Only the stronger will survive.( Charles Darwin)
As i posted my first fifo error problem which was a practice thing .Now i am doing what i m supposed to do.
I m making this code first which is running is background.whenever any one will write on
the fifo it creates the control will come out of the select.
#include <stdio.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
int main(void)
{
int fds;
fd_set fd;
struct timeval tv;
int retval,age;
char data1[100];
/*Creating A FIFO*/
if (mkfifo("/home/ishan/fifo3", S_IRWXU|S_IROTH) != 0)
perror("mkfifo() error");
else
puts("success");
/* Opening A FIFO*/
if ((fds=open("/home/ishan/fifo3",O_RDONLY)) < 0)
{
perror("open()error");
}
else
{
puts("!success");
}
/*Watch stdin (fd 0) to see when it has input. */
FD_ZERO(&fd);
FD_SET(fds, &fd);
/* Wait up to five seconds. */
tv.tv_sec = 10;
tv.tv_usec = 0;
while(1)
{
retval = select(fds+1, &fd, NULL, NULL, &tv);
if(retval==-1)
{
printf("\n !!ERROR!!");
}
else
{
printf("\n Problem is solved!");
}
printf("\n enter your age plz");
scanf("%d",&age);
printf("\n skipped scanf");
/* Don't rely on the value of tv now! */
if(FD_ISSET(fds,&fd))
printf("............ data received \n");
else
printf("............ data not received \n");
if (retval == -1)
perror("select()");
else if (retval)
printf("Data is available now.\n");
/* FD_ISSET(0, &fd) will be true. */
else
printf("No data within ten seconds.\n");
#if 0
if(read(fds,data1,strlen(data1))>0)
puts(data1);
else
printf("error .............. ");
#endif
}
return 0;
}code 2:
via this code i m writing on fifo3
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include<fcntl.h>
int main()
{
char data[100];
int rc,fd;
/* Opening A FIFO*/
if ((fd=open("/home/ishan/fifo3",O_RDWR)) < 0)
{
perror("open()error");
}
else
{
puts("success");
}
/* Writing A FIFO*/
puts("\n enter data to be written");
gets(data);
if (-1 == (rc=write(fd, data, strlen(data))))
{
perror("write failed");
return(0);
}
else
{
puts("\n*\n");
puts(data);
}
return 0;
}Output:
!success
success
enter data to be written
ishaan\
*
ishaan\
Problem is solved!
enter your age plz
it is not letting me scanf in first code but when i manually take the first process in foreground then its allowing to scanf.
Continued Output after using fg:
23
skipped scanf............ data received
Data is available now.
Is there any alternate way that it allows me to scanf without using fg commansd to take process 1 in fore ground.
