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    Command:

    getsid

    
    
    

    SYNOPSIS

           #include <unistd.h>
    
           pid_t getsid(pid_t pid);
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           getsid():
               _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
               || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
    
    
    

    DESCRIPTION

           getsid(0)  returns  the  session  ID of the calling process.  getsid(p)
           returns the session ID of the process with process ID p.  (The  session
           ID of a process is the process group ID of the session leader.)
    
    
    

    RETURN VALUE

           On  success,  a  session  ID is returned.  On error, (pid_t) -1 will be
           returned, and errno is set appropriately.
    
    
    

    ERRORS

           EPERM  A process with process ID p exists, but it is not  in  the  same
                  session as the calling process, and the implementation considers
                  this an error.
    
           ESRCH  No process with process ID p was found.
    
    
    

    VERSIONS

           This system call is available on Linux since version 2.0.
    
    
    

    CONFORMING TO

           SVr4, POSIX.1-2001.
    
    
    

    NOTES

           Linux does not return EPERM.
    
    
    

    SEE ALSO

           getpgid(2), setsid(2), credentials(7)
    
    
    

    Linux 2010-09-26 GETSID(2)

    
    
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