NAME

tcsetpgrp - set the foreground process group ID

 SYNOPSIS

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

int tcsetpgrp(int fildes, pid_t pgid_id);

 DESCRIPTION

If the process has a controlling terminal, tcsetpgrp() will set the foreground process group ID associated with the terminal to pgid_id. The file associated with fildes must be the controlling terminal of the calling process and the controlling terminal must be currently associated with the session of the calling process. The value of pgid_id must match a process group ID of a process in the same session as the calling process.

Attempts to use tcsetpgrp() from a process which is a member of a background process group on a fildes associated with its controlling terminal will cause the process group to be sent a SIGTTOU signal. If the calling process is blocking or ignoring SIGTTOU signals, the process is allowed to perform the operation, and no signal is sent.

 RETURN VALUE

Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.

 ERRORS

The tcsetpgrp() function will fail if:

[EBADF]

The fildes argument is not a valid file descriptor.

[EINVAL]

This implementation does not support the value in the pgid_id argument.

[ENOTTY]

The calling process does not have a controlling terminal, or the file is not the controlling terminal, or the controlling terminal is no longer associated with the session of the calling process.

[EPERM]

The value of pgid_id does not match the process group ID of a process in the same session as the calling process.

 EXAMPLES

None.

 APPLICATION USAGE

None.

 FUTURE DIRECTIONS

None.

 SEE ALSO

tcgetpgrp(), <sys/types.h>, <unistd.h>.

DERIVATION

Derived from the POSIX.1-1988 standard.