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#include <stdio.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#define K_1 8192
#define NBUFS 2
#define CHUNK K_1 /* single chunk */
#define MAX_IOVEC 2
#define DATA_FILE "writev_data_file"
static char buf1[K_1];
static char buf2[K_1];
static char *buf_list[NBUFS], f_name[]="writev_data_file";
static int fd;
struct iovec wr_iovec[MAX_IOVEC] = {
{(caddr_t)-1, CHUNK},
{(caddr_t)NULL, 0}
};
int main(void)
{
int nbytes;
/* Fill the buf_list[0] and buf_list[1] with 0 zeros */
buf_list[0] = buf1;
buf_list[1] = buf2;
memset(buf_list[0], 0, K_1);
memset(buf_list[1], 0, K_1);
if ((fd = open(f_name, O_WRONLY | O_CREAT, 0666)) < 0) {
fprintf(stderr, "open(2) failed: fname = %s, errno = %d\n",
f_name, errno);
return 1;
} else if ((nbytes = write(fd, buf_list[1], K_1)) != K_1) {
fprintf(stderr, "write(2) failed: nbytes = %d, errno = %d\n",
nbytes, errno);
return 1;
}
if (close(fd) < 0) {
fprintf(stderr, "close failed: errno = %d\n", errno);
return 1;
}
fprintf(stderr, "Test file created.\n");
if ((fd = open(f_name, O_RDWR, 0666)) < 0) {
fprintf(stderr, "open failed: fname = %s, errno = %d\n",
f_name, errno);
return 1;
}
lseek(fd, 0, 0);
if (writev(fd, wr_iovec, 2) < 0) {
if (errno == EFAULT)
fprintf(stderr, "Received EFAULT as expected\n");
else
fprintf(stderr, "Expected EFAULT, got %d\n", errno);
lseek(fd, K_1, 0);
if ((nbytes = read(fd, buf_list[0], CHUNK)) != 0)
fprintf(stderr, "Expected nbytes = 0, got %d\n", nbytes);
}
else
fprintf(stderr, "Error writev returned a positive value\n");
// Now check invalid vector count
if (writev(fd, wr_iovec, -1) < 0) {
if (errno == EINVAL)
fprintf(stderr, "Received EINVAL as expected\n");
else
fprintf(stderr, "expected errno = EINVAL, got %d\n", errno);
}
else
fprintf(stderr, "Error writev returned a positive value\n");
if (readv(fd, wr_iovec, -1) < 0) {
if (errno == EINVAL)
fprintf(stderr, "Received EINVAL as expected\n");
else
fprintf(stderr, "expected errno = EINVAL, got %d\n", errno);
}
else
fprintf(stderr, "Error readv returned a positive value\n");
unlink(f_name);
return 0;
}
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