我有一个基于套接字的文件服务器程序，它使用$(document).ready(function(){
addNewLicns();
});
function addNewLicns () {
var i = 1
SecId = i + 3
LicenseNumber = "nptLicenseNumber"
Province = "nptProvince"
LicenseCoun = "nptLicenseCoun"
licenseExpMonth = "nptlicenseExpMonth"
licenseExpDay = "nptlicenseExpDay"
licenseExpYear = "nptlicenseExpYear"
PhysicalExpMonth = "nptPhysicalExpMonth"
PhysicalExpDay = "nptPhysicalExpDay"
PhysicalExpYear = "nptPhysicalExpYear"
CurrentLicense = "nptCurrentLicense"
CommercialLicense = "nptCommercialLicense"
CommercialClass = "nptCommercialClass"
NoneEndorsements = "nptNoneEndorsements"
TankerEndorsements = "nptTankerEndorsements"
XEndorsements = "nptXEndorsements"
DoublesEndorsements = "nptDoublesEndorsements"
HazMatEndorsements = "nptHazMatEndorsements"
OtherEndorsements = "nptOtherEndorsements"
HaZmatExpMonth = "nptHaZmatExpMonth"
ZmatExpDay = "nptZmatExpDay"
ZmatExpDayExpYear = "nptZmatExpDayExpYear";
var htmlCont = '<div class="NewLicnsHolder"> <div class="panel panel-default"> <div class="panel-heading"> <h3 class="panel-title">License Information</h3><!-- /.panel-title --> </div><!-- /.panel-heading --> <div class="panel-body"> <div class="form-group"> <div class="col-md-4"> <label for="';
htmlCont += LicenseNumber+i+'" class="control-label required-npt">License Number</label> <input type="text" class="form-control" id="';
htmlCont += LicenseNumber+i+'" name="'+LicenseNumber+i+'" maxlength="150" data-parsley-group="block5" aria-describedby="licenesnum" placeholder="Ex: 1234567 or A123456" required /> <span id="licenesnum" class="help-block">License format should be 7 numeric or 1 alpha + 6 numeric</span> </div><!-- /.col-md-4 --> </div><!-- /.form-group --> <div class="form-group"> <div class="col-md-4"> <label for="';
htmlCont += Province+i+'" class="control-label required-npt">License State/Province</label> <select name="';
htmlCont += Province+i+'" id="'+Province+i+'" class="form-control" data-parsley-group="block5" required> <option value=""></option> <option value="AL">Alabama</option> <option value="AK">Alaska</option> <option value="AZ">Arizona</option> <option value="AR">Arkansas</option> <option value="CA">California</option> <option value="CO">Colorado</option> <option value="CT">Connecticut</option> <option value="DE">Delaware</option> <option value="DC">District Of Columbia</option> <option value="FL">Florida</option> <option value="GA">Georgia</option> <option value="HI">Hawaii</option> <option value="ID">Idaho</option> <option value="IL">Illinois</option> <option value="IN">Indiana</option> <option value="IA">Iowa</option> <option value="KS">Kansas</option> <option value="KY">Kentucky</option> <option value="LA">Louisiana</option> <option value="ME">Maine</option> <option value="MD">Maryland</option> <option value="MA">Massachusetts</option> <option value="MI">Michigan</option> <option value="MN">Minnesota</option> <option value="MS">Mississippi</option> <option value="MO">Missouri</option> <option value="MT">Montana</option> <option value="NE">Nebraska</option> <option value="NV">Nevada</option> <option value="NH">New Hampshire</option> <option value="NJ">New Jersey</option> <option value="NM">New Mexico</option> <option value="NY">New York</option> <option value="NC">North Carolina</option> <option value="ND">North Dakota</option> <option value="OH">Ohio</option> <option value="OK">Oklahoma</option> <option value="OR">Oregon</option> <option value="PA">Pennsylvania</option> <option value="RI">Rhode Island</option> <option value="SC">South Carolina</option> <option value="SD">South Dakota</option> <option value="TN">Tennessee</option> <option value="TX">Texas</option> <option value="UT">Utah</option> <option value="VT">Vermont</option> <option value="VA">Virginia</option> <option value="WA">Washington</option> <option value="WV">West Virginia</option> <option value="WI">Wisconsin</option> <option value="WY">Wyoming</option> <optgroup label="Provinces"> <option value="AB">Alberta</option> <option value="BC">British Columbia</option> <option value="MB">Manitoba</option> <option value="NB">New Brunswick</option> <option value="NL">Newfoundland and Labrador</option> <option value="NT">Northwest Territories</option> <option value="NS">Nova Scotia</option> <option value="NU">Nunavut</option ><option value="ON">Ontario</option> <option value="PE">Prince Edward Island</option> <option value="QC">Quebec</option> <option value="SK">Saskatchewan</option> <option value="YT">Yukon</option> </optgroup> </select> </div><!-- /.col-md-4 --> </div><!-- /.form-group --> <div class="form-group"> <div class="col-md-4"> <label for="';
htmlCont += LicenseCoun+i+'" class="control-label required-npt">What vehicle class are you driving?</label> <select name="';
htmlCont += LicenseCoun+i+'" id="'+LicenseCoun+i+'" class="form-control" data-parsley-group="block5" required> <option value="United States">United States</option> <option value="Canada">Canada</option> </select> </div><!-- /.col-md-4 --> </div><!-- /.form-group --> <div class="form-group"> <div class="input-group"> <div class="required-npt col-md-12">License Expiration</div><!-- /.required-npt --> <div class="pull-left"> <select name="';
htmlCont += licenseExpMonth+i+'" id="'+licenseExpMonth+i+'" class="form-control" data-parsley-group="block5" required> <option value="">MM</option> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> <option value="7">7</option> <option value="8">8</option> <option value="9">9</option> <option value="10">10</option> <option value="11">11</option> <option value="12">12</option> </select> </div><!-- /.pull-left --> <div class="pull-left"> <select name="';
htmlCont += licenseExpDay+i+'" id="'+licenseExpDay+i+'" class="form-control" data-parsley-group="block5" required> <option value="">DD</option> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> <option value="7">7</option> <option value="8">8</option> <option value="9">9</option> <option value="10">10</option> <option value="11">11</option> <option value="12">12</option> <option value="13">13</option> <option value="14">14</option> <option value="15">15</option> <option value="16">16</option> <option value="17">17</option> <option value="18">18</option> <option value="19">19</option> <option value="20">20</option> <option value="21">21</option> <option value="22">22</option> <option value="23">23</option> <option value="24">24</option> <option value="25">25</option> <option value="26">26</option> <option value="27">27</option> <option value="28">28</option> <option value="29">29</option> <option value="30">30</option> <option value="31">31</option> </select> </div><!-- /.pull-left --> <div class="pull-left"> <input type="text" class="form-control " id="';
htmlCont += licenseExpYear+i+'" name="'+licenseExpYear+i+'" maxlength="4" minlength="4" data-parsley-type="number" data-parsley-group="block5" placeholder="YYYY" required /> </div><!--/.pull-left --> </div><!-- /.input-group --> </div><!-- /.form-group --> <div class="form-group"> <div class="input-group"> <div class="required-npt col-md-12">Physical Expiration</div><!-- /.required-npt --> <div class="pull-left"> <select name="';
htmlCont += PhysicalExpMonth+i+'" id="'+PhysicalExpMonth+i+'" class="form-control" data-parsley-group="block5" required> <option value="">MM</option> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> <option value="7">7</option> <option value="8">8</option> <option value="9">9</option> <option value="10">10</option> <option value="11">11</option> <option value="12">12</option> </select> </div><!-- /.pull-left --> <div class="pull-left"> <select name="';
htmlCont += PhysicalExpDay+i+'" id="'+PhysicalExpDay+i+'" class="form-control" data-parsley-group="block5" required> <option value="">DD</option> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> <option value="7">7</option> <option value="8">8</option> <option value="9">9</option> <option value="10">10</option> <option value="11">11</option> <option value="12">12</option> <option value="13">13</option> <option value="14">14</option> <option value="15">15</option> <option value="16">16</option> <option value="17">17</option> <option value="18">18</option> <option value="19">19</option> <option value="20">20</option> <option value="21">21</option> <option value="22">22</option> <option value="23">23</option> <option value="24">24</option> <option value="25">25</option> <option value="26">26</option> <option value="27">27</option> <option value="28">28</option> <option value="29">29</option> <option value="30">30</option> <option value="31">31</option> </select> </div><!-- /.pull-left --> <div class="pull-left"> <input type="text" class="form-control " id="';
htmlCont += PhysicalExpYear+i+'" name="'+PhysicalExpYear+i+'" maxlength="4" minlength="4" data-parsley-type="number" data-parsley-group="block5" placeholder="YYYY" required /> </div><!--/.pull-left --> </div><!-- /.input-group --> </div><!-- /.form-group --> <div class="form-group"> <div class="col-md-12"> <label for="';
htmlCont += CurrentLicense+i+'" id="vldtion-label13" class="control-label required-npt">Is this your current driver license?</label> <span> <input type="radio" name="';
htmlCont += CurrentLicense+i+'" id="'+CurrentLicense+i+'" data-parsley-class-handler="#vldtion-label13" value="Yes" data-parsley-group="block5" required> Yes <input type="radio" name="';
htmlCont += CurrentLicense+i'" id="'+CurrentLicense+SecId+'" value="No"> No </span> </div><!-- /.col-md-12 --> </div><!-- /.form-group --> <div class="form-group"> <div class="col-md-12"> <label for="';
htmlCont += CommercialLicense+i+'" id="vldtion-label14" class="control-label required-npt">Is this a commercial driver license?</label> <span> <input type="radio" name="';
htmlCont += CommercialLicense+i+'" id="'+CommercialLicense+i+'-nptshow" class="radio-holder" data-parsley-class-handler="#vldtion-label14" value="Yes" data-parsley-group="block5" required> Yes <input type="radio" name="';
htmlCont += CommercialLicense+i+'" id="'+CommercialLicense+i+'-npthidden" class="radio-holder" value="No"> No </span> </div><!-- /.col-md-12 --> <div class="col-md-2';
htmlCont += CommercialLicense+' npthidden"> <label for="'+CommercialClass+i+'" class="control-label">License Class</label> <select required name="';
htmlCont += CommercialClass+i+'" id="'+CommercialClass+i+'" class="form-control" data-parsley-group="block5"> <option value=""></option> <option value="Class A">Class A</option> <option value="Class AZ">Class AZ</option> <option value="Class B">Class B</option> <option value="Class C">Class C</option> <option value="Class D">Class D</option> <option value="Class E">Class E</option> <option value="Class 1">Class 1</option> <option value="Class 2">Class 2</option> <option value="Class 3">Class 3</option> <option value="Class 4">Class 4</option> <option value="Class 5">Class 5</option> </select> </div><!-- /.col-md-2 nptCommercialLicense npthidden --> </div><!-- /.form-group --> <div class="form-group"> <div class="col-md-12"> <label for="';
htmlCont += NoneEndorsements+i+'" class="control-label">Endorsements</label> <span> <input type="checkbox" id="';
htmlCont += NoneEndorsements+i+'" name="'+NoneEndorsements+i+'" value="None">None <input type="checkbox" id="';
htmlCont += TankerEndorsements+i+'" name="'+TankerEndorsements+i+'" value="Tanker">Tanker <input type="checkbox" id="';
htmlCont += XEndorsements+i+'" name="'+XEndorsements+i+'" class="check-holder" value="X Endorsement">X Endorsement <input type="checkbox" id="';
htmlCont += DoublesEndorsements+i+'" name="'+DoublesEndorsements+i+'" value="Doubles / Triples">Doubles / Triples <input type="checkbox" id="';
htmlCont += HazMatEndorsements+i+'" name="'+HazMatEndorsements+i+'" class="ckeck-holder" value="Doubles / Triples">HazMat <input type="checkbox" id="';
htmlCont += OtherEndorsements+'" name="'+OtherEndorsements+'" value="Other">Other </span> </div><!-- /.col-md-12 --> <div class="nptHazMatEndorsements nptXEndorsements npthidden"> <div class="input-group"> <div class="required-npt col-md-12">Hazmat expiration date</div><!-- /.required-npt --> <div class="pull-left"> <select name="';
htmlCont += HaZmatExpMonth+i+'" id="'+HaZmatExpMonth+i+'" class="form-control" data-parsley-group="block5" required> <option value="">MM</option> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> <option value="7">7</option> <option value="8">8</option> <option value="9">9</option> <option value="10">10</option> <option value="11">11</option> <option value="12">12</option> </select> </div><!-- /.pull-left --> <div class="pull-left"> <select name="';
htmlCont += ZmatExpDay+i+'" id="'+ZmatExpDay+i+'" class="form-control" data-parsley-group="block5" required> <option value="">DD</option> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> <option value="7">7</option> <option value="8">8</option> <option value="9">9</option> <option value="10">10</option> <option value="11">11</option> <option value="12">12</option> <option value="13">13</option> <option value="14">14</option> <option value="15">15</option> <option value="16">16</option> <option value="17">17</option> <option value="18">18</option> <option value="19">19</option> <option value="20">20</option> <option value="21">21</option> <option value="22">22</option> <option value="23">23</option> <option value="24">24</option> <option value="25">25</option> <option value="26">26</option> <option value="27">27</option> <option value="28">28</option> <option value="29">29</option> <option value="30">30</option> <option value="31">31</option> </select> </div><!-- /.pull-left --> <div class="pull-left"> <input type="text" class="form-control " id="';
htmlCont += ZmatExpDayExpYear+i+'" name="'+ZmatExpDayExpYear+i+'" maxlength="4" minlength="4" data-parsley-type="number" data-parsley-group="block5" placeholder="YYYY" data-parsley-group="block5" required /> </div><!--/.pull-left --> </div><!-- /.input-group --> </div><!-- /.nptHazMatEndorsements nptXEndorsements npthidden --> </div><!-- /.form-group --> </div><!-- /.panel-body --> </div><!-- /.panel panel-default --> </div><!-- /.NewLicnsHolder -->'
$('#addLicns').on('click', function() {
if(i >= 10) {
alert("You can't add More than 10.");
} else {
$(".licnsContainer").append(htmlCont);
}
i++;
});
}一次为多个客户端提供服务。我执行fork后运行此服务器程序后，我收到了很多ps -ef个服务器的子进程。我该如何解决这个问题？下面是我的服务器代码。
提前谢谢。
<defunct>答案 0 :(得分：2)
当子进程完成其作业并终止时，父进程存在＆amp;没有为它调用wait（），然后它变成了僵尸。
wait()，然后内核将正确清除已终止的进程，而不是让它成为僵尸。init进程将成为其父进程，并将终止＆amp;在终止时正确清理子进程。因此，可能是您使用fork()创建了子进程而没有为其创建父进程wait()，并且父进程未终止。
因此，然后子进程完成它的工作，它变成了僵尸。
您可以尝试在子进程上使用wait()。
在何处添加wait()：
wait() / waitpid() / waitid()，其中wait()是最简单的一个控制最少的。如果可以在等待时阻止父进程，那么wait()就可以了，否则需要waitpid()或waitid()。有关每项功能的详细信息，请参阅man页面。fork()之后添加等待函数，在main()结束之前，可能用一个循环来处理多个子进程，并检查wait的返回值来决定下一步。 图书 man页面相当不错，但是linux编程手册（例如TLPI）可能会提供很大的帮助。
这是我在学习linux编程时编写的一个简单的测试程序，它创建了多个子进程＆amp;等他们。
<强> wait_test.c
// wait() test
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/wait.h>
int wait_test() {
pid_t cpid;
int i, max_child = 5;
// create child process,
for(i=1; i<=max_child; i++) {
switch(cpid=fork()) {
case -1: // failed
printf("error while fork()\n");
exit(errno);
case 0: // success, child process goes here
sleep(i);
printf("child [%d], going to exit\n",(int)getpid());
_exit(EXIT_SUCCESS);
break;
default: // success, parent process goes here
printf("parent [%d], child created [%d]\n", (int)getpid(), (int)cpid);
break;
}
}
// wait child to terminate
int status;
while(1) {
if((cpid = wait(&status)) == -1) {
if(errno == ECHILD) {
printf("no more child\n");
exit(EXIT_SUCCESS);
} else {
printf("error while wait()\n");
exit(-1);
}
}
printf("parent [%d], child [%d] exit with [%d]\n", (int)getpid(), (int)cpid, status);
}
return 0;
}
int main(int argc, char *argv[]) {
wait_test();
return 0;
}
在linux上编译： gcc -Wall wait_test.c
执行： ./a.out
它提供了儿童过程和基本视角的基本视图。等等可能有用。
正如@alk所评论的，使用SIGCHLD信号处理程序是另一种调用wait的方法，它可能更简单，但似乎有诀窍，并且容易出错。
以下是基于我有限使用SIGCHLD信号的知识的一些描述，只需将其作为提示，而不是确切的样本。
如何使用SIGCHID signal：
默认情况下，进程会忽略SIGCHID信号，但可以在其上注册处理程序。
由于标准信号暂时被阻止＆amp;没有排队，意味着可以发送多个信号＆amp;这个过程可能只看到它发生一次，
因此，每当收到此信号时，应使用带waitpid()选项的WNOHANG循环来处理所有已终止的子进程。
处理程序函数可能如下所示：
void sigchld_handler() {
int local_errno = errno; // backup errno,
while (waitpid(-1, NULL, WNOHANG) > 0)
continue;
errno = local_errno; // restore errno,
}
在调用folk（）之前，在父进程上注册处理程序：
if(signal(SIGCHLD, sigchld_handler) == SIG_ERR) {
printf("error signal()");
return errno;
}
然后，当子进程终止时，父进程将收到一个SIGCHLD信号，并调用处理函数，等待子进程，从而有助于清除子进程，而不是让它成为僵尸。 / p>