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glib-unix: Add test to make sure g_unix_open_pipe will intrude standard range

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Now that we know it's a bad idea to avoid the standard io fd range
when getting pipe fds for g_unix_open_pipe, we should test to make sure
we don't inadvertently try to do it again.

This commit adds that test.
This commit is contained in:
Ray Strode 2022-10-31 09:17:55 -04:00
parent 2a36bb4b7e
commit 1c1c452ff2
1 changed files with 41 additions and 0 deletions
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41
glib/tests/unix.c
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@ -24,8 +24,11 @@
#include "config.h"
#include "glib-unix.h"
#include "gstdio.h"
#include <string.h>
#include <pwd.h>
#include <unistd.h>
static void
test_pipe (void)
@ -52,6 +55,43 @@ test_pipe (void)
g_assert (g_str_has_prefix (buf, "hello"));
}
static void
test_pipe_stdio_overwrite (void)
{
GError *error = NULL;
int pipefd[2], ret;
gboolean res;
int stdin_fd;
g_test_summary ("Test that g_unix_open_pipe() will use the first available FD, even if it’s stdin/stdout/stderr");
g_test_bug ("https://gitlab.gnome.org/GNOME/glib/-/issues/2795");
stdin_fd = dup (STDIN_FILENO);
g_assert_cmpint (stdin_fd, >, 0);
g_close (STDIN_FILENO, &error);
g_assert_no_error (error);
res = g_unix_open_pipe (pipefd, FD_CLOEXEC, &error);
g_assert_no_error (error);
g_assert_true (res);
g_assert_cmpint (pipefd[0], ==, STDIN_FILENO);
g_close (pipefd[0], &error);
g_assert_no_error (error);
g_close (pipefd[1], &error);
g_assert_no_error (error);
ret = dup2 (stdin_fd, STDIN_FILENO);
g_assert_cmpint (ret, >=, 0);
g_close (stdin_fd, &error);
g_assert_no_error (error);
}
static void
test_error (void)
{
@ -337,6 +377,7 @@ main (int argc,
g_test_init (&argc, &argv, NULL);
g_test_add_func ("/glib-unix/pipe", test_pipe);
g_test_add_func ("/glib-unix/pipe-stdio-overwrite", test_pipe_stdio_overwrite);
g_test_add_func ("/glib-unix/error", test_error);
g_test_add_func ("/glib-unix/nonblocking", test_nonblocking);
g_test_add_func ("/glib-unix/sighup", test_sighup);