TCGETPGRP(3) |
FreeBSD Library Functions Manual |
TCGETPGRP(3) |
NAME
tcgetpgrp —
get foreground process group ID
LIBRARY
Standard C Library (libc, -lc)
DESCRIPTION
The
tcgetpgrp() function returns the value of the process group ID of the foreground process group associated with the terminal device. If there is no foreground process group,
tcgetpgrp() returns an invalid process ID.
ERRORS
If an error occurs,
tcgetpgrp() 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.
STANDARDS
The
tcgetpgrp() function is expected to be compliant with the IEEE Std 1003.1-1988 (“POSIX.1”) specification.