mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-04-27 14:58:46 +00:00
58 lines
2 KiB
C++
58 lines
2 KiB
C++
/*
|
|
* Copyright (c) 2021, the SerenityOS developers.
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <LibTest/TestCase.h>
|
|
#include <cstring>
|
|
#include <unistd.h>
|
|
|
|
TEST_CASE(test_process_fd_readlink)
|
|
{
|
|
char expected_link[MAXPATHLEN];
|
|
char buf[MAXPATHLEN];
|
|
|
|
// Read the symlink value for stdin, stdout and stderr
|
|
auto link_length = readlink("/proc/self/fd/0", expected_link, sizeof(expected_link));
|
|
expected_link[link_length] = '\0';
|
|
|
|
link_length = readlink("/proc/self/fd/1", buf, sizeof(buf));
|
|
buf[link_length] = '\0';
|
|
EXPECT_EQ(0, strcmp(buf, expected_link));
|
|
|
|
link_length = readlink("/proc/self/fd/2", buf, sizeof(buf));
|
|
buf[link_length] = '\0';
|
|
EXPECT_EQ(0, strcmp(buf, expected_link));
|
|
|
|
// Create a new file descriptor that is a dup of 0 with various big values in order to reproduce issue #7820.
|
|
// We should get the same link value for each fd that was duplicated.
|
|
|
|
// 255 is the first broken file descriptor that was discovered and might be used by other software (e.g. bash)
|
|
auto new_fd = dup2(0, 255);
|
|
EXPECT_EQ(new_fd, 255);
|
|
link_length = readlink("/proc/self/fd/255", buf, sizeof(buf));
|
|
buf[link_length] = '\0';
|
|
EXPECT_EQ(0, strcmp(buf, expected_link));
|
|
|
|
// 215 is the last fd before we have to encode the fd using more than one byte (due to the offset by FI_MaxStaticFileIndex)
|
|
new_fd = dup2(0, 215);
|
|
EXPECT_EQ(new_fd, 215);
|
|
link_length = readlink("/proc/self/fd/215", buf, sizeof(buf));
|
|
buf[link_length] = '\0';
|
|
EXPECT_EQ(0, strcmp(buf, expected_link));
|
|
|
|
// 216 is the first fd that is encoded using more than one byte
|
|
new_fd = dup2(0, 216);
|
|
EXPECT_EQ(new_fd, 216);
|
|
link_length = readlink("/proc/self/fd/216", buf, sizeof(buf));
|
|
buf[link_length] = '\0';
|
|
EXPECT_EQ(0, strcmp(buf, expected_link));
|
|
|
|
// 1023 is the largest possible file descriptor
|
|
new_fd = dup2(0, 1023);
|
|
EXPECT_EQ(new_fd, 1023);
|
|
link_length = readlink("/proc/self/fd/1023", buf, sizeof(buf));
|
|
buf[link_length] = '\0';
|
|
EXPECT_EQ(0, strcmp(buf, expected_link));
|
|
}
|