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/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdbool.h>
#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include <sys/wait.h>
#include <signal.h>
#include <ctype.h>
#include "process-util.h"
#include "fileio.h"
#include "util.h"
#include "log.h"
int get_process_comm(pid_t pid, char **name) {
const char *p;
int r;
assert(name);
assert(pid >= 0);
p = procfs_file_alloca(pid, "comm");
r = read_one_line_file(p, name);
if (r == -ENOENT)
return -ESRCH;
return r;
}
int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
_cleanup_fclose_ FILE *f = NULL;
char *r = NULL, *k;
const char *p;
int c;
assert(line);
assert(pid >= 0);
p = procfs_file_alloca(pid, "cmdline");
f = fopen(p, "re");
if (!f)
return -errno;
if (max_length == 0) {
size_t len = 0, allocated = 0;
while ((c = getc(f)) != EOF) {
if (!GREEDY_REALLOC(r, allocated, len+2)) {
free(r);
return -ENOMEM;
}
r[len++] = isprint(c) ? c : ' ';
}
if (len > 0)
r[len-1] = 0;
} else {
bool space = false;
size_t left;
r = new(char, max_length);
if (!r)
return -ENOMEM;
k = r;
left = max_length;
while ((c = getc(f)) != EOF) {
if (isprint(c)) {
if (space) {
if (left <= 4)
break;
*(k++) = ' ';
left--;
space = false;
}
if (left <= 4)
break;
*(k++) = (char) c;
left--;
} else
space = true;
}
if (left <= 4) {
size_t n = MIN(left-1, 3U);
memcpy(k, "...", n);
k[n] = 0;
} else
*k = 0;
}
/* Kernel threads have no argv[] */
if (isempty(r)) {
_cleanup_free_ char *t = NULL;
int h;
free(r);
if (!comm_fallback)
return -ENOENT;
h = get_process_comm(pid, &t);
if (h < 0)
return h;
r = strjoin("[", t, "]", NULL);
if (!r)
return -ENOMEM;
}
*line = r;
return 0;
}
int get_process_environ(pid_t pid, char **env) {
_cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ char *outcome = NULL;
int c;
const char *p;
size_t allocated = 0, sz = 0;
assert(pid >= 0);
assert(env);
p = procfs_file_alloca(pid, "environ");
f = fopen(p, "re");
if (!f)
return -errno;
while ((c = fgetc(f)) != EOF) {
if (!GREEDY_REALLOC(outcome, allocated, sz + 5))
return -ENOMEM;
if (c == '\0')
outcome[sz++] = '\n';
else
sz += cescape_char(c, outcome + sz);
}
outcome[sz] = '\0';
*env = outcome;
outcome = NULL;
return 0;
}
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