编写自主shell.
#include<stdio.h>
#include<sys/wait.h>
#include<unistd.h>
#include<stdlib.h>
#include<string.h>
int main()
{
char buf[1024] = { 0 };
while(1)
{
printf("mysell#");
fflush(stdout);
size_t s = read( 0, buf, sizeof( buf ) );
if(s > 0)
{
buf[s - 1] = '\0';
printf("%s\n", buf);
}
char* start = buf;
char* _argv[32];
_argv[0] = buf;
int i = 1;
while(*start)
{
if(*start == ' ')
{
*start = '\0';
start ++;
_argv[i++] = start;
}
else
{
start ++;
}
}
_argv[i] = NULL;
pid_t pid;
pid = fork();
if(pid < 0)
{
perror("fork");
exit(1);
}
if(pid == 0)
{
execvp(_argv[0], _argv);
}
else if(pid > 0)
{
int st = 0;
wait(&st);
}
}
return 0;
}
