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tests: Call openpty (if available) without using dlsym

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The SONAME of libutil varies between architectures, so the logic to find
the SONAME of libutil was only correct for native builds (Linux on
Linux), not for cross-builds. The regular expression was also not
sufficiently broad to match the SONAME used on the alpha architecture,
which is apparently libutil.so.1.1.

Instead of screen-scraping the output of ldconfig and using that to
dlopen the library that contains openpty, it seems more reliable to
emit a link-time reference to openpty and let the linker do its job.
It's also less code.

Bug-Debian: https://bugs.debian.org/1007946
Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2022-03-19 11:16:46 +00:00
parent c5e12d9577
commit 1726e150f4
2 changed files with 28 additions and 36 deletions
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28
gio/tests/meson.build
View File

@ -12,20 +12,20 @@ test_c_args = [
'-UG_DISABLE_ASSERT',
]
# workaround for https://github.com/mesonbuild/meson/issues/6880
if build_machine.system() == 'linux'
libutil_name = 'libutil'
libutil = run_command('sh', '-c',
'''ldconfig -p | grep -o "[[:space:]]@0@\.so\(\.[0-9]\+\)\?\b"'''
.format(libutil_name), check: false).stdout().strip().split('\n')
libutil_dep = dependency('', required : false)
if libutil.length() > 0
message('Found libutil as @0@'.format(libutil[0]))
test_c_args += '-DLIBUTIL_SONAME="@0@"'.format(libutil[0])
else
warning('libutil not found')
endif # libutil.length() > 0
endif # build_machine.system() == 'linux'
if cc.has_header('pty.h')
have_openpty = cc.has_function('openpty', prefix : '#include <pty.h>')
if host_machine.system() == 'linux' and not have_openpty
libutil_dep = cc.find_library('util', required : false)
have_openpty = cc.has_function('openpty', dependencies : libutil_dep, prefix : '#include <pty.h>')
endif
if have_openpty
test_c_args += '-DHAVE_OPENPTY'
endif
endif
if host_machine.system() == 'windows'
common_gio_tests_deps += [iphlpapi_dep, winsock2, cc.find_library ('secur32')]
@ -91,7 +91,7 @@ gio_tests = {
'network-monitor' : {},
'network-monitor-race' : {},
'permission' : {},
'pollable' : {'dependencies' : [libdl_dep]},
'pollable' : {'dependencies' : [libutil_dep]},
'power-profile-monitor' : {},
'proxy-test' : {},
'readwrite' : {},

36
gio/tests/pollable.c
View File

@ -22,12 +22,20 @@
#include <glib/gstdio.h>
#ifdef G_OS_UNIX
#include <dlfcn.h>
#include <fcntl.h>
#ifdef HAVE_OPENPTY
#include <pty.h>
#endif
#include <gio/gunixinputstream.h>
#include <gio/gunixoutputstream.h>
#endif
/* openpty() is non-standard and might not be available on all kernels
* and libc implementations, but glibc on Linux definitely has it */
#if defined(__linux__) && defined(__GNUC__) && !defined(HAVE_OPENPTY)
#error Should have been able to find openpty on GNU/Linux
#endif
GMainLoop *loop;
GPollableInputStream *in;
GOutputStream *out;
@ -185,31 +193,19 @@ test_pollable_unix_pipe (void)
static void
test_pollable_unix_pty (void)
{
int (*openpty_impl) (int *, int *, char *, void *, void *);
#ifdef HAVE_OPENPTY
int a, b, status;
#ifdef LIBUTIL_SONAME
void *handle;
#endif
g_test_summary ("Test that PTYs are considered pollable");
#ifdef LIBUTIL_SONAME
handle = dlopen (LIBUTIL_SONAME, RTLD_GLOBAL | RTLD_LAZY);
g_assert_nonnull (handle);
#endif
#ifdef HAVE_OPENPTY
status = openpty (&a, &b, NULL, NULL, NULL);
openpty_impl = dlsym (RTLD_DEFAULT, "openpty");
if (openpty_impl == NULL)
{
g_test_skip ("System does not support openpty()");
goto close_libutil;
}
status = openpty_impl (&a, &b, NULL, NULL, NULL);
if (status == -1)
{
g_test_skip ("Unable to open PTY");
goto close_libutil;
return;
}
in = G_POLLABLE_INPUT_STREAM (g_unix_input_stream_new (a, TRUE));
@ -222,12 +218,8 @@ test_pollable_unix_pty (void)
close (a);
close (b);
close_libutil:
#ifdef LIBUTIL_SONAME
dlclose (handle);
#else
return;
g_test_skip ("openpty not found");
#endif
}