TCGETPGRP(3C) Standard C Library Functions TCGETPGRP(3C)

NAME

tcgetpgrp - get 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 VALUES

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.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+--------------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+--------------------------------+
|Interface Stability | Standard |
+--------------------+--------------------------------+
|MT-Level | MT-Safe, and Async-Signal-Safe |
+--------------------+--------------------------------+

SEE ALSO

setpgid(2), setsid(2), tcsetpgrp(3C), termio(4I), attributes(7),
standards(7)

August 14, 2002 TCGETPGRP(3C)