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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/*
* libsystem
*
* Copyright (c) 2016 Samsung Electronics Co., Ltd.
*
* 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.
*/
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "libsystem.h"
/* In old kernel, this symbol maybe NOT */
#ifndef TASK_COMM_LEN
#define TASK_COMM_LEN 16
#endif
ssize_t cmdline_get_str(char **buf, const char *op) {
_cleanup_free_ char *cmdline = NULL;
char *s, *w, *state;
size_t l, ll;
int r;
assert(buf);
assert(op);
r = read_one_line_from_path("/proc/cmdline", &cmdline);
if (r < 0)
return r;
ll = strlen(op);
FOREACH_WORD(w, l, cmdline, state)
if (strneq(op, w, ll)) {
s = new0(char, l - ll + 1);
if (!s)
return -ENOMEM;
strncpy(s, w + ll, l - ll + 1);
*buf = s;
return l - ll + 1;
}
return -ENOENT;
}
int pid_of(const char *pname) {
_cleanup_closedir_ DIR *dir = NULL;
struct dirent *de;
int r;
dir = opendir("/proc");
if (!dir)
return -errno;
FOREACH_DIRENT(de, dir, return -errno) {
_cleanup_free_ char *path = NULL;
_cleanup_free_ char *comm = NULL;
if (de->d_type != DT_DIR)
continue;
if (!is_number(de->d_name, strlen(de->d_name)))
continue;
r = asprintf(&path, "/proc/%s/comm", de->d_name);
if (r < 0)
return -ENOMEM;
r = read_one_line_from_path(path, &comm);
if (r < 0)
continue;
if (strneq(pname, comm, TASK_COMM_LEN-1))
return atoi(de->d_name);
}
return 0;
}
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