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SETPGID(2) BSD System Calls Manual SETPGID(2)
setpgid, setpgrp -- set process group
setpgid(pid_t pid, pid_t pgrp);
setpgrp(pid_t pid, pid_t pgrp);
Setpgid() 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 effective
user-id as the invoker or be a descendant of the invoking process.
Setpgid() returns 0 when the operation was successful. If the request failed, -1 is
returned and the global variable errno indicates the reason.
Setpgid() will fail and the process group will not be altered if:
[EACCES] The value of the pid argument matches the process ID of a child process
of the calling process, and the child process has successfully executed
one of the exec functions.
[EPERM] The effective user ID of the requested process is different from that of
the caller and the process is not a descendant of the calling process.
[ESRCH] The value of the pid argument does not match the process ID of the call-
ing process or of a child process of the calling process.
The setpgid() function conforms to IEEE Std 1003.1-1988 (``POSIX.1'').
Setpgrp() is identical to setpgid(), and is retained for calling convention compatibility
with historical versions of BSD.
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution
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