int
pipe2_safer (int fd[2], int flags)
{
/* This is a generalization of the pipe_safer implementation. */
if (pipe2 (fd, flags) == 0)
{
int i;
for (i = 0; i < 2; i++)
{
fd[i] = fd_safer_flag (fd[i], flags);
if (fd[i] < 0)
{
int e = errno;
close (fd[1 - i]);
errno = e;
return -1;
}
}
return 0;
}
return -1;
}
/* Like mkostemps, but do not return STDIN_FILENO, STDOUT_FILENO, or
STDERR_FILENO. */
int
mkostemps_safer (char *templ, int suffixlen, int flags)
{
return fd_safer_flag (mkostemps (templ, suffixlen, flags), flags);
}
/* Like mkostemp, but do not return STDIN_FILENO, STDOUT_FILENO, or
STDERR_FILENO. */
int
mkostemp_safer (char *templ, int flags)
{
return fd_safer_flag (mkostemp (templ, flags), flags);
}
int
main (void)
{
int i;
int fd;
/* We close fd 2 later, so save it in fd 10. */
if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
|| (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
return 2;
/* Create file for later checks. */
fd = creat (witness, 0600);
ASSERT (STDERR_FILENO < fd);
/* Four iterations, with progressively more standard descriptors
closed. */
for (i = -1; i <= STDERR_FILENO; i++)
{
if (0 <= i)
ASSERT (close (i) == 0);
/* Detect errors. */
errno = 0;
ASSERT (dup (-1) == -1);
ASSERT (errno == EBADF);
errno = 0;
ASSERT (dup (10000000) == -1);
ASSERT (errno == EBADF);
close (fd + 1);
errno = 0;
ASSERT (dup (fd + 1) == -1);
ASSERT (errno == EBADF);
/* Preserve text vs. binary. */
setmode (fd, O_BINARY);
ASSERT (dup (fd) == fd + 1);
ASSERT (is_open (fd + 1));
ASSERT (is_inheritable (fd + 1));
ASSERT (is_mode (fd + 1, O_BINARY));
ASSERT (close (fd + 1) == 0);
setmode (fd, O_TEXT);
ASSERT (dup (fd) == fd + 1);
ASSERT (is_open (fd + 1));
ASSERT (is_inheritable (fd + 1));
ASSERT (is_mode (fd + 1, O_TEXT));
/* Create cloexec copy. */
ASSERT (close (fd + 1) == 0);
ASSERT (fd_safer_flag (dup_cloexec (fd), O_CLOEXEC) == fd + 1);
ASSERT (set_cloexec_flag (fd + 1, true) == 0);
ASSERT (is_open (fd + 1));
ASSERT (!is_inheritable (fd + 1));
ASSERT (close (fd) == 0);
/* dup always creates inheritable copies. Also, check that
earliest slot past std fds is used. */
ASSERT (dup (fd + 1) == fd);
ASSERT (is_open (fd));
ASSERT (is_inheritable (fd));
ASSERT (close (fd + 1) == 0);
}
/* Cleanup. */
ASSERT (close (fd) == 0);
ASSERT (unlink (witness) == 0);
return 0;
}
