tcgetsid - get session ID
#define _XOPEN_SOURCE 500 /* See feature_test_macros(7) */
#include <termios.h>
pid_t tcgetsid(int fd);
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.
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 appropriately.
- 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.
tcgetsid() is provided in glibc since version 2.1.
For an explanation of the terms used in this section, see
attributes(7).
| Interface |
Attribute |
Value |
| tcgetsid () |
Thread safety |
MT-Safe |
POSIX.1-2001, POSIX.1-2008.
This function is implemented via the
TIOCGSID ioctl(2), present
since Linux 2.1.71.
getsid(2)