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#include <assert.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/uio.h>
#ifdef USE_HOST_LIBC
#define TEST_FILE "readv-writev-host-libc.tmp"
#else
#define TEST_FILE "readv-writev.tmp"
#endif
int main() {
// Make sure that it wasn't created by a previous test run
unlink(TEST_FILE);
int fd = open(TEST_FILE, O_RDWR | O_CREAT, 0644);
assert(fd != -1);
char str0[] = "hello ";
char str1[] = "world!";
struct iovec bufs[2] = {
{
.iov_base = &str0,
.iov_len = strlen(str0),
},
{
.iov_base = &str1,
.iov_len = strlen(str1),
},
};
ssize_t written = writev(fd, bufs, 2);
assert(written == 12);
memset(&str0, 0, strlen(str0));
memset(&str1, 0, strlen(str1));
assert(!lseek(fd, 0, SEEK_SET));
ssize_t read = readv(fd, bufs, 2);
assert(read == 12);
assert(!strncmp(str0, "hello ", 7));
assert(!strncmp(str1, "world!", 7));
assert(!close(fd));
unlink(TEST_FILE);
}
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