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RedHat 9 (Linux i386) - man page for openpty (redhat section 3)

OPENPTY(3)				      Linux Programmer's Manual 				   OPENPTY(3)

NAME
openpty, login_tty, forkpty - tty utility functions
SYNOPSIS
#include <pty.h> /* for openpty and forkpty */ #include <utmp.h> /* for login_tty */ int openpty(int *amaster, int *aslave, char *name, struct termios *termp, struct winsize * winp); int login_tty(int fd); pid_t forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp);
DESCRIPTION
The openpty() function finds an available pseudo-tty and returns file descriptors for the master and slave in amaster and aslave. If name is not NULL, the filename of the slave is returned in name. If termp is not NULL, the terminal parameters of the slave will be set to the values in termp. If winp is not NULL, the win- dow size of the slave will be set to the values in winp. The login_tty() function prepares for a login on the tty fd (which may be a real tty device, or the slave of a pseudo-tty as returned by openpty()) by creating a new session, making fd the controlling terminal for the current process, setting fd to be the standard input, output, and error streams of the current process, and closing fd. The forkpty() function combines openpty(), fork(), and login_tty() to create a new process operating in a pseudo-tty. The file descriptor of the master side of the pseudo-tty is returned in amaster, and the filename of the slave in name if it is not NULL. The termp and winp parameters, if not NULL, will determine the termi- nal attributes and window size of the slave side of the pseudo-tty.
RETURN VALUES
If a call to openpty(), login_tty(), or forkpty() is not successful, -1 is returned and errno is set to indi- cate the error. Otherwise, openpty(), login_tty(), and the child process of forkpty() return 0, and the par- ent process of forkpty() returns the process ID of the child process.
ERRORS
openpty() will fail if: ENOENT There are no available ttys. login_pty() will fail if ioctl() fails to set fd to the controlling terminal of the current process. forkpty() will fail if either openpty() or fork() fails.
FILES
/dev/[pt]ty[pqrstuwxyzabcdePQRST][0123456789abcdef]
CONFORMING TO
These are BSD functions, present in libc5 and glibc2.
SEE ALSO
fork(2)
BSD MANPAGE
2001-12-13 OPENPTY(3)


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