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tcgetsid(3) Library Functions Manual tcgetsid(3) NAME tcgetsid - Returns the session ID of the terminal LIBRARY Standard C Library (libc.so, libc.a) SYNOPSIS #include <termios.h> pid_t tcgetsid( pid_t fildes); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: tcgetsid(): XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies a terminal. DESCRIPTION The tcgetsid routine is a part of the general terminal interface. This routine obtains the session ID of the terminal as specified by the fildes parameter. RETURN VALUE On success, the tcgetsid returns the session ID that is associated with the terminal specified. If the session ID of the terminal cannot be obtained, a value of (pid_t)-1 is returned and errno is set to indicate error. ERRORS The tcgetsid() function sets errno to the specified values for the fol- lowing conditions: The descriptor fildes is not associated with a con- trolling terminal. The descriptor fildes is not valid. [XPG4-UNIX] The file associated with fildes is not a terminal. [Digital] The descriptor fildes is not associated with a char- acter special device or the specified request does not apply to the kind of object that fildes references. RELATED INFORMATION Standards: standards(5) delim off tcgetsid(3)