On Sunday 25 March 2012 18:47:14 Sven Oliver Moll wrote:
> Hello!
>
> Again another offer for an lsof applet. To make it as small as possible, now
> all memory is allocated on the stack. If the complete path to an opened file
> is larger that PATH_MAX, it will get truncated. On my x86_64 box, size(1) of
> lsof.o reports 573 bytes.
>
> Greetings,
> SvOlli
>
Hi,
improved version with malloced/freed memory and better use
of libbb functions for further size reduction.
scripts/bloat-o-meter busybox_old busybox_unstripped
function old new delta
lsof_main 385 290 -95
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-95) Total: -95 bytes
Ciao,
Tito
int lsof_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int lsof_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
char *fdpath;
char *exelink;
char *fdlink;
char *tmp;
char *rest = NULL;
pid_t readpid = 0;
struct dirent *entry_pid = (struct dirent *)0;
struct dirent *entry_fd = (struct dirent *)0;
DIR *d_pid = (DIR*)0;
DIR *d_fd = (DIR*)0;
d_pid = xopendir("/proc");
for(;;) {
entry_pid = readdir(d_pid);
if(!entry_pid) {
closedir(d_pid);
return EXIT_SUCCESS;
}
errno = 0;
readpid = bb_strtoul(entry_pid->d_name, &rest, 10);
if( (getpid() != readpid) && (!errno) && (!*rest)) {
tmp = xasprintf("/proc/%s/exe", entry_pid->d_name);
exelink = xmalloc_readlink(tmp);
free(tmp);
fdpath = xasprintf("/proc/%s/fd/", entry_pid->d_name);
d_fd = opendir(fdpath);
if(d_fd) {
for(;;) {
entry_fd = readdir(d_fd);
if(!entry_fd) {
break;
}
if(entry_fd->d_type == DT_LNK) {
tmp = xasprintf("%s/%s",
fdpath, entry_fd->d_name);
fdlink = xmalloc_readlink(tmp);
free(tmp);
printf("%d\t%s\t%s\n", readpid,
exelink, fdlink);
free(fdlink);
}
}
}
closedir(d_fd);
free(fdpath);
free(exelink);
}
}
}
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