c调用外部程序

函数名称: spawnl、spawnle、spawnlp、spawnlpe、spawnv、spawnve、spawnvp、spawnvpe
函数原型: int spawnl(int mode, char *path, char *arg 0, … )
  int spawnle(int mode, char *path, char *arg0, … )
  int spawnlp(int mode, char *path, char *arg0, … )
  int spawnlpe(int mode, char *path, char *arg0, … )
  int spawnv(int mode, char *path, char *argv[])
  int spawnve(int mode, char *path, char *argv[], char **env)
  int spawnvp(int mode, char *path, char *argv[])
  int spawnvpe(int mode, char *path, char *argv[], char **env)
函数功能: 在一个程序中调用另外一个程序
函数返回: -1:调用失败，0:调用成功
参数说明: path-被调用程序路径，arg-调用的参数,mode-调用模式，具体如下：
  P_WAIT 0 将父过程挂起，直到子过程执行完毕
  P_NOWAIT 1 父子过程同时执行，Turboc不支持
  P_OVERLAY 2 子过程覆盖父过程
所属文件: <process.h>

C/C++ code

    
    
    
    

     
     
     
      #include 
     
     
     
     <
     
     
     
     stdio.h
     
     
     
     >
     
     
     
      #include 
     
     
     
     <
     
     
     
     stdlib.h
     
     
     
     >
     
     
     
      #include 
     
     
     
     <
     
     
     
     process.h
     
     
     
     >
     
     
     
      #include 
     
     
     
     <
     
     
     
     errno.h
     
     
     
     >
     
     
     
      #include 
     
     
     
     <
     
     
     
     string
     
     
     
     .h
     
     
     
     >
     
     
     
      
     
     
     
     int
     
     
     
      main() { 
     
     
     
     int
     
     
     
      process_id; 
     
     
     
     #if
     
     
     
      defined(__OS2__)||defined(__NT__)
     
     
     
      
     
     
     
     int
     
     
     
      status, rc; 
     
     
     
     #endif
     
     
     
      process_id
     
     
     
     =
     
     
     
     spawnl(P_NOWAIT,
     
     
     
     "
     
     
     
     child.exe
     
     
     
     "
     
     
     
     ,
     
     
     
     "
     
     
     
     child
     
     
     
     "
     
     
     
     ,
     
     
     
     "
     
     
     
     5
     
     
     
     "
     
     
     
     ,NULL); 
     
     
     
     if
     
     
     
     (process_id
     
     
     
     ==-
     
     
     
     1
     
     
     
     ){ printf(
     
     
     
     "
     
     
     
     spawn failed-%s/n
     
     
     
     "
     
     
     
     ,strerror(errno)); exit(EXIT_FAILURE); } printf(
     
     
     
     "
     
     
     
     Process id=%d/n
     
     
     
     "
     
     
     
     ,process_id); 
     
     
     
     #if
     
     
     
      defined(__OS2__)||defined(__NT__)
     
     
     
      rc
     
     
     
     =
     
     
     
     cwait(
     
     
     
     &
     
     
     
     status,process_id,WAIT_CHILD); 
     
     
     
     if
     
     
     
     (rc
     
     
     
     ==-
     
     
     
     1
     
     
     
     ){ printf(
     
     
     
     "
     
     
     
     wait failed-%s/n
     
     
     
     "
     
     
     
     ,strerror(errno)); }
     
     
     
     else
     
     
     
     { printf(
     
     
     
     "
     
     
     
     wait succeeded-%x/n
     
     
     
     "
     
     
     
     ,status); 
     
     
     
     switch
     
     
     
     (status
     
     
     
     &
     
     
     
     0xff
     
     
     
     ){ 
     
     
     
     case
     
     
     
      
     
     
     
     0
     
     
     
     : printf(
     
     
     
     "
     
     
     
     Normal termination code=%d/n
     
     
     
     "
     
     
     
     ,status
     
     
     
     >>
     
     
     
     8
     
     
     
     ); 
     
     
     
     break
     
     
     
     ; 
     
     
     
     case
     
     
     
      
     
     
     
     1
     
     
     
     : printf(
     
     
     
     "
     
     
     
     Hard-error abort/n
     
     
     
     "
     
     
     
     ); 
     
     
     
     break
     
     
     
     ; 
     
     
     
     case
     
     
     
      
     
     
     
     2
     
     
     
     : printf(
     
     
     
     "
     
     
     
     Trap operation/n
     
     
     
     "
     
     
     
     ); 
     
     
     
     break
     
     
     
     ; 
     
     
     
     case
     
     
     
      
     
     
     
     3
     
     
     
     : printf(
     
     
     
     "
     
     
     
     SIGTERM signal not intercepted/n
     
     
     
     "
     
     
     
     ); 
     
     
     
     break
     
     
     
     ; 
     
     
     
     default
     
     
     
     : printf(
     
     
     
     "
     
     
     
     Bogus return status/n
     
     
     
     "
     
     
     
     ); } } 
     
     
     
     #endif
     
     
     
      printf(
     
     
     
     "
     
     
     
     spawn completed/n
     
     
     
     "
     
     
     
     ); 
     
     
     
     return
     
     
     
      
     
     
     
     0
     
     
     
     ; } 
     
     
     
     /*
     
     
     
      [child.c] #include <stdio.h> #include <stdlib.h> #include <dos.h> int main(int argc,char *argv[]) { int delay; if(argc<=1) exit(EXIT_FAILURE); delay=atoi(argv[1]); printf("I am a child going to sleep for %d seconds/n",delay); sleep(delay); printf("I am a child awakening/n"); exit(123); return 0; }
    
    
    
    
    
    
    
    

     
     
     
     http://www.programfan.com/club/showtxt.asp?id=198953