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The following minimal C code shows how EINTR can be handled:
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <signal.h>
#define BUFFER_SIZE 1024
int
main()
{
 char buffer[BUFFER_SIZE];
 printf("PID = %d\n", getpid());
 while (1) {
 int rv = fgetc(stdin);
 if (rv < 0) {
 if (feof(stdin))
 break;
 if (errno == EINTR)
 continue;
 printf("Call failed with %d\n", errno);
 return 1;
 }
 else
 fputc(rv, stdout);
 }
 return 0;
}
Test application:
mitsuhiko@nausicaa:/tmp$ ./a.out 
PID = 22806
Terminated
mitsuhiko@nausicaa:/tmp$ ./a.out 
PID = 22809
mitsuhiko@nausicaa:/tmp$ ./a.out 
PID = 22812
^Z
[2]+ Stopped ./a.out
mitsuhiko@nausicaa:/tmp$ fg
./a.out
test
test
foo
foo
First signal sent was TERM, second was INT. Last case was sending to background, receiving the ignored SIGCONT signal, fgetc returning -1 and fgetc being called again because of errno being EINTR.