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/*
* Generate initrd.size file for zSeries platforms.
* Takes an integer argument and writes out the binary representation of
* that value to the initrd.size file.
* https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=197773
*/
#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
int main(int argc,char **argv) {
unsigned int zero = 0;
int fd;
unsigned int size;
mode_t mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH;
if (argc != 3) {
printf("Usage: %s [integer size] [output file]\n", basename(argv[0]));
printf("Example: %s 12288475 initrd.size\n", basename(argv[0]));
return 0;
}
size = htonl(atoi(argv[1]));
fd = open(argv[2], O_CREAT | O_RDWR, mode);
if (write(fd, &zero, sizeof(int)) == -1) {
perror("writing initrd.size (zero)");
return errno;
}
if (write(fd, &size, sizeof(int)) == -1) {
perror("writing initrd.size (size)");
return errno;
}
close(fd);
return 0;
}
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