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| | #include "compat-util.h"
static int usage(const char * argv0)
{
fprintf(stderr, "Usage: %s [-o OFFSET] [-l LENGTH] FILE...\n", argv0);
return 1;
}
static void mincore_stats(const char *path, off_t offset, off_t len)
{
char *map;
unsigned char *vec;
size_t vec_len;
size_t map_len;
off_t map_offset;
int fd;
size_t i;
static const char *fmt = sizeof(void *) == 8 ?
"%s: %016lx %x\n": "%s: %08lx %x\n";
if ((fd = open(path, O_RDONLY|O_NOATIME)) < 0) {
fprintf(stderr, "%s: open(): %s\n", path, strerror(errno));
return;
}
if (!len) {
struct stat sb;
if (fstat(fd, &sb) < 0) {
fprintf(stderr, "%s: fstat(%d): %s\n",
path, fd, strerror(errno));
goto err_close;
}
len = sb.st_size - offset;
}
vec_len = (len + page_size() - 1) / page_size();
if (!(vec = malloc(vec_len))) {
fprintf(stderr, "%s: malloc(%lu): %s\n",
path, (unsigned long)vec_len, strerror(errno));
goto err_close;
}
map_len = PAGE_ALIGN(len);
map_offset = PAGE_ALIGN_DOWN(offset + 1);
map = mmap(NULL, map_len, PROT_READ, MAP_SHARED, fd, map_offset);
if (!map) {
fprintf(stderr, "%s: mmap(%lu): %s\n",
path, (unsigned long)vec_len, strerror(errno));
goto err_free;
}
if (mincore(map, map_len, vec) < 0) {
fprintf(stderr, "%s: mincore(%lu): %s\n",
path, (unsigned long)vec_len, strerror(errno));
goto err_munmap;
}
for (i = 0; i < vec_len; ++i)
printf(fmt, path,
(unsigned long)((page_size() * i) + map_offset),
vec[i] & 1);
err_munmap:
munmap(map, map_len);
err_free:
free(vec);
err_close:
close(fd);
}
int main(int argc, char * const argv[])
{
off_t offset = 0;
off_t len = 0;
int argi = 1;
int opt;
while ((opt = getopt(argc, argv, "o:l:h")) != -1) {
char *err;
argi += 2;
switch(opt) {
case 'o':
offset = cstr_to_off_t(optarg, &err, 10);
if (*err || offset < 0) {
fprintf(stderr, "offset must be >= 0\n");
return 1;
}
break;
case 'l':
len = cstr_to_off_t(optarg, &err, 10);
if (*err || len < 0) {
fprintf(stderr, "length must be >= 0\n");
return 1;
}
break;
default:
return usage(argv[0]);
}
}
if (argi >= argc)
return usage(argv[0]);
for (; argi < argc; ++argi)
mincore_stats(argv[argi], offset, len);
return 0;
}
|