我的程序基本上運行帶有命令行參數的可執行文件。 子進程分叉,子進程的輸出在文件「filename」中進行。只能由root用戶打開文件..給出錯誤的允許,我猜
的問題是該文件提出,並寫入數據,但只能由root用戶打開.. 怎樣才能使它可讀性誰調用該程序的用戶?
的代碼是: -
#include<stdio.h>
#include<string.h> //strcpy() used
#include<malloc.h> //malloc() used
#include<unistd.h> //fork() used
#include<stdlib.h> //exit() function used
#include<sys/wait.h> //waitpid() used
#include<fcntl.h>
int main(int argc, char **argv)
{
char *command;
char input[256];
char **args=NULL;
char *arg;
int count=0;
char *binary;
pid_t pid;
int fdw;
printf("Enter the name of the executable(with full path)");
fgets(input,256,stdin);
command = malloc(strlen(input));
strncpy(command,input,strlen(input)-1);
binary=strtok(command," ");
args=malloc(sizeof(char*));
args[0]=malloc(strlen(binary)+1);
strcpy(args[0],binary);
while ((arg=strtok(NULL," "))!=NULL)
{
if (count%10 == 0) args=realloc(args,sizeof(char*)*10);
count++;
args[count]=malloc(strlen(arg));
strcpy(args[count],arg);
}
args[++count]=NULL;
if ((fdw=open("filename",O_WRONLY|O_EXCL|O_CREAT|0700)) == -1)
perror("Error making file");
close(1);
dup(fdw);
if ((pid = fork()) == -1)
{
perror("Error forking...\n");
exit(1);
}
if (pid == 0) execvp(args[0],&args[0]);
else
{
int status;
waitpid(-1, &status, 0);
}
return 0;
}
ls -l指向文件時會說什麼? – bmargulies
------ xr-- 1 shadyabhi shadyabhi 7342 2010-02-03 01:39文件名稱 –