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setsid (2)
  • setsid (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • setsid (2) ( Solaris man: Системные вызовы )
  • setsid (2) ( FreeBSD man: Системные вызовы )
  • setsid (2) ( Русские man: Системные вызовы )
  • >> setsid (2) ( Linux man: Системные вызовы )
  • setsid (3) ( POSIX man: Библиотечные вызовы )
  • setsid (8) ( Linux man: Команды системного администрирования )
  •  

    NAME

    setsid - creates a session and sets the process group ID
     
    

    SYNOPSIS

    #include <unistd.h>

    pid_t setsid(void);
     

    DESCRIPTION

    setsid() creates a new session if the calling process is not a process group leader. The calling process is the leader of the new session, the process group leader of the new process group, and has no controlling tty. The process group ID and session ID of the calling process are set to the PID of the calling process. The calling process will be the only process in this new process group and in this new session.  

    RETURN VALUE

    The session ID of the calling process.  

    ERRORS

    On error, -1 is returned, and errno is set. The only error which can happen is EPERM. It is returned when the process group ID of any process equals the PID of the calling process. Thus, in particular, setsid() fails if the calling process is already a process group leader.  

    CONFORMING TO

    SVr4, POSIX.1-2001.  

    NOTES

    A child created via fork(2) inherits its parent's session ID. The session ID is preserved across an execve(2).

    A process group leader is a process with process group ID equal to its PID. In order to be sure that setsid() will succeed, fork(2) and _exit(2), and have the child do setsid().  

    SEE ALSO

    getsid(2), setpgid(2), setpgrp(2), tcgetsid(3), credentials(7)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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