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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172/* SPDX-License-Identifier: GPL-2.0 *//* * Copyright (c) 2024 Meta Platforms, Inc. and affiliates. * Copyright (c) 2024 David Vernet <dvernet@meta.com> */#include <errno.h>#include <fcntl.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>
/* Returns read len on success, or -errno on failure. */static ssize_t read_text(const char *path, char *buf, size_t max_len){ ssize_t len; int fd;
fd = open(path, O_RDONLY); if (fd < 0) return -errno;
len = read(fd, buf, max_len - 1);
if (len >= 0) buf[len] = 0;
close(fd); return len < 0 ? -errno : len;}
/* Returns written len on success, or -errno on failure. */static ssize_t write_text(const char *path, char *buf, ssize_t len){ int fd; ssize_t written;
fd = open(path, O_WRONLY | O_APPEND); if (fd < 0) return -errno;
written = write(fd, buf, len); close(fd); return written < 0 ? -errno : written;}
long file_read_long(const char *path){ char buf[128];
if (read_text(path, buf, sizeof(buf)) <= 0) return -1;
return atol(buf);}
int file_write_long(const char *path, long val){ char buf[64]; int ret;
ret = sprintf(buf, "%ld", val); if (ret < 0) return ret;
if (write_text(path, buf, ret) <= 0) return -1;
return 0;}