is returned if successful.
Diagnostics
The setpgrp system call fails and the process group is not altered, if one of the following occur:
[EPERM] The effective user ID of the requested process is different from that of the caller and the process is not a descendent of the calling process.
[ESRCH] The requested process does not exist.