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.
fd is not a valid file descriptor.
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)
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