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Linux ÌṩÁË popen ºÍ pclose º¯Êý (1)£¬ÓÃÓÚ´´½¨ºÍ¹Ø±Õ¹ÜµÀÓëÁíÍâÒ»¸ö½ø³Ì½øÐÐͨÐÅ¡£Æä½Ó¿ÚÈçÏ£º
FILE *popen(const char *command£¬ const char *mode);
int pclose(FILE *stream);
Òź¶µÄÊÇ£¬popen ´´½¨µÄ¹ÜµÀÖ»ÄÜÊǵ¥ÏòµÄ -- mode Ö»ÄÜÊÇ "r" »ò "w" ¶ø²»ÄÜÊÇijÖÖ×éºÏ--Óû§Ö»ÄÜÑ¡ÔñҪôÍùÀïд£¬ÒªÃ´´ÓÖжÁ£¬¶ø²»ÄÜͬʱÔÚÒ»¸ö¹ÜµÀÖнøÐжÁд¡£Êµ¼ÊÓ¦ÓÃÖУ¬¾­³£»áÓÐͬʱ½øÐжÁдµÄÒªÇ󣬱ÈÈ磬ÎÒÃÇ¿ÉÄÜÏ£Íû°ÑÎı¾Êý¾ÝËÍÍùsort¹¤¾ßÅÅÐòºóÔÙÈ¡»Ø½á¹û¡£´Ëʱpopen¾ÍÎÞ·¨ÓÃÉÏÁË¡£ÎÒÃÇÐèҪѰÕÒÆäËüµÄ½â¾ö·½°¸¡£
ÓÐÒ»ÖÖ½â¾ö·½°¸ÊÇʹÓà pipe º¯Êý (2)´´½¨Á½¸öµ¥Ïò¹ÜµÀ¡£Ã»ÓдíÎó¼ì²âµÄ´úÂëʾÒâÈçÏ£º
int pipe_in[2], pipe_out[2];
pid_t pid;
pipe(&pipe_in); // ´´½¨¸¸½ø³ÌÖÐÓÃÓÚ¶ÁÈ¡Êý¾ÝµÄ¹ÜµÀ
pipe(&pipe_out); // ´´½¨¸¸½ø³ÌÖÐÓÃÓÚдÈëÊý¾ÝµÄ¹ÜµÀ
if ( (pid = fork()) == 0) { // ×Ó½ø³Ì
close(pipe_in[0]); // ¹Ø±Õ¸¸½ø³ÌµÄ¶Á¹ÜµÀµÄ×Ó½ø³Ì¶Á¶Ë
close(pipe_out[1]); // ¹Ø±Õ¸¸½ø³ÌµÄд¹ÜµÀµÄ×Ó½ø³Ìд¶Ë
dup2(pipe_in[1], STDOUT_FILENO); // ¸´ÖƸ¸½ø³ÌµÄ¶Á¹ÜµÀµ½×Ó½ø³ÌµÄ±ê×¼Êä³ö
dup2(pipe_out[0], STDIN_FILENO); // ¸´ÖƸ¸½ø³ÌµÄд¹ÜµÀµ½×Ó½ø³ÌµÄ±ê×¼ÊäÈë
close(pipe_in[1]); // ¹Ø±ÕÒѸ´ÖƵĶÁ¹ÜµÀ
close(pipe_out[0]); // ¹Ø±ÕÒѸ´ÖƵÄд¹ÜµÀ
/* ʹÓÃexecÖ´ÐÐÃüÁî */
} else { // ¸¸½ø³Ì
close(pipe_in[1]); // ¹Ø±Õ¶Á¹ÜµÀµÄд¶Ë
close(pipe_out[0]); // ¹Ø±Õд¹ÜµÀµÄ¶Á¶Ë
/* ÏÖÔÚ¿ÉÏòpipe_out[1]ÖÐдÊý¾Ý£¬²¢´Ópipe_in[0]ÖжÁ½á¹û */
close(pipe_out[1]); // ¹Ø±Õд¹ÜµÀ
/* ¶ÁÈ¡pipe_in[0]ÖеÄÊ£ÓàÊý¾Ý */
close(pipe_in[0]); // ¹Ø±Õ¶Á¹ÜµÀ
/* ʹÓÃwaitϵÁк¯ÊýµÈ´ý×Ó½ø³ÌÍ˳ö²¢È¡µÃÍ˳ö´úÂë */
}
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