setpgid, setpgrp - set process group
Standard C Library (libc, -lc)
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
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
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
[EINVAL] The value of the pgrp argument is less than zero.
[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 calling process or of a child process
of the calling process.
The setpgid() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').
setpgrp() is identical to setpgid(), and is retained for calling convention
compatibility with historical versions of BSD.
BSD June 4, 1993 BSD
[ Back ]