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    SETPGID(2)          Linux Programmer's Manual          SETPGID(2)

    NAME
           setpgid, getpgid, setpgrp, getpgrp - set/get process group

    SYNOPSIS
           #include <unistd.h>

           int setpgid(pid_t pid, pid_t pgid);
           pid_t getpgid(pid_t pid);
           int setpgrp(void);
           pid_t getpgrp(void);

    DESCRIPTION
           setpgid sets the process group ID of the process specified
           by  pid  to  pgid.   If pid is zero, the process ID of the
           current process is used.  If pgid is zero, the process  ID
           of the process specified by pid is used.

           getpgid returns the process group ID of the process speci-
           fied by pid.  If pid is zero, the process ID of  the  cur-
           rent process is used.

           In  the  Linux  DLL  4.4.1  library,  setpgrp simply calls
           setpgid(0,0).

           getpgrp is equivalent to getpgid(0).

           Process groups are used for distribution of  signals,  and
           by  terminals  to arbitrate requests for their input: pro-
           cesses that have the same process group  as  the  terminal
           are  foreground and may read, while others will block with
           a signal if they attempt to read.

           These calls are thus used by programs such  as  csh(1)  to
           create  process  groups  in implementing job control.  The
           TIOCGPGRP and TIOCSPGRP calls described in termios(4)  are
           used to get/set the process group of the control terminal.

    RETURN VALUE
           On success, setpgid and setpgrp return zero.  On error, -1
           is returned, and errno is set appropriately.

           getpgid  returns a process group on success.  On error, -1
           is returned, and errno is set appropriately.

           getpgrp always returns the current process group.

    ERRORS
           EINVAL  pgid is less than 0.

           EPERM   Various permission violations.

           ESRCH   pid does not match any process.

    Linux 1.2.4               15 April 1995                         1

    SETPGID(2)          Linux Programmer's Manual          SETPGID(2)

### SEE ALSO

getuid, setsid, tcsetpgrp, termios,

###

    Linux 1.2.4               15 April 1995                         2

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