runcommand.c

LINUX下VI编写的SHELL工具LINUX下VI编写的SHELL工具

//runcommand.c

#include "smallsh.h"

int runcommand(char **cline, int where)
{
	pid_t pid;
 	int status;
         
 	switch(pid = fork())
  	{
   		case -1:
     		perror("smallsh");
      		return(-1);
         case 0:
         	execvp(*cline,cline);
          	perror(*cline);
           	exit(1);
	}
         
 	if(where == BACKGROUND)
  	{
  		printf("[process id %d]\n",pid);
    	return(0);
   	}
    if(waitpid(pid,&status,0) == -1)
    	return (-1);
    else
    	return (status);
}