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5cddde1fb2
Prevent the situation where errno is set by function A, then function B
is called (which is typically _(), but could be anything else) and it
overwrites errno, then errno is checked by the caller.
errno is a horrific API, and we need to be careful to save its value as
soon as a function call (which might set it) returns. i.e. Follow the
pattern:
int errsv, ret;
ret = some_call_which_might_set_errno ();
errsv = errno;
if (ret < 0)
puts (strerror (errsv));
This patch implements that pattern throughout GLib. There might be a few
places in the test code which still use errno directly. They should be
ported as necessary. It doesn’t modify all the call sites like this:
if (some_call_which_might_set_errno () && errno == ESOMETHING)
since the refactoring involved is probably more harmful than beneficial
there. It does, however, refactor other call sites regardless of whether
they were originally buggy.
https://bugzilla.gnome.org/show_bug.cgi?id=785577
298 lines
7.2 KiB
C
298 lines
7.2 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#undef G_DISABLE_ASSERT
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#undef G_LOG_DOMAIN
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#include <glib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef G_OS_WIN32
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#include <fcntl.h>
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#include <io.h>
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#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
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#endif
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static void
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run_tests (void)
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{
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GError *err;
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gchar *output = NULL;
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#ifdef G_OS_WIN32
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gchar *erroutput = NULL;
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int pipedown[2], pipeup[2];
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gchar **argv = 0;
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#endif
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err = NULL;
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if (!g_spawn_command_line_sync ("nonexistent_application foo 'bar baz' blah blah",
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NULL, NULL, NULL,
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&err))
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{
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g_error_free (err);
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}
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else
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{
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g_warning ("no error for sync spawn of nonexistent application");
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exit (1);
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}
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err = NULL;
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if (!g_spawn_command_line_async ("nonexistent_application foo bar baz \"blah blah\"",
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&err))
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{
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g_error_free (err);
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}
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else
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{
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g_warning ("no error for async spawn of nonexistent application");
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exit (1);
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}
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err = NULL;
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#ifdef G_OS_UNIX
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if (!g_spawn_command_line_sync ("/bin/sh -c 'echo hello'",
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&output, NULL, NULL,
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&err))
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{
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fprintf (stderr, "Error: %s\n", err->message);
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g_error_free (err);
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exit (1);
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}
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else
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{
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g_assert (output != NULL);
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if (strcmp (output, "hello\n") != 0)
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{
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printf ("output was '%s', should have been 'hello'\n",
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output);
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exit (1);
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}
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g_free (output);
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}
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#else
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#ifdef G_OS_WIN32
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printf ("Running netstat synchronously, collecting its output\n");
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if (!g_spawn_command_line_sync ("netstat -n",
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&output, &erroutput, NULL,
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&err))
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{
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fprintf (stderr, "Error: %s\n", err->message);
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g_error_free (err);
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exit (1);
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}
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else
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{
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g_assert (output != NULL);
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g_assert (erroutput != NULL);
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if (strstr (output, "Active Connections") == 0)
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{
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printf ("output was '%s', should have contained 'Active Connections'\n",
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output);
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exit (1);
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}
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if (erroutput[0] != '\0')
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{
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printf ("error output was '%s', should have been empty\n",
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erroutput);
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exit (1);
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}
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g_free (output);
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output = NULL;
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g_free (erroutput);
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erroutput = NULL;
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}
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printf ("Running spawn-test-win32-gui in various ways. Click on the OK buttons.\n");
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printf ("First asynchronously (without wait).\n");
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if (!g_spawn_command_line_async ("'.\\spawn-test-win32-gui.exe' 1", &err))
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{
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fprintf (stderr, "Error: %s\n", err->message);
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g_error_free (err);
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exit (1);
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}
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printf ("Now synchronously, collecting its output.\n");
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if (!g_spawn_command_line_sync ("'.\\spawn-test-win32-gui.exe' 2",
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&output, &erroutput, NULL,
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&err))
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{
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fprintf (stderr, "Error: %s\n", err->message);
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g_error_free (err);
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exit (1);
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}
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else
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{
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g_assert (output != NULL);
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g_assert (erroutput != NULL);
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if (strcmp (output, "This is stdout\r\n") != 0)
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{
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printf ("output was '%s', should have been 'This is stdout'\n",
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g_strescape (output, NULL));
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exit (1);
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}
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if (strcmp (erroutput, "This is stderr\r\n") != 0)
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{
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printf ("error output was '%s', should have been 'This is stderr'\n",
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g_strescape (erroutput, NULL));
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exit (1);
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}
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g_free (output);
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g_free (erroutput);
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}
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printf ("Now with G_SPAWN_FILE_AND_ARGV_ZERO.\n");
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if (!g_shell_parse_argv ("'.\\spawn-test-win32-gui.exe' this-should-be-argv-zero nop", NULL, &argv, &err))
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{
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fprintf (stderr, "Error parsing command line? %s\n", err->message);
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g_error_free (err);
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exit (1);
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}
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if (!g_spawn_async (NULL, argv, NULL,
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G_SPAWN_FILE_AND_ARGV_ZERO,
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NULL, NULL, NULL,
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&err))
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{
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fprintf (stderr, "Error: %s\n", err->message);
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g_error_free (err);
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exit (1);
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}
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printf ("Now talking to it through pipes.\n");
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if (pipe (pipedown) < 0 ||
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pipe (pipeup) < 0)
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{
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fprintf (stderr, "Could not create pipes\n");
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exit (1);
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}
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if (!g_shell_parse_argv (g_strdup_printf ("'.\\spawn-test-win32-gui.exe' pipes %d %d",
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pipedown[0], pipeup[1]),
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NULL, &argv,
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&err))
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{
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fprintf (stderr, "Error parsing command line? %s\n", err->message);
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g_error_free (err);
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exit (1);
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}
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if (!g_spawn_async (NULL, argv, NULL,
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G_SPAWN_LEAVE_DESCRIPTORS_OPEN |
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G_SPAWN_DO_NOT_REAP_CHILD,
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NULL, NULL, NULL,
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&err))
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{
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fprintf (stderr, "Error: %s\n", err->message);
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g_error_free (err);
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exit (1);
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}
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else
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{
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int k, n;
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char buf[100];
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if ((k = read (pipeup[0], &n, sizeof (n))) != sizeof (n))
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{
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int errsv = errno;
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if (k == -1)
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fprintf (stderr, "Read error: %s\n", g_strerror (errsv));
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else
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fprintf (stderr, "Wanted to read %d bytes, got %d\n",
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sizeof (n), k);
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exit (1);
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}
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if ((k = read (pipeup[0], buf, n)) != n)
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{
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int errsv = errno;
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if (k == -1)
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fprintf (stderr, "Read error: %s\n", g_strerror (errsv));
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else
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fprintf (stderr, "Wanted to read %d bytes, got %d\n",
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n, k);
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exit (1);
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}
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n = strlen ("Bye then");
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if (write (pipedown[1], &n, sizeof (n)) == -1 ||
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write (pipedown[1], "Bye then", n) == -1)
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{
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int errsv = errno;
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fprintf (stderr, "Write error: %s\n", g_strerror (errsv));
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exit (1);
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}
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if ((k = read (pipeup[0], &n, sizeof (n))) != sizeof (n))
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{
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int errsv = errno;
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if (k == -1)
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fprintf (stderr, "Read error: %s\n", g_strerror (errsv));
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else
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fprintf (stderr, "Wanted to read %d bytes, got %d\n",
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sizeof (n), k);
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exit (1);
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}
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if ((k = read (pipeup[0], buf, n)) != n)
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{
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int errsv = errno;
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if (k == -1)
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fprintf (stderr, "Read error: %s\n", g_strerror (errsv));
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else
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fprintf (stderr, "Wanted to read %d bytes, got %d\n",
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n, k);
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exit (1);
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}
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}
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#endif
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#endif
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}
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int
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main (int argc,
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char *argv[])
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{
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run_tests ();
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return 0;
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}
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