|TCGETPGRP(3)||Linux Programmer's Manual||TCGETPGRP(3)|
pid_t tcgetpgrp(int fd);
int tcsetpgrp(int fd, pid_t pgrp);
The function tcsetpgrp() makes the process group with process group ID pgrp the foreground process group on the terminal associated to fd, which must be the controlling terminal of the calling process, and still be associated with its session. Moreover, pgrp must be a (nonempty) process group belonging to the same session as the calling process.
If tcsetpgrp() is called by a member of a background process group in its session, and the calling process is not blocking or ignoring SIGTTOU, a SIGTTOU signal is sent to all members of this background process group.
When successful, tcsetpgrp() returns 0. Otherwise, it returns -1, and errno is set appropriately.
- fd is not a valid file descriptor.
- pgrp has an unsupported value.
- The calling process does not have a controlling terminal, or it has one but it is not described by fd, or, for tcsetpgrp(), this controlling terminal is no longer associated with the session of the calling process.
- pgrp has a supported value, but is not the process group ID of a process in the same session as the calling process.
|tcgetpgrp (), tcsetpgrp ()||Thread safety||MT-Safe|