TIOCGPGRP, TIOCSPGRP, TIOCGSID - process group and session ID

TIOCGPGRP When successful, equivalent to *argp=tcgetpgrp(fd). Get the process group ID of the foreground process group on this terminal. TIOCSPGRP Equivalent to tcsetpgrp(fd,*argp). Set the foreground process group ID of this terminal. TIOCGSID When successful, equivalent to *argp=tcgetsid(fd). Get the session ID of the given terminal. This fails with the error ENOTTY if the terminal is not a master pseudoterminal and not our controlling terminal. Strange.

ENOTTY The terminal is not a master pseudoterminal and not our controlling terminal. EPERM Insufficient permission.

Standard C library (libc, -lc)

TIOCGPGRP, TIOCSPGRP, TIOCGSID - process group and session ID

On success, 0 is returned. On error, -1 is returned, and errno is set to indicate the error.

ioctl(2), ioctl_tty(2), tcgetpgrp(3), tcsetpgrp(3), tcgetsid(3) Linux man-pages 6.9.1 2024-06-13 TIOCSPGRP(2const)

#include<asm/termbits.h> /* Definition of TIOC* constants */ #include<sys/ioctl.h>intioctl(intfd,TIOCGPGRP,pid_t*argp);intioctl(intfd,TIOCSPGRP,constpid_t*argp);intioctl(intfd,TIOCGSID,pid_t*argp);