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CONFSTRSection: Linux Programmer's Manual (3)Updated: April 17, 1993 Index Return to Main Contents ̾Á°confstr - ¥³¥ó¥Õ¥£¥°¥ì¡¼¥·¥ç¥ó¤Ë°Í¸¤·¤¿Ê¸»úÎóÊÑ¿ô¤Î¼èÆÀ½ñ¼°#define _POSIX_C_SOURCE 2 ¤Þ¤¿¤Ï #define _XOPEN_SOURCE #include <unistd.h> size_t confstr(int name, char *buf, size_t len); ÀâÌÀconfstr() ¤Ï¥³¥ó¥Õ¥£¥°¥ì¡¼¥·¥ç¥ó¤Ë°Í¸¤·¤¿Ê¸»úÎóÊÑ¿ô¤ÎÃͤò¼èÆÀ¤¹¤ë¡£°ú¿ô name ¤ÏÌ䤤¹ç¤ï¤»¤Î¤¿¤á¤Î¥·¥¹¥Æ¥àÊÑ¿ô¤Ç¤¢¤ë¡£ ¼¡¤ÎÊÑ¿ô¤¬¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤ë¡£
buf ¤¬ NULL ¤Ç¤Ê¤¯¡¢¤«¤Ä len ¤¬0¤Ç¤Ê¤±¤ì¤Ð confstr() ¤Ï¼èÆÀ¤·¤¿Ê¸»úÎó¤ÎÆâÍÆ¤ò buf ¤Ë¥³¥Ô¡¼¤¹¤ë¡£É¬Íפʤé¤ÐŤµ¤Ï len - 1 ʸ»ú¤ËÀÚ¤ê¼Î¤Æ¤é¤ì¤Æ¥Ì¥ëʸ»ú¤Ç½ªÃ¼¤µ¤ì¤ë¡£ ¤³¤ì¤Ï confstr() ¤ÎÊÖ¤êÃͤò len ¤òÈæ³Ó¤·¤ÆÈ½Äê¤Ç¤¤ë¡£ ¤â¤· len ¤¬0¤Ç buf ¤¬ NULL ¤Ê¤é¤Ð confstr() ¤Ï¾å¤ÇÄêµÁ¤µ¤ì¤¿ÃÍ(ÌõÃí: ÀÚ¤ê¼Î¤Æ¤ëÁ°¤Î¡¢¼èÆÀ¤·¤¿Ê¸»úÎó¤ÎŤµ)¤òÊÖ¤¹¡£ ÊÖ¤êÃͤ⤷ name ¤¬Àµ¤·¤¤¥³¥ó¥Õ¥£¥°¥ì¡¼¥·¥ç¥óÊÑ¿ô¤ËÂбþ¤·¤Æ¤¤¤Ê¤±¤ì¤Ð¡¢ confstr() ¤Ï0¤òÊÖ¤¹¡£Î㼡¤ÎÉôʬŪ¤Ê¥³¡¼¥É¤ÏPOSIX.2¥·¥¹¥Æ¥à¤Î¥æ¡¼¥Æ¥£¥ê¥Æ¥£¤¬¤¢¤ë¥Ñ¥¹ ¤ò·èÄꤹ¤ë¡£char *pathbuf; size_t n; n = confstr(_CS_PATH,NULL,(size_t)0); if ((pathbuf = malloc(n)) == NULL) abort(); confstr(_CS_PATH, pathbuf, n); ¥¨¥é¡¼¤â¤· name ¤ÎÃͤ¬ÉÔÀµ¤Ç¤¢¤Ã¤¿¤Ê¤é¤Ð¡¢ errno ¤¬ EINVAL ¤Ë¥»¥Ã¥È¤µ¤ì¤ë¡£CONFORMS TOPOSIX.2¤ÇÄ󰯤µ¤ì¤¿¡£¥Ð¥°POSIX.2¤Ï¤Þ¤À¾µÇ§¤µ¤ì¤¿É¸½à¤Ë¤Ï¤Ê¤Ã¤Æ¤¤¤Ê¤¤¤Î¤Ç¡¢ ¤³¤Î¥Þ¥Ë¥å¥¢¥ë¤ÎÆâÍÆ¤ÏÊѹ¹¤µ¤ì¤ë¤Ç¤¢¤í¤¦¡£´ØÏ¢¹àÌÜsh(1), exec(3), system(3)
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