TCGETPGRP(3)

NAME
tcgetpgrp - get foreground process group ID

SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
pid_t
tcgetpgrp(int fd);

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.

SEE ALSO
setpgid(2), setsid(2), tcsetpgrp(3)

STANDARDS
The tcgetpgrp() function is expected to be compliant with the p1003.1-88 specification.