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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.
77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <cstring>
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#include <sys/stat.h>
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#include <unistd.h>
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TEST_CASE(test_process_fd_readlink)
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{
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// Make sure that stdin, stdout and stderr are actually symlinks that point somewhere interesting
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// Sadly we can't assume that they all point to the same file.
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struct stat stat_buf = {};
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struct stat lstat_buf = {};
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auto rc = stat("/proc/self/fd/0", &stat_buf);
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EXPECT_EQ(rc, 0);
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rc = lstat("/proc/self/fd/0", &lstat_buf);
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EXPECT_EQ(rc, 0);
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EXPECT_NE(0, memcmp(&stat_buf, &lstat_buf, sizeof(struct stat)));
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stat_buf = {};
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lstat_buf = {};
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rc = stat("/proc/self/fd/1", &stat_buf);
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EXPECT_EQ(rc, 0);
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rc = lstat("/proc/self/fd/1", &lstat_buf);
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EXPECT_EQ(rc, 0);
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EXPECT_NE(0, memcmp(&stat_buf, &lstat_buf, sizeof(struct stat)));
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stat_buf = {};
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lstat_buf = {};
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rc = stat("/proc/self/fd/2", &stat_buf);
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EXPECT_EQ(rc, 0);
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rc = lstat("/proc/self/fd/2", &lstat_buf);
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EXPECT_EQ(rc, 0);
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EXPECT_NE(0, memcmp(&stat_buf, &lstat_buf, sizeof(struct stat)));
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// Create a new file descriptor that is a dup of 0 with various big values in order to reproduce issue #7820.
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// We should get the same link value for each fd that was duplicated.
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char expected_link[MAXPATHLEN];
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char buf[MAXPATHLEN];
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// Read the symlink for stdin, stdout and stderr
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auto link_length = readlink("/proc/self/fd/0", expected_link, sizeof(expected_link));
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expected_link[link_length] = '\0';
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// 255 is the first broken file descriptor that was discovered and might be used by other software (e.g. bash)
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auto new_fd = dup2(0, 255);
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EXPECT_EQ(new_fd, 255);
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link_length = readlink("/proc/self/fd/255", buf, sizeof(buf));
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buf[link_length] = '\0';
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EXPECT_EQ(0, strcmp(buf, expected_link));
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// 215 is the last fd before we have to encode the fd using more than one byte (due to the offset by FI_MaxStaticFileIndex)
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new_fd = dup2(0, 215);
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EXPECT_EQ(new_fd, 215);
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link_length = readlink("/proc/self/fd/215", buf, sizeof(buf));
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buf[link_length] = '\0';
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EXPECT_EQ(0, strcmp(buf, expected_link));
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// 216 is the first fd that is encoded using more than one byte
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new_fd = dup2(0, 216);
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EXPECT_EQ(new_fd, 216);
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link_length = readlink("/proc/self/fd/216", buf, sizeof(buf));
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buf[link_length] = '\0';
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EXPECT_EQ(0, strcmp(buf, expected_link));
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// 1023 is the largest possible file descriptor
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new_fd = dup2(0, 1023);
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EXPECT_EQ(new_fd, 1023);
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link_length = readlink("/proc/self/fd/1023", buf, sizeof(buf));
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buf[link_length] = '\0';
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EXPECT_EQ(0, strcmp(buf, expected_link));
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}
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