tcsetpgrp()

Set the process group ID for a device

Synopsis:

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

int tcsetpgrp( int fildes,
               pid_t pgrp_id );

Arguments:

fildes
A file descriptor that's associated with the device whose process group ID you want to set.
pgrp_id
The process group ID that you want to assign to the device.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The tcsetpgrp() function sets the process group ID associated with the device indicated by fildes to be pgrp_id.

In order to set the process group ID, your process must have the PROCMGR_AID_SESSION ability enabled. For more information, see procmgr_ability().

If successful, the tcsetpgrp() function causes subsequent breaks on the indicated terminal device to generate a SIGINT on all process in the given process group.

Returns:

0
Success.
-1
An error occurred (errno is set).

Errors:

EBADF
The argument fildes is invalid.
EINVAL
The argument pgrp_id is invalid.
ENOSYS
The resource manager associated with fildes doesn't support this call.
ENOTTY
The argument fildes isn't associated with a terminal device.
EPERM
The argument pgrp_id isn't part of the same session as the calling process.

Examples:

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

int main( void )
  {
    /*
     * Direct breaks on stdin to me
     */
    tcsetpgrp( 0, getpid() );
    return EXIT_SUCCESS;
  }

Classification:

POSIX 1003.1

Safety:
Cancellation pointNo
Interrupt handlerNo
Signal handlerYes
ThreadYes

Related links

  • procmgr_ability()

    Control a process's ability to perform certain operations

  • signal()

    Set handling for exceptional conditions

  • tcgetpgrp()

    Get the process group ID associated with a device