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getsid(2) System Calls Manual getsid(2) NAME getsid - Retrieves the session ID of a process SYNOPSIS #include <unistd.h> pid_t getsid( pid_t process_id); 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: getsid(): XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies the process ID that identifies the process for which you want to retrieve a session ID. DESCRIPTION Use the getsid function to retrieve the session ID for a process. The function returns the session ID assigned to the process identified in the process_id parameter. If you specify 0 (zero) in the process_id parameter, the getsid function returns the session ID of the calling process. RETURN VALUES Upon successful completion, the getsid() function returns the session ID of the process identified by the process_id parameter. Otherwise, the function returns -1 and sets errno to indicate the error. ERRORS The getsid() function sets errno to the specified values for the fol- lowing conditions: The process_id parameter identifies a process that is in a different session from the calling process. A process can use the getsid() function to get information only about processes in its own session. The system cannot locate the process identified by the process_ID parameter. RELATED INFORMATION Functions: exec(2), fork(2), getpid(2), setpgid(2), setsid(2) Standards: standards(5) delim off getsid(2)