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setsid(2) System Calls Manual setsid(2) NAME setsid - Sets the process group ID SYNOPSIS #include <unistd.h> pid_t setsid( void ); Application developers may want to specify an #include statement for <sys/types.h> before the one for <unistd.h> if programs are being de- veloped for multiple platforms. The additional #include statement is not required on DIGITAL UNIX systems or by ISO or X/Open standards, but may be required on other vendors' systems that conform to these stan- dards. STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: setsid(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. DESCRIPTION The setsid() function creates a new session when the calling process is not a process group leader. The calling process then becomes the ses- sion leader of this session, becomes the process leader of the new process group, and has no controlling terminal. The process group ID of the calling process is set equal to its process ID. The calling process becomes the only process in the new process group and the only process in the new session. RETURN VALUES Upon successful completion, the setsid function returns the value of the new process group ID. Otherwise, a value of (pid_t)-1 is returned and errno is set to indicate the error. ERRORS The setsid() function sets errno to the specified values for the fol- lowing conditions: The calling process is already the process group leader, or the process group ID of another process matches the process ID of the calling process. RELATED INFORMATION Functions: getpid(2), getsid(2), setpgid(2) Standards: standards(5) delim off setsid(2)