vasilito
068a1ca63e
Bootloader fork rebase:
- Base changed from 0.1.0 pre-patched archive to upstream 1.0.0 tag (c7eeb9f)
- Applied 0001-redbear-local-forks.patch (Cargo.toml crate path redirects)
- Applied fix-uefi-alloc-panic.patch equivalents (4 panic!() -> graceful
error handling in src/main.rs)
- Applied P5-live-preload-cap-1gib.patch (1 GiB cap on live image preload)
- Skipped: P0 GPT partition scan (requires new module + integration),
P1 timeout/default-resolution, P2 live preload guard (subsumed by
panic fixes + cap), P3 live image safe read, P4 large ISO boot,
redox.patch — to be applied in dedicated rebase session.
firmware-loader/Cargo.toml: version 0.1.0 -> 0.3.0 (sync with other
Red Bear custom crates which are at 0.3.0).
fork-upstream-map.toml: bootloader back from PENDING_REBASE to 1.0.0
since the partial rebase matches upstream 1.0.0 content.
fork-upstream-map.toml: base restored to 'main' tracked (was correctly
tracked by build-redbear.sh).
104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
/* Open a stream to a sub-process.
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Copyright (C) 2009-2025 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Eric Blake <ebb9@byu.net>, 2009. */
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#include <config.h>
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/* Specification. */
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#include <stdio.h>
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#if defined _WIN32 && ! defined __CYGWIN__
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/* Native Windows API. */
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# include <string.h>
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FILE *
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popen (const char *filename, const char *mode)
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{
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/* Use binary mode by default. */
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if (strcmp (mode, "r") == 0)
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mode = "rb";
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else if (strcmp (mode, "w") == 0)
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mode = "wb";
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return _popen (filename, mode);
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}
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#else
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# include <errno.h>
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# include <fcntl.h>
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# include <stdlib.h>
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# include <unistd.h>
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# undef popen
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FILE *
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rpl_popen (const char *filename, const char *mode)
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{
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/* All other platforms have popen and fcntl.
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The bug of the child clobbering its own file descriptors if stdin
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or stdout was closed in the parent can be worked around by
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opening those two fds as close-on-exec to begin with. */
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/* Cygwin 1.5.x also has a bug where the popen fd is improperly
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marked close-on-exec, and if the application undoes this, then
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the fd leaks into subsequent popen calls. We could work around
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this by maintaining a list of all fd's opened by popen, and
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temporarily marking them cloexec around the real popen call, but
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we would also have to override pclose, and the bookkeeping seems
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extreme given that cygwin 1.7 no longer has the bug. */
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FILE *result;
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int cloexec0 = fcntl (STDIN_FILENO, F_GETFD);
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int cloexec1 = fcntl (STDOUT_FILENO, F_GETFD);
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int saved_errno;
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/* If either stdin or stdout was closed (that is, fcntl failed),
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then we open a dummy close-on-exec fd to occupy that slot. That
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way, popen's internal use of pipe() will not contain either fd 0
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or 1, overcoming the fact that the child process blindly calls
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close() on the parent's end of the pipe without first checking
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whether it is clobbering the fd just placed there via dup2(); the
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exec will get rid of the dummy fd's in the child. Fortunately,
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closed stderr in the parent does not cause problems in the
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child. */
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if (cloexec0 < 0)
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{
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if (open ("/dev/null", O_RDONLY) != STDIN_FILENO
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|| fcntl (STDIN_FILENO, F_SETFD,
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fcntl (STDIN_FILENO, F_GETFD) | FD_CLOEXEC) == -1)
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abort ();
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}
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if (cloexec1 < 0)
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{
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if (open ("/dev/null", O_RDONLY) != STDOUT_FILENO
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|| fcntl (STDOUT_FILENO, F_SETFD,
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fcntl (STDOUT_FILENO, F_GETFD) | FD_CLOEXEC) == -1)
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abort ();
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}
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result = popen (filename, mode);
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/* Now, close any dummy fd's created in the parent. */
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saved_errno = errno;
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if (cloexec0 < 0)
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close (STDIN_FILENO);
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if (cloexec1 < 0)
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close (STDOUT_FILENO);
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errno = saved_errno;
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return result;
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}
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#endif
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