int
setpgid(
pid_t pid
, pid_t pgrp
)
int
setpgrp(
pid_t pid
, pid_t pgrp
)
)
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
pgrp
is zero, then the process id of the process specified by
pid
is used instead.
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.
)
returns 0 when the operation was successful.
If the request failed, -1 is returned and the global variable
errno
indicates the reason.
)
will fail and the process group will not be altered if:
EACCES
]
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
]
pgrp
argument is less than zero.
EPERM
]
ESRCH
]
pid
argument does not match the process ID of the calling process or of a
child process of the calling process.
)
function conforms to
ISO/IEC 9945-1:1990 (``POSIX.1'') .
)
is identical to
setpgid(
),
and is retained for calling convention compatibility with historical
versions of
BSD.