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#define CLONE_FS 0x00000200 ¹²Ïí¸ùĿ¼ºÍµ±Ç°¹¤×÷Ŀ¼ËùÔÚµÄ±í£¬ÒÔ¼°ÓÃÓÚÆÁ±ÎÐÂÎÄ»¯³õʼÐí¿ÉÖ¤µÄλÑÚÂëÖµ
#define CLONE_FILES 0x00000400 ¹²Ïí´ò¿ªÎļþ±í
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#define CLONE_VFORK 0x00004000 ÔÚ·¢³övfork()ϵͳµ÷ÓÃʱÉèÖÃ
#define CLONE_PARENT 0x00008000 ÉèÖÃ×Ó½ø³ÌµÄ¸¸½ø³Ì£¨½ø³ÌÃèÊö·ûÖеÄparentºÍreal_parent×ֶΣ©Îªµ÷Óýø³ÌµÄ¸¸½ø³Ì
#define CLONE_THREAD 0x00010000 °Ñ×Ó½ø³Ì²åÈëµ½¸¸½ø³ÌµÄͬһÏß³Ì×éÖУ¬²¢ÆÈʹ×Ó½ø³Ì¹²Ïí¸¸½ø³ÌµÄÐźÅÃèÊö·û£¬Òò´ËÒ²ÉèÖÃ×Ó½ø³ÌµÄtgid×ֶκÍgroup_leader×ֶΡ£Èç¹ûÕâ¸ö±ê־λΪtrue,¾Í±ØÐëÉèÖÃCLONE_SIGHAND±êÖ¾
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