setsid(2) - NetBSD Manual Pages

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SETSID(2)                 NetBSD Programmer's Manual                 SETSID(2)


NAME

     setsid - create session and set process group ID


SYNOPSIS

     #include <sys/types.h>
     #include <unistd.h>

     pid_t
     setsid(void);


DESCRIPTION

     The setsid function creates a new session.  The calling process is the
     session leader of the new session, is the process group leader of a new
     process group and has no controlling terminal.  The calling process is
     the only process in either the session or the process group.

     Upon successful completion, the setsid function returns the value of the
     process group ID of the new process group, which is the same as the pro-
     cess ID of the calling process.


ERRORS

     If an error occurs, setsid returns -1 and the global variable errno is
     set to indicate the error, as follows:

     [EPERM]       The calling process is already a process group leader, or
                   the process group ID of a process other than the calling
                   process matches the process ID of the calling process.


SEE ALSO

     setpgid(2),  tcgetpgrp(3),  tcsetpgrp(3)


STANDARDS

     The setsid function conforms to IEEE Std1003.1-1990 (``POSIX'').

4.4BSD                           June 4, 1993                                1