08-16-2005
Quote:
Originally Posted by RishiPahuja
..is there anyway we will be connecting to tty?
You are not connecting to a tty. Somewhere you are assuming that you are connected to a tty and doing something that only works with a tty.
I do not see a problem with that function. Since your first function seems to work, it is more probable that the error is there. My guess is that the function you posted is never even invoked. After the first function sorts your file, what else does it do? What happens between the first function call and the second function call? Does any module include termio.h or termios.h? Anything requiring them could be the problem. And you of course have searched for an explicit call to ioctl(), right?
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LEARN ABOUT MOJAVE
forkpty
OPENPTY(3) BSD Library Functions Manual OPENPTY(3)
NAME
openpty, login_tty, forkpty -- tty utility functions
SYNOPSIS
#include <util.h>
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(), login_tty(), and forkpty() functions perform manipulations on ttys and pseudo-ttys.
The openpty() function allocates a pseudo-tty and returns file descriptors for the master and slave in amaster and aslave. If name is non-
null, the filename of the slave is returned in name. If termp is non-null, the terminal parameters of the slave will be set to the values in
termp. If winp is non-null, the window 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, out-
put, and error streams of the current process, and closing fd.
The forkpty() function combines openpty(), fork(), and login_tty() to creates 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 non-null. The termp and winp
parameters, if non-null, will determine the terminal 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 indicate the error. Otherwise,
openpty(), login_tty(), and the child process of forkpty() return 0, and the parent process of forkpty() returns the process ID of the child
process.
ERRORS
openpty() will fail if:
[EAGAIN] There are no available pseudo-ttys.
login_tty() 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/ptmx cloning pseudo-tty device
/dev/ttys[0-9][0-9][0-9] slave pseudo-tty devices
SEE ALSO
fork(2)
BSD
April 5, 2008 BSD