BSD 2.11 - man page for setpgrp (bsd section 2)
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setpgrp - set process group
int pid, pgrp;
Setpgrp sets the process group of the specified process pid to the specified pgrp. If pid
is zero, then the call applies to the current process.
If the invoker is not the super-user, then the affected process must have the same effec-
tive user-id as the invoker or be a descendant of the invoking process.
Setpgrp returns when the operation was successful. If the request failed, -1 is returned
and the global variable errno indicates the reason.
Setpgrp will fail and the process group will not be altered if one of the following occur:
[ESRCH] The requested process does not exist.
[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.
4th Berkeley Distribution May 9, 1985 SETPGRP(2)
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