setpgid(2) BSD System Calls Manual setpgid(2)
NAME
setpgid, setpgrp -- set process group
SYNOPSIS
#include <unistd.h>
int
setpgid(pid_t pid, pid_t pgid);
pid_t
setpgrp(void);
DESCRIPTION
Setpgid() sets the process group of the specified process pid to the
specified pgid. 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.
If the calling process is not already a session leader, setpgrp() sets
the process group ID of the calling process to that of the calling
process. Any new session that this creates will have no controlling ter-
minal.
RETURN VALUES
Setpgid() returns 0 when the operation was successful. If the request
failed, -1 is returned and the global variable errno indicates the rea-
son.
ERRORS
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.
[EINVAL] The value of the pgid argument is less than 0 or is
not a value supported by the implementation.
[EPERM] The process indicated by the pid argument is a session
leader.
[EPERM] The effective user ID of the requested process is dif-
ferent from that of the caller and the process is not
a descendant of the calling process.
[EPERM] The value of the pgid argument is valid, but does not
match the process ID of the process indicated by the
pid argument and there is no process with a process
group ID that matches the value of the pgid argument
in the same session as 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.
LEGACY SYNOPSIS
#include <unistd.h>
int
setpgrp(pid_t pid, pid_t pgid);
The legacy setpgrp() function is a clone of the setpgid() function,
retained for calling convention compatibility with historical versions of
BSD.
COMPATIBILITY
Use of the legacy version of the setpgrp() call will cause compiler diag-
nostics. Use setpgid() instead.
Use of private (and conflicting) prototypes for setpgrp() will cause com-
piler diagnostics. Delete the private prototypes and include <unistd.h>.
SEE ALSO
getpgrp(2), compat(5)
STANDARDS
The setpgid() function conforms to IEEE Std 1003.1-1988 (``POSIX.1'').
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution
Mac OS X 10.9.1 - Generated Mon Jan 6 15:16:03 CST 2014