TCSETPGRP(3) | Library Functions Manual | TCSETPGRP(3)

# NAME

`tcsetpgrp` — set foreground process group ID

# SYNOPSIS

`#include <unistd.h>`

int
`tcsetpgrp`(int fd, pid_t pgrp_id);

# DESCRIPTION

If the process has a controlling terminal, the `tcsetpgrp`() function sets the foreground process group ID associated with the terminal device to pgrp_id. The terminal device associated with fd 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 pgrp_id must be the same as the process group ID of a process in the same session as the calling process.

If the calling process is a member of a background process group, the process group will be sent a `SIGTTOU` signal. If the calling process is blocking or ignoring `SIGTTOU` signals, the process is allowed to perform the operation and the `SIGTTOU` signal is not sent.

Upon successful completion, `tcsetpgrp`() returns a value of zero.

# ERRORS

If an error occurs, `tcsetpgrp`() 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.
[`EINTR`]
  The `tcsetpgrp`() function was interrupted by a signal.
[`EINVAL`]
  An invalid value of pgrp_id was specified.
[`ENOTTY`]
  The calling process does not have a controlling terminal, or the file represented by fd is not the controlling terminal, or the controlling terminal is no longer associated with the session of the calling process.
[`EPERM`]
  The pgrp_id argument does not match the process group ID of a process in the same session as the calling process.

# SEE ALSO

setpgid(2), setsid(2), tcgetpgrp(3)

# STANDARDS

The `tcsetpgrp`() function is compliant with the IEEE Std 1003.1-1988 (“POSIX.1”) specification.

January 12, 2023 | Debian