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#include <stdlib.h>
#include <sys/select.h>
int timed_read(int timeout)
{
char byte;
if (timeout >= 0) {
fd_set readfds;
struct timeval t;
FD_ZERO(&readfds);
FD_SET(0, &readfds);
t.tv_sec = timeout / 1000000;
t.tv_usec = timeout % 1000000;
if (select(1, &readfds, NULL, NULL, &t) == 1) {
if (read(0, &byte, 1) == 1) {
return byte;
}
else {
return -1;
}
}
else {
return -1;
}
}
else {
if (read(0, &byte, 1) == 1) {
return byte;
}
else {
return -1;
}
}
}
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