????UNIX????????
???????????? ???????[ 2014/9/15 11:42:48 ] ???????????????
????UNIX??????????????????ж???????POSIX.1??XPG3?????????????POSIX.1??XPG3??????????????????Щ????????????????????????塣????????????????????????????POSIX???????????κ??????????????????????峣??_POSIX_SOURCE??????POSIX.1?????ж??????????????ó????????????????κ??????е???塣
????????_POSIX_SOURCE??????????_XOPEN_SOURCE???????????????(feature test macro)?????й??????????????????????????????????cc?????????????з?????壺
????cc -D_POSIX_SOURCE file.c
???????????C????????κ??????????????????????????????????POSIX.1???壬??????????????????????????
????#define _POSIX_SOURCE 1
????????????????????__STDC__?????????ANSI C?????????????????塣?????????????дANSI C?????????ANSI C???????????????????磬???????????????
void *myfunc(const char*?? int);
#else
void *myfunc();
#endif
#ifdef __STDC__
void *myfunc(const char*?? int);
#else
void *myfunc();
#endif
?????????????ANSI C?????????????????????????????????????????????????????????????
??????
???·???
??????????????????
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2021/5/28 17:25:47??????APP??????????
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