diff options
author | José Bollo <jose.bollo@iot.bzh> | 2018-02-14 15:12:30 +0100 |
---|---|---|
committer | José Bollo <jose.bollo@iot.bzh> | 2018-02-14 15:12:30 +0100 |
commit | abbb4599f0b921c6f434b6bd02bcfb277eecf745 (patch) | |
tree | fd8a7449742fbb4c445286529349ab12cca9540a /src/afs-discover.c | |
parent | 4788fcd7becaef5a665dea0f9c0345401c80f757 (diff) |
afs-supervisor: Add discovery mechanic
Change-Id: Icfcdcc16d0433454c9bb0785d0690f7f173980ae
Signed-off-by: José Bollo <jose.bollo@iot.bzh>
Diffstat (limited to 'src/afs-discover.c')
-rw-r--r-- | src/afs-discover.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/afs-discover.c b/src/afs-discover.c new file mode 100644 index 00000000..cad95574 --- /dev/null +++ b/src/afs-discover.c @@ -0,0 +1,66 @@ +/* + * Copyright (C) 2016, 2017 "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); +} + |