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/* $OpenBSD: pwrite.c,v 1.6 2014/02/28 16:14:05 espie Exp $ */
/*
* Written by Artur Grabowski <art@openbsd.org> 2002 Public Domain.
*/
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
char temp[] = "/tmp/pwriteXXXXXXXXX";
const char magic[10] = "0123456789";
const char zeroes[10] = "0000000000";
char buf[10];
char c;
int fd, ret;
if ((fd = mkstemp(temp)) < 0)
err(1, "mkstemp");
remove(temp);
if (write(fd, zeroes, sizeof(zeroes)) != sizeof(zeroes))
err(1, "write");
if (lseek(fd, 5, SEEK_SET) != 5)
err(1, "lseek");
if (pwrite(fd, &magic[1], 4, 4) != 4)
err(1, "pwrite");
if (read(fd, &c, 1) != 1)
err(1, "read");
if (c != '2')
errx(1, "read %c != %c", c, '2');
c = '5';
if (write(fd, &c, 1) != 1)
err(1, "write");
if (write(fd, &c, 0) != 0)
err(1, "write");
if (pread(fd, buf, 10, 0) != 10)
err(1, "pread");
if (memcmp(buf, "0000125400", 10) != 0)
errx(1, "data mismatch: %s != %s", buf, "0000125400");
if ((ret = pwrite(fd, &magic[5], 1, -1)) != -1)
errx(1, "pwrite with negative offset succeeded,\
returning %d", ret);
if (errno != EINVAL)
err(1, "pwrite with negative offset");
if ((ret = pwrite(fd, &magic[5], 1, LLONG_MAX)) != -1)
errx(1, "pwrite with wrapping offset succeeded,\
returning %d", ret);
if (errno != EFBIG && errno != EINVAL)
err(1, "pwrite with wrapping offset");
/* pwrite should be unaffected by O_APPEND */
if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_APPEND))
err(1, "fcntl");
if (pwrite(fd, &magic[2], 3, 2) != 3)
err(1, "pwrite");
if (pread(fd, buf, 10, 0) != 10)
err(1, "pread");
if (memcmp(buf, "0023425400", 10) != 0)
errx(1, "data mismatch: %s != %s", buf, "0023425400");
close(fd);
/* also, verify that pwrite fails on ttys */
fd = open("/dev/tty", O_RDWR);
if (fd < 0)
printf("skipping tty test\n");
else if ((ret = pwrite(fd, &c, 1, 7)) != -1)
errx(1, "pwrite succeeded on tty, returning %d", ret);
else if (errno != ESPIPE)
err(1, "pwrite");
return 0;
}
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