June 4, 1993 TCGETPGRP 3

### NAME

tcgetpgrp - get foreground process group ID

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```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 conforms to ISO/IEC 9945-1:1990 (``POSIX.1'') .