63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
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/*
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* geninitrdsz.c
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* Generate initrd.size file for zSeries platforms.
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* Takes an integer argument and writes out the binary representation of
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* that value to the initrd.size file.
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* https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=197773
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*
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* Copyright (C) 2007 Red Hat, Inc. All rights reserved.
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*
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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 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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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 <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <netinet/in.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.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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#include <string.h>
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int main(int argc,char **argv) {
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unsigned int zero = 0;
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int fd;
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unsigned int size;
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mode_t mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH;
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if (argc != 3) {
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printf("Usage: %s [integer size] [output file]\n", basename(argv[0]));
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printf("Example: %s 12288475 initrd.size\n", basename(argv[0]));
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return 0;
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}
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size = htonl(atoi(argv[1]));
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fd = open(argv[2], O_CREAT | O_RDWR, mode);
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if (write(fd, &zero, sizeof(int)) == -1) {
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perror("writing initrd.size (zero)");
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return errno;
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}
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if (write(fd, &size, sizeof(int)) == -1) {
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perror("writing initrd.size (size)");
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return errno;
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}
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close(fd);
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return 0;
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}
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