linux – 检查从同一bash脚本启动的后台进程的运行状态

概述我必须编写一个bash脚本,根据传递的命令行参数在后台启动进程,如果成功运行启动程序则返回. 这是我想要实现的伪代码 if [ "$1" = "PROG_1" ] ; then ./launchProg1 & if [ isLaunchSuccess ] ; then echo "Success" else echo "failed" 我必须编写一个bash脚本,根据传递的命令行参数在后台启动进程,如果成功运行启动程序则返回.

这是我想要实现的伪代码

if [ "" = "PROG_1" ] ; then    ./launchProg1 &    if [ isLaunchSuccess ] ; then        echo "Success"    else        echo "Failed"        exit 1    fielif [ "" = "PROG_2" ] ; then    ./launchProg2 &    if [ isLaunchSuccess ] ; then        echo "Success"    else        echo "Failed"        exit 1    fifi

脚本不能等待或睡眠,因为它将由另一个关键任务c程序调用,并且需要高吞吐量(每秒没有启动进程),而且进程的运行时间未知.脚本既不需要捕获任何输入/输出,也不需要等待已启动的进程完成.

我没有成功尝试以下方法：

#Method 1if [ "" = "KP1" ] ; then    echo "The Arguement is KP1"    ./kp 'this is text' &    if [ $? = "0" ] ; then        echo "Success"    else        echo "Failed"        exit 1    fielif [ "" = "KP2" ] ; then    echo "The Arguement is KP2"    ./NoSuchCommand 'this is text' &    if [ $? = "0" ] ; then        echo "Success"    else        echo "Failed"        exit 1    fi#Method 2elif [ "" = "CD5" ] ; then    echo "The Arguement is CD5"    cd "doesNotExist" &    PROC_ID=$!    echo "PID is $PROC_ID"    if kill -0 "$PROC_ID" ; then        echo "Success"    else        echo "Failed"        exit 1    fi#Method 3elif [ "" = "CD6" ] ; then    echo "The Arguement is CD6"    cd .. &    PROC_ID=$!    echo "PID is $PROC_ID"    ps -eo pID | grep "$PROC_ID" && { echo "Success"; exit 0; }    ps -eo pID | grep  "$PROC_ID" || { echo "Failed" ; exit 1; }else    echo "UnkNown Argument"    exit 1fi

运行脚本会产生不可靠的输出.方法1,2总是返回成功,而方法3在检查之前完成流程执行时返回失败.

这是在GNU bash上测试的示例,版本4.1.2(1)-release(x86_64-redhat-linux-gnu)和GNU bash,版本4.3.11(1)-release(x86_64-pc-linux-gnu)

[scripts]$./processstarted3.sh KP1The Arguement is KP1Success[scripts]$./processstarted3.sh KP2The Arguement is KP2Success./processstarted3.sh: line 13: ./NoSuchCommand: No such file or directory[scripts]$./processstarted3.sh CD6The Arguement is CD6PID is 25050Failed

正如类似问题所示,我不能使用进程名称,因为one process may be executed several times和others无法应用.

我没有尝试过screen和tmux,因为获得在生产服务器上安装它们的权限并不容易(但如果这是剩下的唯一选择,那么会这样做)

UPDATE
@ghoti
./kp是存在的程序,启动程序返回Success. ./NoSuchCommand不存在.从(编辑过的)输出中可以看出,脚本错误地返回Success.

进程完成执行或程序异常终止时无关紧要.通过脚本启动的程序不会以任何方式进行跟踪(因此我们不会将pID存储在任何表中,也不会出现使用deamontools的必要性).

@Etan Reisner
无法启动的程序示例是./NoSuchCommand,它不存在.或者可能是一个无法启动的损坏的程序.

@Vorsprung
调用在后台启动程序的脚本不需要很多时间(并且可以按照我们的期望进行管理).但是睡眠1会随着时间的推移累积而引起问题.

前面提到的#Method3可以很好地限制在ps -eo pID |之前终止的限制进程grep“$PROC_ID”&& {echo“成功”;退出0;可以执行检查.

解决方法 这是一个示例,它将显示一个过程的结果,无论它是否成功启动.

#!/bin/bash & #executes a program in background which is provIDed as an argumentpID=$! #stores executed process ID in pIDcount=$(ps -A| grep $pID |wc -l) #check whether process is still runningif [[ $count -eq 0 ]] #if process is already terminated,then there can be two cases,the process executed and stop successfully or it is terminated abnormallythen        if wait $pID; then #checks if process executed successfully or not                echo "success"        else                    #process terminated abnormally                echo "Failed (returned $?)"        fielse        echo "success"  #process is still runningfi#Note: The above script will only provIDe a result whether process started successfully or not. If porcess starts successfully and later it terminates abnormally then this sciptwill not provIDe a correct result

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