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/*
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* Intel(R) Enclosure LED Utilities
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* Copyright (C) 2009-2019 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#if _HAVE_DMALLOC_H
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#include <dmalloc.h>
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#endif
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#include "config.h"
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#include "pidfile.h"
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#include "status.h"
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#include "utils.h"
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#define RUN_DIR "/var/run/"
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#define PID ".pid"
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/**
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*/
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status_t pidfile_create(const char *name)
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{
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char buf[PATH_MAX];
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int fd, count;
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snprintf(buf, sizeof(buf), "%s/%s%s", RUN_DIR, name, PID);
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fd = open(buf, O_WRONLY | O_CREAT, 0640);
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if (fd < 0)
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return STATUS_FILE_OPEN_ERROR;
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if (lockf(fd, F_TLOCK, 0) < 0) {
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close(fd);
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return STATUS_FILE_LOCK_ERROR;
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}
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sprintf(buf, "%d\n", getpid());
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count = write(fd, buf, strlen(buf));
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close(fd);
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return (count < 0) ? STATUS_FILE_WRITE_ERROR : STATUS_SUCCESS;
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}
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/**
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*/
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int pidfile_remove(const char *name)
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{
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char buf[PATH_MAX];
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snprintf(buf, sizeof(buf), "%s/%s%s", RUN_DIR, name, PID);
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return unlink(buf);
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}
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/**
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* @brief Test whether process with given pid is still alive
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*
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* @return STATUS_SUCCESS if proces is alive and other error if not or
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* if there is an error
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*/
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int ping_proc(pid_t pid)
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{
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if (pid <= 0)
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return STATUS_INVALID_PATH;
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if (kill(pid, 1) == 0)
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return STATUS_SUCCESS;
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return STATUS_INVALID_PATH;
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}
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/**
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*/
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status_t pidfile_check(const char *name, pid_t *pid)
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{
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char path[PATH_MAX], *p;
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pid_t tp;
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snprintf(path, sizeof(path), "%s/%s%s", RUN_DIR, name, PID);
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p = buf_read(path);
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if (p == NULL)
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return STATUS_INVALID_PATH;
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tp = atoi(p);
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if (pid)
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*pid = tp;
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free(p);
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return ping_proc(tp);
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}
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