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TCGETSID(3) Linux Programmer's Manual TCGETSID(3) NAME tcgetsid - get session ID SYNOPSIS #define _XOPEN_SOURCE 500 /* See feature_test_macros(7) */ #include <termios.h> pid_t tcgetsid(int fd); DESCRIPTION The function tcgetsid() returns the session ID of the current session that has the terminal associated to fd as controlling terminal. This terminal must be the controlling terminal of the calling process. RETURN VALUE When fd refers to the controlling terminal of our session, the function tcgetsid() will return the session ID of this session. Otherwise, -1 is returned, and errno is set to indicate the error. ERRORS EBADF fd is not a valid file descriptor. ENOTTY The calling process does not have a controlling terminal, or it has one but it is not described by fd. VERSIONS tcgetsid() is provided in glibc since version 2.1. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββ€ βtcgetsid() β Thread safety β MT-Safe β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββ CONFORMING TO POSIX.1-2001, POSIX.1-2008. NOTES This function is implemented via the TIOCGSID ioctl(2), present since Linux 2.1.71. SEE ALSO getsid(2) GNU 2021-03-22 TCGETSID(3)