qianjigui/CBestPractice_forkrun.c

## CBestPractice_forkrun.c
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <sys/stat.h>


pid_t child;
int childStatus;

if((child = fork()) < 0){
    LOGE("fork children error : %s", strerror(errno));
} else if(0==child) {
    //child
    execlp(cmdfile,argument0,argument1,NULL);//Last Argument : NULL
    //Only return if execlp run failed
    LOGE("child execlp error : %s", strerror(errno));
    exit(EXIT_FAILURE);
} else {
    //parent
    waitpid(child, &childStatus, 0);
    if (WIFEXITED(childStatus)){
        if (0==WEXITSTATUS(childStatus)) {
            LOGI("Execute success");
            //success
        } else {
            LOGI("Execute failed ");
            //failed
        }
    } else {
        LOGI("Execute failed unexpected ");
        //failed unexpected
    }
}

## CBestPractice_forkruntimeout.c
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <sys/stat.h>

static bool forkRunShell(const char* fullname)
{
    pid_t child;
    int childStatus;
    bool res = false;

    if((child = fork()) < 0){
        LOGE("fork children error : %s", strerror(errno));
    } else if(0==child) {
        //child
        execlp(SHELL_PATH,SHELL_PATH,fullname,NULL);//Last Argument : NULL
        //Only return if execlp run failed
        LOGE("child execlp error : %s", strerror(errno));
        exit(EXIT_FAILURE);
    } else {
        int time = 0;
        int rc;
        bool isWait=false;
        //parent
        while(time<EACH_SHELL_TIMEOUT_SECONDS){
            isWait=false;
            rc=waitpid(child, &childStatus, WNOHANG);
            if(rc<0){
                LOGE("waitpid failed: %s", strerror(errno));
            } else if(rc>0){
                if (WIFEXITED(childStatus)){
                    if (0==WEXITSTATUS(childStatus)) {
                        LOGI("Execute success");
                        res = true;
                        //success
                    } else {
                        LOGI("Execute failed ");
                        //failed
                    }
                } else {
                    LOGI("Execute failed unexpected %d",WTERMSIG(childStatus));
                    //failed unexpected
                }
            } else {
                time++;
                LOGD("Parent sleep %ds to child(%d)",time,child);
                sleep(1);
                isWait=true;
            }
            if(!isWait)break;
        }
        if(isWait){
            LOGW("Child Process timeout");
            kill(child, SIGTERM);
        }
    }
    return res;
}
	#include <errno.h>
	#include <unistd.h>
	#include <stdlib.h>
	#include <sys/wait.h>
	#include <sys/stat.h>


	pid_t child;
	int childStatus;

	if((child = fork()) < 0){
	LOGE("fork children error : %s", strerror(errno));
	} else if(0==child) {
	//child
	execlp(cmdfile,argument0,argument1,NULL);//Last Argument : NULL
	//Only return if execlp run failed
	LOGE("child execlp error : %s", strerror(errno));
	exit(EXIT_FAILURE);
	} else {
	//parent
	waitpid(child, &childStatus, 0);
	if (WIFEXITED(childStatus)){
	if (0==WEXITSTATUS(childStatus)) {
	LOGI("Execute success");
	//success
	} else {
	LOGI("Execute failed ");
	//failed
	}
	} else {
	LOGI("Execute failed unexpected ");
	//failed unexpected
	}
	}