sbsv2/raptor/util/talon/process.c
author Richard Taylor <richard.i.taylor@nokia.com>
Thu, 18 Mar 2010 14:00:53 +0000
branchfix
changeset 379 59ec73480ed3
parent 240 fbc6a8ad3957
permissions -rw-r--r--
catch up
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/*
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* Copyright (c) 2009-2010 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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#include <unistd.h>
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#include "process.h"
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#include "buffer.h"
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#include <stdlib.h>
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#include <string.h>
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#include <poll.h>
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#include <signal.h>
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#include <errno.h>
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#include <sys/wait.h>
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#include "log.h"
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proc *process_new(void)
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{
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	proc *p = malloc(sizeof(proc));
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	p->output = buffer_new();
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	if (!p->output)
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	{
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		free(p);
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		return  NULL;
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	}
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	p->starttime = 0;
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	p->endtime = 0;
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	p->returncode = 1;
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	p->pid = 0;
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	p->causeofdeath = PROC_NORMALDEATH;
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	return p;
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}
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void childsig(int sig)
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{
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	//wait(&stat_loc);
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	DEBUG(("SIGCHLD\n"));
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}
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struct sigaction child_action;
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proc *process_run(char executable[], char *args[], int timeout)
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{
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	proc *p = process_new();
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	if (p == NULL)
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		return NULL;
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	char *text;
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	int status;
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	int stdout_p[2];
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	int stderr_p[2];
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	child_action.sa_handler = childsig;
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	sigemptyset (&child_action.sa_mask);
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	child_action.sa_flags = 0;
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	sigaction (SIGCHLD, &child_action, NULL);
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	pipe(stdout_p);
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	pipe(stderr_p);
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	pid_t child = fork();
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	if (child == 0)
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	{
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		close(stdout_p[0]);
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		dup2(stdout_p[1], 1);
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		close(stdout_p[1]);
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		close(stderr_p[0]);
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		dup2(stderr_p[1], 2);
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		close(stderr_p[1]);
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		execvp(executable, args);
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		exit(1);
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	} else if (child == -1) {
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		p->causeofdeath = PROC_SOMEODDDEATH;
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		return p;
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	}
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	else
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	{
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		close(stdout_p[1]);
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		close(stderr_p[1]);
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		p->pid = child;
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		DEBUG(("child running\n"));
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	}
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	struct pollfd pf[2];
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	int pv;
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	int have_status = 0;
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	do
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	{
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		pf[0].fd = stdout_p[0];
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		pf[1].fd = stderr_p[0];
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		pf[0].events = POLLIN;
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		pf[0].revents = 0;
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		pf[1].events = POLLIN;
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		pf[1].revents = 0;
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		DEBUG(("polling\n"));
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	       	pv = poll(pf, 2, timeout);
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		DEBUG(("polled %d\n", pv));
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		if (pv == -1)
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		{
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		       	if (errno == EAGAIN)
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			{
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				errno = 0;
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				DEBUG(("errno: \n"));
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				continue;
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			} else {
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				/* EINVAL - can't poll */
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				process_free(&p);
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				return NULL;
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			}
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		} else if (pv == 0 ) {
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			/* timeout */
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			DEBUG(("timeout: \n"));
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			kill(p->pid, SIGTERM);
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			p->causeofdeath = PROC_TIMEOUTDEATH;
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			break;
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		}
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		if (pf[0].revents & POLLIN )
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		{
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			char *space = buffer_makespace(p->output, 1024);
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			int nbytes = read(pf[0].fd, space, 1024);
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			if (nbytes < 0)
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				break;
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			buffer_usespace(p->output, nbytes);
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		}
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		if (pf[1].revents & POLLIN )
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		{
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			char *space = buffer_makespace(p->output, 1024);
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			int nbytes = read(pf[1].fd, space, 1024);
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			if (nbytes < 0)
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				break;
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			buffer_usespace(p->output, nbytes);
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		}
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		if  (pf[0].revents & (POLLERR | POLLHUP | POLLNVAL))
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		{
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			DEBUG(("stdout: pollerr %d\n", pf[0].revents));
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			break;
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		}
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   162
		
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		if (  pf[1].revents & (POLLERR | POLLHUP | POLLNVAL)) 
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		{
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			DEBUG(("stderr: pollerr %d\n", pf[1].revents));
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			break;
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		}
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		DEBUG(("events: %d %d \n", pf[0].revents, pf[1].revents));
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	}
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	while (1);
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	waitpid(p->pid, &status, 0);
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	if (WIFEXITED(status))
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	{
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		p->causeofdeath = PROC_NORMALDEATH;
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		p->returncode = WEXITSTATUS(status);
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		DEBUG(("process exited normally \n"));
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	} else {
237
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		if (p->causeofdeath == PROC_TIMEOUTDEATH)
3
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			p->returncode = 128;
237
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		else {	
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			p->causeofdeath = PROC_SOMEODDDEATH;
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			if (WIFSIGNALED(status))
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				p->returncode = WTERMSIG(status);
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			else
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				p->returncode = 128;
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		}
3
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		DEBUG(("process terminated \n"));
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	}
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	return p;
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}
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   193
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void process_free(proc **pp)
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{
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	if (!pp)
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		return;
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	if (! *pp)
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		return;
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   200
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	if ((*pp)->output)
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   202
		buffer_free(&((*pp)->output));
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   203
	
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	free(*pp);
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   205
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   206
	*pp = NULL;
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   207
}