521251d275
The kernel returns specific error codes which may be lost if we use the libc buffered io functions. Fixes: https://github.com/systemd/systemd/issues/7744
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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 systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "fd-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "macro.h"
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#include "string-util.h"
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#include "sysctl-util.h"
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char *sysctl_normalize(char *s) {
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char *n;
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n = strpbrk(s, "/.");
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/* If the first separator is a slash, the path is
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* assumed to be normalized and slashes remain slashes
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* and dots remains dots. */
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if (!n || *n == '/')
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return s;
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/* Otherwise, dots become slashes and slashes become
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* dots. Fun. */
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while (n) {
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if (*n == '.')
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*n = '/';
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else
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*n = '.';
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n = strpbrk(n + 1, "/.");
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}
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return s;
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}
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int sysctl_write(const char *property, const char *value) {
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char *p;
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_cleanup_close_ int fd = -1;
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assert(property);
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assert(value);
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log_debug("Setting '%s' to '%s'", property, value);
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p = strjoina("/proc/sys/", property);
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fd = open(p, O_WRONLY|O_CLOEXEC);
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if (fd < 0)
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return -errno;
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if (!endswith(value, "\n"))
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value = strjoina(value, "\n");
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if (write(fd, value, strlen(value)) < 0)
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return -errno;
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return 0;
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}
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int sysctl_read(const char *property, char **content) {
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char *p;
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assert(property);
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assert(content);
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p = strjoina("/proc/sys/", property);
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return read_full_file(p, content, NULL);
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}
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