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#include <elf_info.h>
/* The 32bit and 64bit note headers make it clear we don't care */
typedef Elf32_Nhdr Elf_Nhdr;
extern const char *fname;
/* stole this macro from kernel printk.c */
#define LOG_BUF_LEN_MAX (uint32_t)(1 << 31)
static void write_to_stdout(char *buf, unsigned int nr)
{
ssize_t ret;
static uint32_t n_bytes = 0;
n_bytes += nr;
if (n_bytes > LOG_BUF_LEN_MAX) {
fprintf(stderr, "The vmcore-dmesg.txt over 2G in size is not supported.\n");
exit(53);
}
ret = write(STDOUT_FILENO, buf, nr);
if (ret != nr) {
fprintf(stderr, "Failed to write out the dmesg log buffer!:"
" %s\n", strerror(errno));
exit(54);
}
}
static int read_vmcore_dmesg(int fd, void (*handler)(char*, unsigned int))
{
int ret;
ret = read_elf(fd);
if (ret > 0) {
fprintf(stderr, "Unable to read ELF information"
" from vmcore\n");
return ret;
}
dump_dmesg(fd, handler);
return 0;
}
int main(int argc, char **argv)
{
ssize_t ret;
int fd;
if (argc != 2) {
fprintf(stderr, "usage: %s <kernel core file>\n", argv[0]);
return 1;
}
fname = argv[1];
fd = open(fname, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Cannot open %s: %s\n",
fname, strerror(errno));
return 2;
}
ret = read_vmcore_dmesg(fd, write_to_stdout);
close(fd);
return ret;
}
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