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100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/* Misc. utility functions and C-library extensions for finit and its plugins
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*
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* Copyright (c) 2008-2010 Claudio Matsuoka <cmatsuoka@gmail.com>
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* Copyright (c) 2008-2015 Joachim Nilsson <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "helpers.h"
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#include "libite/lite.h"
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/**
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* pid_alive - Check if a given process ID is running
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* @pid: Process ID to check for.
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*
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* Returns:
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* %TRUE(1) if pid is alive (/proc/pid exists), otherwise %FALSE(0)
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*/
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int pid_alive(pid_t pid)
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{
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char name[24]; /* Enough for max pid_t */
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snprintf(name, sizeof(name), "/proc/%d", pid);
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return fexist(name);
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}
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/**
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* pid_get_name - Find name of a process
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* @pid: PID of process to find.
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* @name: Pointer to buffer where to return process name, may be %NULL
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* @len: Length in bytes of @name buffer.
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*
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* If @name is %NULL, or @len is zero the function will return
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* a static string. This may be useful to one-off calls.
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*
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* Returns:
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* %NULL on error, otherwise a va
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*/
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char *pid_get_name(pid_t pid, char *name, size_t len)
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{
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int ret = 1;
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FILE *fp;
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char *pname, path[32];
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static char line[64];
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snprintf(path, sizeof(path), "/proc/%d/status", pid);
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fp = fopen(path, "r");
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if (fp) {
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if (fgets(line, sizeof (line), fp)) {
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pname = line + 6; /* Skip first part of line --> "Name:\t" */
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chomp(pname);
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if (name)
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strlcpy(name, pname, len);
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ret = 0; /* Found it! */
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}
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fclose(fp);
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}
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if (ret)
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return NULL;
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if (name)
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return name;
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return pname;
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}
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/**
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* Local Variables:
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* version-control: t
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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