NAME

tcgetpgrp — get the foreground process group ID

SYNOPSIS

#include <sys/types.h>
#include <unistd.h>

pid_t tcgetpgrp(int fildes);

DESCRIPTION

The tcgetpgrp() function will return the value of the process group ID of the foreground process group associated with the terminal.

If there is no foreground process group, tcgetpgrp() returns a value greater than 1 that does not match the process group ID of any existing process group.

The tcgetpgrp() function is allowed from a process that is a member of a background process group; however, the information may be subsequently changed by a process that is a member of a foreground process group.

RETURN VALUE

Upon successful completion, tcgetpgrp() returns the value of the process group ID of the foreground process associated with the terminal. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

The tcgetpgrp() function will fail if:

[EBADF]

The fildes argument is not a valid file descriptor.

[ENOTTY]

The calling process does not have a controlling terminal, or the file is not the controlling terminal.

EXAMPLES

None.

APPLICATION USAGE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

setsid(3) , setpgid(3) , tcsetpgrp(3) , <sys/types.h> , <unistd.h> .

DERIVATION

Derived from the POSIX.1-1988 standard.