tcgetsid3
Get session id
Usage
#define _XOPEN_SOURCE 500 /* See feature_test_macros(7) */ #include <termios.h>
pid_t tcgetsid(int fd);
Library
Standard C library (libc, -lc)
Overview
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.
Attributes
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| tcgetsid() | Thread safety | MT-Safe |
Releases
12 releases since Debian 3.1 (Sarge); the text changed 11 times.