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105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
/**
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* Copyright (c) 2013, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file auto_pid.hh
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*/
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#ifndef __auto_pid_hh
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#define __auto_pid_hh
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#include <errno.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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class auto_pid {
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public:
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auto_pid(pid_t child = -1) : ap_child(child), ap_status(0) {};
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auto_pid(auto_pid &other) : ap_child(other.release()), ap_status(0) { };
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~auto_pid() { this->reset(); };
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auto_pid &operator =(auto_pid &other) {
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this->reset(other.release());
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this->ap_status = other.ap_status;
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return *this;
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};
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bool in_child() const {
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return this->ap_child == 0;
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};
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pid_t release() {
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pid_t retval = this->ap_child;
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this->ap_child = -1;
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return retval;
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};
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int status() const {
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return this->ap_status;
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};
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bool wait_for_child(int options = 0) {
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if (this->ap_child != -1) {
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int rc;
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while ((rc = waitpid(this->ap_child,
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&this->ap_status,
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options)) < 0 && (errno == EINTR)) {
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;
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}
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if (rc > 0) {
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this->ap_child = -1;
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}
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}
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return this->ap_child == -1;
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};
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void reset(pid_t child = -1) {
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if (this->ap_child != child) {
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this->ap_status = 0;
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if (this->ap_child != -1) {
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kill(this->ap_child, SIGTERM);
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this->wait_for_child();
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}
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this->ap_child = child;
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}
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};
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private:
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auto_pid(const auto_pid &other) { };
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pid_t ap_child;
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int ap_status;
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};
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#endif
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