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Octocat-spinner-32-eaf2f5

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file 98 lines (80 sloc) 1.793 kb
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#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <malloc.h>
#include <errno.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

extern int init_module(void *, unsigned long, const char *);

static void *read_file(const char *filename, ssize_t *_size)
{
int ret, fd;
struct stat sb;
ssize_t size;
void *buffer = NULL;

/* open the file */
fd = open(filename, O_RDONLY);
if (fd < 0)
return NULL;

/* find out how big it is */
if (fstat(fd, &sb) < 0)
goto bail;
size = sb.st_size;

/* allocate memory for it to be read into */
buffer = malloc(size);
if (!buffer)
goto bail;

/* slurp it into our buffer */
ret = read(fd, buffer, size);
if (ret != size)
goto bail;

/* let the caller know how big it is */
*_size = size;

bail:
close(fd);
return buffer;
}

int insmod_main(int argc, char **argv)
{
void *file;
ssize_t size = 0;
char opts[1024];
int ret;

/* make sure we've got an argument */
if (argc < 2) {
fprintf(stderr, "usage: insmod <module.o>\n");
return -1;
}

/* read the file into memory */
file = read_file(argv[1], &size);
if (!file) {
fprintf(stderr, "insmod: can't open '%s'\n", argv[1]);
return -1;
}

opts[0] = '\0';
if (argc > 2) {
int i, len;
char *end = opts + sizeof(opts) - 1;
char *ptr = opts;

for (i = 2; (i < argc) && (ptr < end); i++) {
len = MIN(strlen(argv[i]), end - ptr);
memcpy(ptr, argv[i], len);
ptr += len;
*ptr++ = ' ';
}
*(ptr - 1) = '\0';
}

/* pass it to the kernel */
ret = init_module(file, size, opts);
if (ret != 0) {
fprintf(stderr,
                "insmod: init_module '%s' failed (%s)\n",
                argv[1], strerror(errno));
}

/* free the file buffer */
free(file);

return ret;
}

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