logo
Redian新闻
>未名空间
>Unix - 噫吁兮，危乎高哉
>
A problem about child process.
avatar
A problem about child process.# Unix - 噫吁兮，危乎高哉
l*t
1 楼
if( (pid = fork()) == 0 )}
.....
i = execvp(xxx,xxxxx[]);
if( i == -1 ){
printf("error!");
//kill(pid,9) ???
}
}
ps
1201 proc1
1203 proc1
.....
when execvp fail, the child process 1203 is
still runing,if I use kill when fail,the
process 1201 will be killed too.
How can I kill 1203 only when exec fail?
thanks!
avatar
l*l
2 楼
When you kill(pid,9), the parent and child use same file_descript in pages,
that is from your fork source. So you can't kill the child simply, you can
fork for an other time and the child of child can be stoped.

【在 l***t 的大作中提到】
: if( (pid = fork()) == 0 )}
: .....
: i = execvp(xxx,xxxxx[]);
: if( i == -1 ){
: printf("error!");
: //kill(pid,9) ???
: }
: }
: ps
: 1201 proc1
avatar
w*n
3 楼

why not use exit()?
if (fork()==0){
execvp(...);
exit();
}
There is no need to test the return value of exec.

【在 l***t 的大作中提到】
: if( (pid = fork()) == 0 )}
: .....
: i = execvp(xxx,xxxxx[]);
: if( i == -1 ){
: printf("error!");
: //kill(pid,9) ???
: }
: }
: ps
: 1201 proc1
avatar
j*y
4 楼

you are calling kill(0, 9);
check the man page of kill, process 0 has special meaning.

【在 l***t 的大作中提到】
: if( (pid = fork()) == 0 )}
: .....
: i = execvp(xxx,xxxxx[]);
: if( i == -1 ){
: printf("error!");
: //kill(pid,9) ???
: }
: }
: ps
: 1201 proc1
相关阅读
Unix下的中文日历?怎么在FTP里改变文件属性? About the serial port--SOS!SOS!a difficult question[转载] emacs下编译程序,怎么指定路径?unix下如何知道一个程序进行了多少浮点运算 (null)how to recover the Inbox from emacs?CXterm help!怎么回事?!UNIX上如何把一个文件发送到另外一台机器的某portHelp pls, Solaris administrator's exam.基于Unix的断点续传软件请教后台运行How to know the physical memory address?help!!! pipe programSecureNetterm安装SOLORIS8 FOR INTEL时，选择安装的目的盘遇到的问题[转载] CUPS下HP932C配制问题求教is there a unix command named "tilderm"? how to uhow to change time of file
logo
联系我们隐私协议©2024 redian.news
Redian新闻
Redian.news刊载任何文章，不代表同意其说法或描述，仅为提供更多信息，也不构成任何建议。文章信息的合法性及真实性由其作者负责，与Redian.news及其运营公司无关。欢迎投稿，如发现稿件侵权，或作者不愿在本网发表文章，请版权拥有者通知本网处理。