src/regression/syscall-sign-extend.c

   1 // commit 5f95f965e933c5b155db75520ac27c92ddbcf400 2014-03-18
   2 // syscall should not sign extend pointers on x32
   3 #define _GNU_SOURCE
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <string.h>
   7 #include <sys/syscall.h>
   8 #include <unistd.h>
   9 #include "test.h"
  10
  11 #define T(f) (!(f) && (t_error(#f " failed: %s\n", strerror(errno)), 0))
  12
  13 int main(void)
  14 {
  15         char buf[1] = {1};
  16         int fd;
  17         int r;
  18
  19         // test syscall with pointer
  20         T((fd = open("/dev/zero", O_RDONLY)) >= 0);
  21         T((r = syscall(SYS_read, fd, buf, 1)) == 1);
  22         if (buf[0] != 0)
  23                 t_error("read %d instead of 0\n", buf[0]);
  24
  25         return t_status;
  26 }