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Full Discussion: stdin redirection
Top Forums UNIX for Dummies Questions & Answers stdin redirection Post 302401165 by cypleen on Friday 5th of March 2010 04:53:22 AM
Old 03-05-2010
Thank you Binlib for your answer.
But my problem is not solved. I added this in my code:

Code:
int    pFile = -1;
pFile = open("/dev/tty",O_RDONLY);
if (pFile == -1)
 printf("échec sur ouverture /dev/tty");
else
 printf("ouverture /dev/tty réussie");
scanf("%s", command);
close (pFile);

When I execute the code, after this, stdin stays assigned to the keyboard. I would like that it returns to file1.
So, if you can explain to me how reassign stdin to file1, I think that it will be won if i use lseek before and after opened /dev/tty.
Last edited by Franklin52; 03-05-2010 at 06:05 AM.. Reason: Please use code tags!
 

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LEARN ABOUT REDHAT

tty

TTY(4)							     Linux Programmer's Manual							    TTY(4)

NAME

       tty - controlling terminal

DESCRIPTION

       The  file /dev/tty is a character file with major number 5 and minor number 0, usually of mode 0666 and owner.group root.tty.  It is a syn-
       onym for the controlling terminal of a process, if any.

       In addition to the ioctl() requests supported by the device that tty refers to, the following ioctl() request is supported:

       TIOCNOTTY
	      Detach the current process from its controlling terminal, and remove it from its current process group, without attaching  it  to  a
	      new  process  group  (that  is,  set  its  process group ID to zero).  This ioctl() call only works on file descriptors connected to
	      /dev/tty; this is used by daemon processes when they are invoked by a user at a terminal.  The process attempts to open /dev/tty; if
	      the open succeeds, it detaches itself from the terminal by using TIOCNOTTY, while if the open fails, it is obviously not attached to
	      a terminal and does not need to detach itself.

FILES

       /dev/tty

SEE ALSO

       mknod(1), chown(1), getty(1), termios(3), console(4), ttys(4)

Linux								    1992-01-21								    TTY(4)
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