tcgetsid
—
get session ID associated with a controlling terminal
Standard C Library (libc, -lc)
The tcgetsid
function returns the value of the session
ID associated with the specified controlling terminal device. The session ID
is defined as the process group ID of the session leader.
If an error occurs, tcgetsid
returns -1 and the global
variable errno is set to indicate the error, as follows:
- [
EBADF
]
- The fd argument is not a valid file descriptor.
- [
ENOTTY
]
- The calling process does not have a controlling terminal or the underlying
terminal device represented by fd is not the
controlling terminal.
The tcgetsid
function conforms to
X/Open Portability Guide Issue 4, Version 2
(“XPG4.2”).