mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 08:02:44 +00:00
44a6715584
If someone runs the test with shell redirection going on, or in a way that changes any of the standard file descriptors this assumption will not hold. When running from a terminal normally, it is true however. Instead, check that /proc/self/fd/[0,1,2] are symlinks, and can be stat-d by verifying that both stat and lstat succeed, and give different struct stat contents.
76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
/*
|
|
* Copyright (c) 2021, the SerenityOS developers.
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <LibTest/TestCase.h>
|
|
#include <cstring>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
|
|
TEST_CASE(test_process_fd_readlink)
|
|
{
|
|
// Make sure that stdin, stdout and stderr are actually symlinks that point somewhere interesting
|
|
// Sadly we can't assume that they all point to the same file.
|
|
struct stat stat_buf = {};
|
|
struct stat lstat_buf = {};
|
|
auto rc = stat("/proc/self/fd/0", &stat_buf);
|
|
EXPECT_EQ(rc, 0);
|
|
rc = lstat("/proc/self/fd/0", &lstat_buf);
|
|
EXPECT_EQ(rc, 0);
|
|
EXPECT_NE(0, memcmp(&stat_buf, &lstat_buf, sizeof(struct stat)));
|
|
|
|
stat_buf = {};
|
|
lstat_buf = {};
|
|
rc = stat("/proc/self/fd/1", &stat_buf);
|
|
EXPECT_EQ(rc, 0);
|
|
rc = lstat("/proc/self/fd/1", &lstat_buf);
|
|
EXPECT_EQ(rc, 0);
|
|
EXPECT_NE(0, memcmp(&stat_buf, &lstat_buf, sizeof(struct stat)));
|
|
|
|
stat_buf = {};
|
|
lstat_buf = {};
|
|
rc = stat("/proc/self/fd/2", &stat_buf);
|
|
EXPECT_EQ(rc, 0);
|
|
rc = lstat("/proc/self/fd/2", &lstat_buf);
|
|
EXPECT_EQ(rc, 0);
|
|
EXPECT_NE(0, memcmp(&stat_buf, &lstat_buf, sizeof(struct stat)));
|
|
|
|
// 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.
|
|
char expected_link[MAXPATHLEN];
|
|
char buf[MAXPATHLEN];
|
|
|
|
// Read the symlink for stdin, stdout and stderr
|
|
auto link_length = readlink("/proc/self/fd/0", expected_link, sizeof(expected_link));
|
|
expected_link[link_length] = '\0';
|
|
|
|
// 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));
|
|
}
|