我正在尝试编写外壳程序。但是我的 shell 不执行命令 - ls -l | 较少的。我正在使用 execvp。代码如下。
#include <stdio.h>
#include <unistd.h>
#include <string.h>
int main(){
int pid, status, num, len;
char str[1000], cwd[100];
char* word[100];
getcwd(cwd, sizeof(cwd));
while(1){
chdir(cwd);
printf("%s > ", cwd);
gets(str);
pid=vfork();
if(pid == 0){
num = 0;
word[num] = strtok (str, " ");
while (word[num] != NULL) {
word[num] = strdup (word[num]);
len = strlen (word[num]);
if (strlen (word[num]) > 0)
if (word[num][len-1] == '\n')
word[num][len-1] = '\0';
word[++num] = strtok (NULL, " ");
}
if(strcmp(word[0], "cd") == 0){
chdir(word[1]);
getcwd(cwd, sizeof(cwd));
}
else{
execvp(word[0],word);
}
exit(0);
}
else{
wait(&status);
}
}
return 0;
}