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notty.c
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notty.c
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#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
/* our detach-from-tty function */
void detach_tty()
{
/* try to open the controlling TTY */
int fd=open("/dev/tty",O_RDWR);
if(fd<0){
/* failed: we do not need to detach */
fprintf(stderr,"No TTY to begin with.\n");
return;
}
/* try to detach */
if(ioctl(fd,TIOCNOTTY))
fprintf(stderr,"Warning: unable to detach from TTY\n");
else
fprintf(stderr,"Detached.\n");
/* close the handle, it is not needed anymore */
close(fd);
}
int main(int argc,char**argv)
{
/* do we have something to do? */
if(argc<2){
fprintf(stderr,"Usage: %s command [arguments...]\n",argv[0]);
return 1;
}
/* detach controlling TTY */
detach_tty();
/* call original program */
execvp(argv[1],argv+1);
/* normally execvp does not return*/
/* the call failed for some reason */
fprintf(stderr,"Unable to execute: %s.\n", strerror(errno));
return 1;
}