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Rewrite special file handling on Windows

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This change gets GNU grep working. What caused it to not work, is it
wouldn't write to an output file descriptor when its dev/ino equaled
/dev/null's. So now we invent special dev/ino values for these files
This commit is contained in:
Justine Tunney 2023-10-14 01:06:00 -07:00
parent aca2261cda
commit 2db2f40a98
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GPG key ID: BE714B4575D6E328
53 changed files with 485 additions and 299 deletions
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82
test/libc/calls/specialfile_test.c Normal file
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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 2023 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/dce.h"
#include "libc/errno.h"
#include "libc/nt/files.h"
#include "libc/sysv/consts/f.h"
#include "libc/sysv/consts/o.h"
#include "libc/testlib/testlib.h"
int pipefd[2];
int stdoutBack;
void SetUpOnce(void) {
testlib_enable_tmp_setup_teardown();
}
void CaptureStdout(void) {
ASSERT_NE(-1, (stdoutBack = dup(1)));
ASSERT_SYS(0, 0, pipe(pipefd));
ASSERT_NE(-1, dup2(pipefd[1], 1));
}
void RestoreStdout(void) {
ASSERT_SYS(0, 1, dup2(stdoutBack, 1));
ASSERT_SYS(0, 0, close(stdoutBack));
ASSERT_SYS(0, 0, close(pipefd[1]));
ASSERT_SYS(0, 0, close(pipefd[0]));
}
TEST(specialfile, devNull) {
ASSERT_SYS(0, 3, creat("/dev/null", 0644));
ASSERT_EQ(O_WRONLY, fcntl(3, F_GETFL) & ~O_LARGEFILE);
ASSERT_SYS(0, 2, write(3, "hi", 2));
ASSERT_SYS(0, 2, pwrite(3, "hi", 2, 0));
ASSERT_SYS(0, 2, pwrite(3, "hi", 2, 2));
ASSERT_SYS(0, 0, lseek(3, 0, SEEK_END));
ASSERT_SYS(0, 0, lseek(3, 0, SEEK_CUR));
if (!IsLinux()) {
// rhel7 doesn't have this behavior
ASSERT_SYS(0, 2, lseek(3, 2, SEEK_CUR));
ASSERT_SYS(0, 2, lseek(3, 2, SEEK_END));
}
ASSERT_SYS(0, 0, close(3));
}
TEST(specialfile, devNullRead) {
char buf[8] = {0};
ASSERT_SYS(0, 3, open("/dev/null", O_RDONLY));
ASSERT_EQ(O_RDONLY, fcntl(3, F_GETFL) & ~O_LARGEFILE);
ASSERT_SYS(0, 0, read(3, buf, 8));
ASSERT_SYS(0, 0, close(3));
}
TEST(specialfile, devStdout) {
char buf[8] = {8};
CaptureStdout();
ASSERT_SYS(0, 6, creat("/dev/stdout", 0644));
ASSERT_SYS(0, 2, write(6, "hi", 2));
ASSERT_EQ(2, read(pipefd[0], buf, 8));
ASSERT_STREQ("hi", buf);
ASSERT_SYS(ESPIPE, -1, pwrite(6, "hi", 2, 0));
ASSERT_SYS(ESPIPE, -1, lseek(6, 0, SEEK_END));
ASSERT_SYS(0, 0, close(6));
RestoreStdout();
}