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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
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*
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* Mock version of dbus-launch, for gdbus-unix-addresses test
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*
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* Copyright © 2015 Collabora Ltd.
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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
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <glib.h>
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#ifndef G_OS_UNIX
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#error This is a Unix-specific test helper
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#endif
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#define ME "GDBus mock version of dbus-launch"
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static void
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write_all (const void *ptr,
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size_t len)
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{
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const char *p = ptr;
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while (len > 0)
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{
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ssize_t done = write (STDOUT_FILENO, p, len);
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int errsv = errno;
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if (done == 0)
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{
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g_error ("%s: write: EOF", ME);
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}
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else if (done < 0)
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{
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if (errsv == EINTR)
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continue;
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g_error ("%s: write: %s", ME, g_strerror (errsv));
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}
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else
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{
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if (len < (size_t) done)
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g_error ("%s: wrote too many bytes?", ME);
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len -= done;
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p += done;
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}
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}
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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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pid_t pid = 0x2323;
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long window_id = 0x42424242;
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const char *addr = "hello:this=address-is-from-the,mock=dbus-launch";
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write_all (addr, strlen (addr) + 1);
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write_all (&pid, sizeof (pid));
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write_all (&window_id, sizeof (window_id));
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return 0;
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}
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