如何在 fork() 之后将命令行参数传递给子进程
我有以下代码草案。
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
printf( "usage: %i filename", argc );
pid_t pID = fork();
if (pID == 0) // child
{
// Code only executed by child process
printf("Child PID: %i", pID);
int file = open("/tmp/rtail", O_CREAT | O_WRONLY);
//Now we redirect standard output to the file using dup2
dup2(file,1);
char tmp[30];
sprintf(tmp, "cat `tail -f %s`", argv[1]);
}
else if (pID < 0) // failed to fork
{
printf("Failed to fork");
exit(1);
// Throw exception
}
else // parent
{
}
// Code executed by both parent and child.
return 0;
}
如何将命令行参数传递给子进程？例如，运行 ./app alch.txt 我想
sprintf(tmp, "cat `tail -f %s`", argv[1]);
在 tmp 中生成
cat `tail -f alch.txt`
。
I have the following code draft.
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
printf( "usage: %i filename", argc );
pid_t pID = fork();
if (pID == 0) // child
{
// Code only executed by child process
printf("Child PID: %i", pID);
int file = open("/tmp/rtail", O_CREAT | O_WRONLY);
//Now we redirect standard output to the file using dup2
dup2(file,1);
char tmp[30];
sprintf(tmp, "cat `tail -f %s`", argv[1]);
}
else if (pID < 0) // failed to fork
{
printf("Failed to fork");
exit(1);
// Throw exception
}
else // parent
{
}
// Code executed by both parent and child.
return 0;
}
How do I pass command line arguments to a child process? For example, running ./app alch.txt I want
sprintf(tmp, "cat `tail -f %s`", argv[1]);
to produce
cat `tail -f alch.txt`
in tmp.
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评论（2）
你不需要做任何特别的事情；
fork确保每个进程获取所有局部变量，包括argv。You don't need to do anything special;
forkensures that each process gets all local variables, includingargv.抱歉给您带来麻烦，它确实工作得很好。我的早期版本由于某种原因无法工作，但显然我已经更改了一些内容以使其正确。下次提问前会运行我的代码。
Sorry for the trouble, it indeed works fine. My earlier version didn't work for some reason, but apparently I've changed something to make it right. Will run my code before a question next time.