dfdba5b4a7
Previously, running reboot-mode as an unprivileged user resulted in
Error: No error information
without a newline at the end. According to SYSCALL(2), the return value
of -1 indicated an error, but the actual error code is stored in errno.
51 lines
1 KiB
C
51 lines
1 KiB
C
// SPDX-License-Identifier: GPL-3.0-or-later
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/*
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* Reboot the device to a specific mode
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*
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* Copyright (C) 2019 Daniele Debernardi <drebrez@gmail.com>
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*/
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#include <errno.h>
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#include <linux/reboot.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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void usage(char *appname)
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{
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printf("Usage: %s [-h] MODE\n\n", appname);
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printf("Reboot the device to the MODE specified (e.g. recovery, bootloader)\n\n");
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printf("WARNING: the reboot is instantaneous\n\n");
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printf("optional arguments:\n");
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printf(" -h Show this help message and exit\n");
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}
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int main(int argc, char **argv)
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{
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if (argc != 2) {
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usage(argv[0]);
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exit(1);
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}
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int opt;
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while ((opt = getopt(argc, argv, "h")) != -1) {
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switch (opt) {
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case 'h':
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default:
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usage(argv[0]);
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exit(1);
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}
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}
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sync();
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int ret;
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ret = syscall(__NR_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, argv[1]);
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if (ret < 0) {
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printf("Error: %s\n", strerror(errno));
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}
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return ret;
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}
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