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daemon/zero: don't ignore write and close errors

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* daemon/zero.c (do_zero): Detect write and close errors.
This commit is contained in:
Jim Meyering
2009-08-17 09:38:50 +02:00
parent ff2f3fc656
commit 5a9b41ed44
1 changed files with 13 additions and 3 deletions
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16
daemon/zero.c
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@@ -41,10 +41,20 @@ do_zero (const char *device)
memset (buf, 0, sizeof buf);
int err = 0;
int saved_errno = 0;
for (i = 0; i < 32; ++i)
(void) write (fd, buf, sizeof buf);
if (write (fd, buf, sizeof buf) != sizeof buf) {
saved_errno = errno;
err = -1;
}
close (fd);
if (close (fd) && saved_errno == 0) {
saved_errno = errno;
err = -1;
}
return 0;
if (saved_errno)
errno = saved_errno;
return err;
}