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/*
* Copyright (C) 2015-2020 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <ctype.h>
#include <dirent.h>
#include <unistd.h>
#include <sys/types.h>
void afs_discover(const char *pattern, void (*callback)(void *closure, pid_t pid), void *closure)
{
intmax_t n;
DIR *dir;
struct dirent *ent;
char *name;
char exe[PATH_MAX], lnk[PATH_MAX];
dir = opendir("/proc");
while ((ent = readdir(dir))) {
name = ent->d_name;
while (isdigit(*name))
name++;
if (*name)
continue;
n = snprintf(exe, sizeof exe, "/proc/%s/exe", ent->d_name);
if (n < 0 || (size_t)n >= sizeof exe)
continue;
n = readlink(exe, lnk, sizeof lnk);
if (n < 0 || (size_t)n >= sizeof lnk)
continue;
lnk[n] = 0;
name = lnk;
while(*name) {
while(*name == '/')
name++;
if (*name) {
if (!strcmp(name, pattern)) {
callback(closure, (pid_t)atoi(ent->d_name));
break;
}
while(*++name && *name != '/');
}
}
}
closedir(dir);
}
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