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      1 #include <fcntl.h>
      2 #include <unistd.h>
      3 #include <sys/uio.h>
      4 #include <assert.h>
      5 
      6 int
      7 main(void)
      8 {
      9 	const off_t offset = 0xdefaceddeadbeefLL;
     10 	int fd;
     11 	char buf[4];
     12 	struct iovec iov = { buf, sizeof buf };
     13 
     14 	assert((fd = open("/dev/zero", O_RDONLY)) >= 0);
     15 	assert(pread(fd, buf, sizeof buf, offset) == 4);
     16 	assert(preadv(fd, &iov, 1, offset) == 4);
     17 	assert(!close(fd));
     18 
     19 	assert((fd = open("/dev/null", O_WRONLY)) >= 0);
     20 	assert(pwrite(fd, buf, sizeof buf, offset) == 4);
     21 	assert(pwritev(fd, &iov, 1, offset) == 4);
     22 	assert(!close(fd));
     23 
     24 	return 0;
     25 }
     26