GETCWD

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#include <unistd.h>

char *getcwd(char *buf, size_t size);
char *get_current_dir_name(void);
char *getwd(char *buf);

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buf ¤¬ NULL ¤Î¾ì¹ç¡¢ getcwd() ¤ÎÆ°ºî¤Ï̤ÄêµÁ¤Ç¤¢¤ë¡£ POSIX.1 ɸ½à¤Î³ÈÄ¥¤È¤·¤Æ¡¢ Linux (libc4, libc5, glibc)¤Ç¤Ï¸Æ¤Ó¤À¤·»þ¤Ë buf ¤Ë NULL ¤òÍ¿¤¨¤ë¤³¤È¤Ç getcwd() ¤¬É¬ÍפʥХåե¡¤ò malloc() ÍѤ¤¤ÆưŪ¤Ë³ÍÆÀ¤¹¤ë¤è¤¦¤Ç¤­¤ë¡£ ¤³¤Î¾ì¹ç¡¢ size ¤¬ 0 ¤Î¾ì¹ç¤ò½ü¤­¥Ð¥Ã¥Õ¥¡¤ÎŤµ¤Ï size ¤È¤Ê¤ë¡£ size ¤¬ 0 ¤Î¾ì¹ç¤Ë¤ÏɬÍפÊÂ礭¤µ¤¬³ÎÊݤµ¤ì¤ë¡£ ¤³¤ÎÊýË¡¤Ç³ÍÆÀ¤·¤¿¥Ð¥Ã¥Õ¥¡¤Ï free() ¤Ç²òÊü¤¹¤ë¤³¤È¤¬²Äǽ¤Ç¤¢¤ë(¤·¡¢¤½¤¦¤¹¤ë¤Î¤¬¸­ÌÀ¤À)¡£

_GNU_SOURCE ¤¬ define ¤µ¤ì¤Æ¤¤¤ì¤Ð¡¢ get_current_dir_name ¤¬¥×¥í¥È¥¿¥¤¥×Àë¸À¤µ¤ì¤ë¡£¤³¤Î´Ø¿ô¤Ï¥«¥ì¥ó¥È¥Ç¥£¥ì¥¯¥È¥ê̾ ¤ò¼ý¤á¤ë¤Î¤Ë½½Ê¬¤ÊÂ礭¤µ¤ÎÇÛÎó¤ò malloc(3) ¤Ç³ÍÆÀ¤¹¤ë¡£´Ä¶­ÊÑ¿ô PWD ¤¬ÀßÄꤵ¤ì¤Æ¤ª¤ê¤½¤ÎÃͤ¬Àµ¤·¤±¤ì¤Ð¡¢¤½¤ÎÃͤ¬ÊÖ¤µ¤ì¤ë¡£

_BSD_SOURCE ¤Þ¤¿¤Ï _XOPEN_SOURCE_EXTENDED ¤¬define¤µ¤ì¤Æ¤¤¤ì¤Ð getwd ¤¬¥×¥í¥È¥¿¥¤¥×Àë¸À¤µ¤ì¤ë¡£ ¤³¤Î´Ø¿ô¤Ï malloc(3) ¤Ë¤è¤ë¥á¥â¥ê³ÍÆÀ¤ò°ìÀڹԤʤï¤Ê¤¤¡£ buf °ú¿ô¤Ï¾¯¤Ê¤¯¤È¤â PATH_MAX ¥Ð¥¤¥È¤ÎŤµ¤ò»ý¤ÄÇÛÎó¤Ø¤Î¥Ý¥¤¥ó¥¿¤Ç¤¢¤ëɬÍפ¬¤¢¤ë¡£ getwd ¤Ï¼ÂºÝ¤Î¥Ñ¥¹Ì¾¤ÎÀèƬ PATH_MAX ¥Ð¥¤¥È¤òÊÖ¤¹¡£  

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