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我有以下代碼草稿。如何將fork()後的命令行參數傳遞給子進程
#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;
}
如何將命令行參數傳遞給子進程?例如,運行./app alch.txt
我想
sprintf(tmp, "cat `tail -f %s`", argv[1]);
生產
cat `tail -f alch.txt`
tmp中
。
完全像你這樣做?你的代碼很好。你遇到的問題究竟是什麼? –