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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

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