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).
67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/* stdopen.c - ensure that the three standard file descriptors are in use
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Copyright (C) 2005-2006, 2019-2025 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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 General Public License for more details.
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You should have received a copy of the GNU 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 Paul Eggert and Jim Meyering. */
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#include <config.h>
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#include "stdopen.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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/* Try to ensure that all of the standard file numbers (0, 1, 2)
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are in use. Without this, each application would have to guard
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every call to open, dup, fopen, etc. with tests to ensure they
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don't use one of the special file numbers when opening a file.
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Return zero if successful, an errno value if at least one of
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the file descriptors is initially closed and could not be opened. */
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int
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stdopen (void)
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{
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int fd;
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for (fd = STDIN_FILENO; fd <= STDERR_FILENO; fd++)
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{
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if (fcntl (fd, F_GETFD) < 0)
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{
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/* Open /dev/null with the contrary mode so that the typical
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read (stdin) or write (stdout, stderr) operation will fail.
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With descriptor 0, we can do even better on systems that
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have /dev/full, by opening that write-only instead of
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/dev/null. The only drawback is that a write-provoked
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failure comes with a misleading errno value, ENOSPC. */
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int mode = fd == STDIN_FILENO ? O_WRONLY : O_RDONLY;
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int full_fd = fd == STDIN_FILENO ? open ("/dev/full", mode) : -1;
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int new_fd = full_fd < 0 ? open ("/dev/null", mode) : full_fd;
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if (new_fd < 0)
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return errno;
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if (STDERR_FILENO < new_fd)
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{
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/* 0, 1, and 2 are already open somehow.
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Our is not to reason why. */
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close (new_fd);
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return 0;
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}
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}
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}
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return 0;
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}
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