How do you do nonblocking console IO on Linux/OS X in C?
I want to add an example:
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
int main(int argc, char const *argv[])
{
char buf[20];
fcntl(0, F_SETFL, fcntl(0, F_GETFL) | O_NONBLOCK);
sleep(4);
int numRead = read(0, buf, 4);
if (numRead > 0) {
printf("You said: %s", buf);
}
}
When you run this program you have 4 seconds to provide input to standard in. If no input found, it will not block and will simply return.
2 sample executions:
Korays-MacBook-Pro:~ koraytugay$ ./a.out
fda
You said: fda
Korays-MacBook-Pro:~ koraytugay$ ./a.out
Korays-MacBook-Pro:~ koraytugay$