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cosmopolitan/test/libc/calls/open_test.c
Justine Tunney 791f79fcb3
Make improvements 
- We now serialize the file descriptor table when spawning / executing
  processes on Windows. This means you can now inherit more stuff than
  just standard i/o. It's needed by bash, which duplicates the console
  to file descriptor #255. We also now do a better job serializing the
  environment variables, so you're less likely to encounter E2BIG when
  using your bash shell. We also no longer coerce environ to uppercase

- execve() on Windows now remotely controls its parent process to make
  them spawn a replacement for itself. Then it'll be able to terminate
  immediately once the spawn succeeds, without having to linger around
  for the lifetime as a shell process for proxying the exit code. When
  process worker thread running in the parent sees the child die, it's
  given a handle to the new child, to replace it in the process table.

- execve() and posix_spawn() on Windows will now provide CreateProcess
  an explicit handle list. This allows us to remove handle locks which
  enables better fork/spawn concurrency, with seriously correct thread
  safety. Other codebases like Go use the same technique. On the other
  hand fork() still favors the conventional WIN32 inheritence approach
  which can be a little bit messy, but is *controlled* by guaranteeing
  perfectly clean slates at both the spawning and execution boundaries

- sigset_t is now 64 bits. Having it be 128 bits was a mistake because
  there's no reason to use that and it's only supported by FreeBSD. By
  using the system word size, signal mask manipulation on Windows goes
  very fast. Furthermore @asyncsignalsafe funcs have been rewritten on
  Windows to take advantage of signal masking, now that it's much more
  pleasant to use.

- All the overlapped i/o code on Windows has been rewritten for pretty
  good signal and cancelation safety. We're now able to ensure overlap
  data structures are cleaned up so long as you don't longjmp() out of
  out of a signal handler that interrupted an i/o operation. Latencies
  are also improved thanks to the removal of lots of "busy wait" code.
  Waits should be optimal for everything except poll(), which shall be
  the last and final demon we slay in the win32 i/o horror show.

- getrusage() on Windows is now able to report RUSAGE_CHILDREN as well
  as RUSAGE_SELF, thanks to aggregation in the process manager thread.
2023-10-08 08:59:53 -07:00

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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/stat.h"
#include "libc/calls/struct/timespec.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/macros.internal.h"
#include "libc/mem/gc.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/consts/f.h"
#include "libc/sysv/consts/fd.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/s.h"
#include "libc/testlib/subprocess.h"
#include "libc/testlib/testlib.h"
#include "libc/x/x.h"
#include "libc/x/xasprintf.h"
#define abs(rel) gc(xasprintf("%s/%s", gc(getcwd(0, 0)), rel))
void SetUpOnce(void) {
testlib_enable_tmp_setup_teardown();
ASSERT_SYS(0, 0, pledge("stdio rpath wpath cpath fattr proc id", 0));
}
TEST(open, efault) {
ASSERT_SYS(EFAULT, -1, open(0, O_RDONLY));
if (IsWindows() || !IsAsan()) return; // not possible
ASSERT_SYS(EFAULT, -1, open((void *)77, O_RDONLY));
}
TEST(open, enoent) {
ASSERT_SYS(ENOENT, -1, open("", O_RDONLY));
ASSERT_SYS(ENOENT, -1, open("doesnotexist", O_RDONLY));
ASSERT_SYS(ENOENT, -1, open("o/doesnotexist", O_RDONLY));
}
TEST(open, enotdir) {
ASSERT_SYS(0, 0, touch("o", 0644));
ASSERT_SYS(ENOTDIR, -1, open("o/", O_RDONLY));
ASSERT_SYS(ENOTDIR, -1, open("o/.", O_RDONLY));
ASSERT_SYS(ENOTDIR, -1, open("o/./", O_RDONLY));
ASSERT_SYS(ENOTDIR, -1, open("o/doesnotexist", O_RDONLY));
}
TEST(open, eexist) {
ASSERT_SYS(0, 0, touch("exists", 0644));
ASSERT_SYS(EEXIST, -1, open("exists", O_WRONLY | O_CREAT | O_EXCL, 0644));
}
TEST(open, doubleSlash_worksAndGetsNormalizedOnWindows) {
ASSERT_SYS(0, 0, mkdir("o", 0755));
ASSERT_SYS(0, 3,
open(gc(xjoinpaths(gc(getcwd(0, 0)), "o//deleteme")),
O_WRONLY | O_CREAT | O_TRUNC, 0644));
ASSERT_SYS(0, 0, close(3));
}
TEST(open, fdWillBeInheritedByExecutedPrograms) {
ASSERT_SYS(0, 3, open("x", O_RDWR | O_CREAT | O_TRUNC, 0666));
ASSERT_SYS(0, 0, fcntl(3, F_GETFD));
ASSERT_SYS(0, 0, close(3));
}
TEST(open, fdWillBeClosedByExecveAutomatically) {
ASSERT_SYS(0, 3, open("x", O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0666));
ASSERT_SYS(0, FD_CLOEXEC, fcntl(3, F_GETFD));
ASSERT_SYS(0, 0, close(3));
}
TEST(open, enametoolong) {
size_t n = 260;
char *s = gc(xcalloc(1, n + 1));
memset(s, 'J', n);
ASSERT_SYS(ENAMETOOLONG, -1, creat(s, 0644));
}
TEST(open, testSpaceInFilename) {
char buf[8] = {0};
ASSERT_SYS(0, 0, xbarf("hello txt", "hello", -1));
ASSERT_SYS(0, 3, open("hello txt", O_WRONLY));
EXPECT_SYS(0, 1, write(3, "H", 1));
EXPECT_SYS(0, 0, close(3));
ASSERT_SYS(0, 3, open("hello txt", O_RDONLY));
EXPECT_SYS(0, 5, read(3, buf, 7));
EXPECT_STREQ("Hello", buf);
EXPECT_SYS(0, 0, close(3));
}
TEST(open, testOpenExistingForWriteOnly_seeksToStart) {
char buf[8] = {0};
ASSERT_SYS(0, 0, xbarf("hello.txt", "hello", -1));
ASSERT_SYS(0, 3, open("hello.txt", O_WRONLY));
EXPECT_SYS(0, 1, write(3, "H", 1));
EXPECT_SYS(0, 0, close(3));
ASSERT_SYS(0, 3, open("hello.txt", O_RDONLY));
EXPECT_SYS(0, 5, read(3, buf, 7));
EXPECT_STREQ("Hello", buf);
EXPECT_SYS(0, 0, close(3));
}
TEST(open, testOpenExistingForReadWrite_seeksToStart) {
char buf[8] = {0};
ASSERT_SYS(0, 0, xbarf("hello.txt", "hello", -1));
ASSERT_SYS(0, 3, open("hello.txt", O_RDWR));
EXPECT_SYS(0, 1, write(3, "H", 1));
EXPECT_SYS(0, 0, close(3));
ASSERT_SYS(0, 3, open("hello.txt", O_RDONLY));
EXPECT_SYS(0, 5, read(3, buf, 7));
EXPECT_STREQ("Hello", buf);
EXPECT_SYS(0, 0, close(3));
}
TEST(open, testOpenExistingForAppendWriteOnly_seeksToEnd) {
char buf[16] = {0};
ASSERT_SYS(0, 0, xbarf("hello.txt", "hell", -1));
ASSERT_SYS(0, 3, open("hello.txt", O_WRONLY | O_APPEND));
EXPECT_SYS(EBADF, -1, pread(3, buf, 4, 0)); // in O_WRONLY mode
EXPECT_SYS(0, 1, write(3, "o", 1));
EXPECT_SYS(0, 0, lseek(3, 0, SEEK_SET));
EXPECT_SYS(0, 1, write(3, "!", 1));
EXPECT_SYS(0, 0, close(3));
ASSERT_SYS(0, 3, open("hello.txt", O_RDONLY));
EXPECT_SYS(0, 6, read(3, buf, 8));
EXPECT_STREQ("hello!", buf);
EXPECT_SYS(0, 0, close(3));
}
TEST(open, appendRwMode_readsStartZero_writesAlwaysEof) {
char buf[8] = {0};
ASSERT_SYS(0, 0, xbarf("hello.txt", "hell", -1));
ASSERT_SYS(0, 3, open("hello.txt", O_RDWR | O_APPEND));
ASSERT_SYS(0, 2, read(3, buf, 2));
ASSERT_SYS(0, 2, read(3, buf + 2, 2));
EXPECT_STREQ("hell", buf);
EXPECT_SYS(0, 2, write(3, "o!", 2));
ASSERT_SYS(0, 6, pread(3, buf, 8, 0));
EXPECT_STREQ("hello!", buf);
EXPECT_SYS(0, 0, close(3));
}
TEST(open, appendReadOnlyMode_appendIsIgnored) {
char buf[8] = {0};
ASSERT_SYS(0, 0, xbarf("hello.txt", "hell", -1));
ASSERT_SYS(0, 3, open("hello.txt", O_RDONLY | O_APPEND));
EXPECT_SYS(EBADF, -1, write(3, "o!", 2)); // due to O_RDONLY
ASSERT_EQ(0, errno);
ASSERT_SYS(0, 2, read(3, buf, 2));
ASSERT_SYS(0, 2, read(3, buf + 2, 2));
EXPECT_STREQ("hell", buf);
ASSERT_SYS(0, 4, pread(3, buf, 4, 0));
EXPECT_SYS(0, 0, close(3));
}
TEST(open, truncReadWriteMode_getsTruncated) {
char buf[8] = {0};
ASSERT_FALSE(fileexists("hello.txt"));
ASSERT_SYS(ENOENT, -1, open("hello.txt", O_RDWR | O_TRUNC));
ASSERT_SYS(ENOENT, -1, open("hello.txt/there", O_RDWR | O_TRUNC));
ASSERT_SYS(0, 0, xbarf("hello.txt", "hell", -1));
ASSERT_SYS(ENOTDIR, -1, open("hello.txt/there", O_RDWR | O_TRUNC));
ASSERT_SYS(0, 3, open("hello.txt", O_RDWR | O_TRUNC));
ASSERT_SYS(0, 0, read(3, buf, 8));
EXPECT_STREQ("", buf);
ASSERT_SYS(0, 8, write(3, buf, 8));
EXPECT_SYS(0, 0, close(3));
}
TEST(open, truncReadOnlyMode_wontTruncate) {
ASSERT_SYS(EINVAL, -1, open("hello.txt", O_RDONLY | O_TRUNC));
}
TEST(open, testRelativePath_opensRelativeToDirFd) {
ASSERT_SYS(0, 0, mkdir("foo", 0755));
ASSERT_SYS(0, 3, open("foo", O_RDONLY | O_DIRECTORY));
EXPECT_SYS(0, 4, openat(3, "bar", O_WRONLY | O_TRUNC | O_CREAT, 0755));
EXPECT_TRUE(fileexists("foo/bar"));
EXPECT_SYS(0, 0, close(4));
EXPECT_SYS(0, 0, close(3));
}
TEST(open, eloop) {
ASSERT_SYS(0, 0, symlink("froot", "link"));
ASSERT_TRUE(issymlink("link"));
ASSERT_SYS(ELOOP, -1, open("link", O_RDONLY | O_NOFOLLOW));
}
TEST(open, norm) {
ASSERT_SYS(0, 0, mkdir("fun", 0755));
ASSERT_SYS(0, 0, mkdir("fun/house", 0755));
ASSERT_SYS(0, 0, touch("fun/house/norm", 0644));
ASSERT_SYS(0, 3, open("fun//house//norm", O_RDONLY));
ASSERT_SYS(0, 0, close(3));
ASSERT_SYS(0, 3, open(abs("fun//house//norm"), O_RDONLY));
ASSERT_SYS(0, 0, close(3));
ASSERT_SYS(0, 3, open("fun//house/./norm", O_RDONLY));
ASSERT_SYS(0, 0, close(3));
ASSERT_SYS(0, 3, open(abs("fun//house/./norm"), O_RDONLY));
ASSERT_SYS(0, 0, close(3));
ASSERT_SYS(0, 3, open("fun//house/../house/norm", O_RDONLY));
ASSERT_SYS(0, 0, close(3));
ASSERT_SYS(0, 3, open(abs("fun//house/../house/norm"), O_RDONLY));
ASSERT_SYS(0, 0, close(3));
ASSERT_SYS(ENOTDIR, -1, open("fun//house//norm/", O_RDONLY));
ASSERT_SYS(ENOTDIR, -1, open("fun//house//norm/.", O_RDONLY));
ASSERT_SYS(ENOTDIR, -1, open("fun//house//norm/./", O_RDONLY));
ASSERT_SYS(0, 3, open("fun//house//", O_RDONLY | O_DIRECTORY));
ASSERT_SYS(0, 0, close(3));
}
TEST(open, longNormDot) {
if (IsWindows()) return; // todo: why won't long paths work on windows
#define NAME \
"funfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfu" \
"nfunfunfunfunfunfunnfunfunfunfunfunfunnfunfunfunfunfunfununfunfunfunfunfun"
ASSERT_SYS(0, 0, mkdir(NAME, 0755));
ASSERT_SYS(0, 0, mkdir(abs(NAME "/" NAME), 0755));
ASSERT_SYS(0, 3, creat(abs(NAME "//" NAME "/./norm"), 0644));
ASSERT_TRUE(fileexists(abs(NAME "//" NAME "/norm")));
ASSERT_SYS(0, 0, close(3));
}
TEST(open, longNormDotDot) {
if (IsWindows()) return; // todo: why won't long paths work on windows
#define NAME \
"funfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfunfu" \
"nfunfunfunfunfunfunnfunfunfunfunfunfunnfunfunfunfunfunfununfunfunfunfunfun"
ASSERT_SYS(0, 0, mkdir(NAME, 0755));
ASSERT_SYS(0, 0, mkdir(abs(NAME "/" NAME), 0755));
ASSERT_SYS(0, 0, mkdir(abs(NAME "/" NAME "/" NAME), 0755));
ASSERT_SYS(0, 3, creat(abs(NAME "//" NAME "//" NAME "/../norm"), 0644));
ASSERT_TRUE(fileexists(abs(NAME "//" NAME "/norm")));
ASSERT_SYS(0, 0, close(3));
}
TEST(open, creat_directory) {
ASSERT_SYS(ENOENT, -1, open("fun", O_WRONLY | O_DIRECTORY));
ASSERT_FALSE(fileexists("fun"));
if (1) return; // linux 5.15.122-0-lts creates file and returns error D:
ASSERT_SYS(ENOTDIR, -1, open("fun", O_CREAT | O_WRONLY | O_DIRECTORY, 0644));
ASSERT_TRUE(fileexists("fun"));
}
TEST(open, O_DIRECTORY_preventsOpeningRegularFiles) {
ASSERT_SYS(0, 0, touch("file", 0644));
ASSERT_SYS(ENOTDIR, -1, open("file", O_WRONLY | O_DIRECTORY));
}
TEST(open, O_DIRECTORY_isNotARequirementToOpenDirectory) {
ASSERT_SYS(0, 0, mkdir("dir", 0755));
ASSERT_SYS(0, 3, open("dir", O_RDONLY));
ASSERT_SYS(0, 0, close(3));
}
TEST(open, openExistingDirectoryForWriting_raisesError) {
ASSERT_SYS(0, 0, mkdir("dir", 0755));
ASSERT_SYS(EISDIR, -1, open("dir", O_WRONLY));
}
TEST(open, nameWithControlCode) {
if (IsWindows()) {
ASSERT_SYS(EINVAL, -1, touch("hi\1there", 0755));
} else {
ASSERT_SYS(0, 0, touch("hi\1there", 0755));
}
}
TEST(open, nameWithOverlongNul_doesntCreateTruncatedName) {
if (IsXnu() || IsWindows()) {
// XNU is the only one that thought to restrict this. XNU chose
// EILSEQ which makes the most sense. Linux says it'll raise EINVAL
// if invalid characters are detected. Not sure yet which characters
// those are. POSIX says nothing about invalid charaters in open.
ASSERT_SYS(EILSEQ, -1, touch("hi\300\200there", 0755));
} else {
ASSERT_SYS(0, 0, touch("hi\300\200there", 0755));
ASSERT_TRUE(fileexists("hi\300\200there"));
ASSERT_FALSE(fileexists("hi"));
}
}
int CountFds(void) {
int i, count;
for (count = i = 0; i < g_fds.n; ++i) {
if (g_fds.p[i].kind) {
++count;
}
}
return count;
}
TEST(open, lotsOfFds) {
if (!IsWindows()) return;
int i, n = 200;
ASSERT_SYS(0, 0, xbarf("hello.txt", "hello", -1));
for (i = 3; i < n; ++i) {
EXPECT_EQ(i, CountFds());
EXPECT_SYS(0, i, open("hello.txt", O_RDONLY));
}
for (i = 3; i < n; ++i) {
EXPECT_SYS(0, 0, close(i));
}
}
static int64_t GetInode(const char *path) {
struct stat st;
ASSERT_SYS(0, 0, stat(path, &st));
return st.st_ino;
}
TEST(open, drive) {
if (!IsWindows()) return;
ASSERT_NE(GetInode("/"), GetInode("."));
ASSERT_EQ(GetInode("/"), GetInode("/c")); // sorry you have to run on c:/
ASSERT_EQ(GetInode("/"), GetInode("/c/"));
ASSERT_SYS(0, 3, open("/", O_RDONLY));
ASSERT_SYS(0, 0, close(3));
}
TEST(open, readOnlyCreatMode) {
char buf[8];
struct stat st;
ASSERT_SYS(0, 3, open("x", O_RDWR | O_CREAT | O_TRUNC, 0500));
ASSERT_SYS(0, 2, pwrite(3, "MZ", 2, 0));
ASSERT_SYS(0, 2, pread(3, buf, 8, 0));
ASSERT_SYS(0, 0, close(3));
ASSERT_SYS(0, 0, stat("x", &st));
ASSERT_EQ(0100500, st.st_mode);
if (getuid()) {
ASSERT_SYS(EACCES, -1, open("x", O_RDWR));
ASSERT_SYS(EACCES, -1, open("x", O_RDWR | O_CREAT));
} else {
// root is invulnerable to eacces
ASSERT_SYS(0, 3, open("x", O_RDWR));
ASSERT_SYS(0, 0, close(3));
ASSERT_SYS(0, 3, open("x", O_RDWR | O_CREAT));
ASSERT_SYS(0, 0, close(3));
SPAWN(fork);
setuid(1000);
setgid(1000);
ASSERT_SYS(EACCES, -1, open("x", O_RDWR));
ASSERT_SYS(EACCES, -1, open("x", O_RDWR | O_CREAT));
EXITS(0);
}
}
TEST(open, parentSymlink) {
struct stat st;
ASSERT_SYS(0, 0, mkdir("parent", 0755));
// create directory symlink
ASSERT_SYS(0, 0, symlink("parent", "parent-link"));
// test the symlink we just made is a symlink
ASSERT_SYS(0, 0, lstat("parent-link", &st));
ASSERT_TRUE(S_ISLNK(st.st_mode));
// create regular file when parent component is symlink dir
ASSERT_SYS(0, 0, touch("parent-link/regular", 0644));
// test stat works
ASSERT_SYS(0, 0, stat("parent-link/regular", &st));
ASSERT_TRUE(S_ISREG(st.st_mode));
// test open works
ASSERT_SYS(0, 3, open("parent-link/regular", O_RDONLY));
ASSERT_SYS(0, 0, fstat(3, &st));
ASSERT_TRUE(S_ISREG(st.st_mode));
ASSERT_SYS(0, 0, close(3));
// test O_NOFOLLOW doesn't apply to parent components
ASSERT_SYS(0, 3, open("parent-link/regular", O_RDONLY | O_NOFOLLOW));
ASSERT_SYS(0, 0, fstat(3, &st));
ASSERT_TRUE(S_ISREG(st.st_mode));
ASSERT_SYS(0, 0, close(3));
// create regular symlink
ASSERT_SYS(0, 0, symlink("regular", "parent-link/regular-link"));
// test stat works
ASSERT_SYS(0, 0, stat("parent-link/regular-link", &st));
ASSERT_TRUE(S_ISREG(st.st_mode));
ASSERT_SYS(0, 0, lstat("parent-link/regular-link", &st));
ASSERT_TRUE(S_ISLNK(st.st_mode));
// test open works
ASSERT_SYS(0, 3, open("parent-link/regular-link", O_RDONLY));
ASSERT_SYS(0, 0, fstat(3, &st));
ASSERT_TRUE(S_ISREG(st.st_mode));
ASSERT_SYS(0, 0, close(3));
// test O_NOFOLLOW applies to last component
ASSERT_SYS(ELOOP, -1,
open("parent-link/regular-link", O_RDONLY | O_NOFOLLOW));
}
TEST(open, readonlyCreateMode_dontChangeStatusIfExists) {
char buf[8];
struct stat st;
ASSERT_SYS(0, 3, creat("wut", 0700));
ASSERT_SYS(0, 2, pwrite(3, "MZ", 2, 0));
ASSERT_SYS(0, 0, close(3));
// since the file already exists, unix doesn't change read-only
ASSERT_SYS(0, 3, open("wut", O_CREAT | O_TRUNC | O_RDWR, 0500));
ASSERT_SYS(0, 0, pread(3, buf, 8, 0));
ASSERT_SYS(0, 0, fstat(3, &st));
ASSERT_EQ(0100600, st.st_mode & 0700666);
ASSERT_SYS(0, 0, close(3));
}
TEST(open, creatRdonly) {
char buf[8];
ASSERT_SYS(EINVAL, -1, open("foo", O_CREAT | O_TRUNC | O_RDONLY, 0700));
ASSERT_SYS(0, 3, open("foo", O_CREAT | O_RDONLY, 0700));
ASSERT_SYS(EBADF, -1, pwrite(3, "MZ", 2, 0));
ASSERT_SYS(0, 0, pread(3, buf, 8, 0));
ASSERT_SYS(0, 0, close(3));
}
TEST(open, sequentialRandom_EINVAL) {
if (!IsWindows()) return;
ASSERT_SYS(
EINVAL, -1,
open("foo", O_CREAT | O_TRUNC | O_RDWR | O_SEQUENTIAL | O_RANDOM, 0700));
}
// "If O_CREAT is set and the file did not previously exist, upon
// successful completion, open() shall mark for update the last data
// access, last data modification, and last file status change
// timestamps of the file and the last data modification and last
// file status change timestamps of the parent directory." -POSIX
TEST(open, creatFile_touchesDirectory) {
if (1) return; // TODO(jart): explain the rare flakes
struct stat st;
struct timespec birth;
ASSERT_SYS(0, 0, mkdir("dir", 0755));
ASSERT_SYS(0, 0, stat("dir", &st));
birth = st.st_ctim;
// check we can read time without changing it
sleep(2);
ASSERT_SYS(0, 0, stat("dir", &st));
EXPECT_EQ(0, timespec_cmp(st.st_ctim, birth));
EXPECT_EQ(0, timespec_cmp(st.st_mtim, birth));
EXPECT_EQ(0, timespec_cmp(st.st_atim, birth));
// check that the directory time changes when file is made
sleep(2);
ASSERT_SYS(0, 0, touch("dir/file", 0644));
ASSERT_SYS(0, 0, stat("dir", &st));
EXPECT_EQ(1, timespec_cmp(st.st_ctim, birth));
EXPECT_EQ(1, timespec_cmp(st.st_mtim, birth));
// TODO: Maybe statfs() for noatime / relative?
// EXPECT_EQ(1, timespec_cmp(st.st_atim, birth));
}
// "If O_TRUNC is set and the file did previously exist, upon successful
// completion, open() shall mark for update the last data modification
// and last file status change timestamps of the file." -POSIX
TEST(open, trunc_touchesMtimCtim) {
struct stat st;
struct timespec birth;
ASSERT_SYS(0, 0, touch("regular", 0755));
ASSERT_SYS(0, 0, stat("regular", &st));
birth = st.st_ctim;
sleep(2);
ASSERT_SYS(0, 3, open("regular", O_RDWR | O_TRUNC));
ASSERT_SYS(0, 0, fstat(3, &st));
EXPECT_EQ(1, timespec_cmp(st.st_ctim, birth));
EXPECT_EQ(1, timespec_cmp(st.st_mtim, birth));
ASSERT_SYS(0, 0, close(3));
}
TEST(open, mereOpen_doesntTouch) {
struct stat st;
struct timespec birth;
ASSERT_SYS(0, 0, touch("regular", 0755));
ASSERT_SYS(0, 0, stat("regular", &st));
birth = st.st_ctim;
sleep(2);
ASSERT_SYS(0, 3, open("regular", O_RDWR));
ASSERT_SYS(0, 0, close(3));
ASSERT_SYS(0, 0, stat("regular", &st));
EXPECT_EQ(0, timespec_cmp(st.st_ctim, birth));
EXPECT_EQ(0, timespec_cmp(st.st_mtim, birth));
EXPECT_EQ(0, timespec_cmp(st.st_atim, birth));
}
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