getsid - get session ID


SYNOPSIS

       #include <unistd.h>

       pid_t getsid(pid_t pid);


DESCRIPTION

       getsid(0)  returns  the session ID of the calling process.
       getsid(p) returns the session ID of the process with  pro­
       cess ID p.


ERRORS

       On  error,  -1 will be returned.  The only error which can
       happen is ESRCH, when no process with  process  ID  p  was
       found.


CONFORMING TO

       SVr4, which documents an additional EPERM error condition.


SEE ALSO

       setsid(2)