????????????????????????????????????????????????uid_t ??? gid_t ???????????? long (32 ??????????????????) ??? int (64 ??????????????????) ????????? uint32_t ????????????????????????????????????????????????????????????Solaris Express Developer Edition ????????????????????????uid_t ??? gid_t ??????????????????
??????????????????????????????
????????????????????????????????????????????????????????????????????? uid_t ??? gid_t ???????????????????????????
?????????????????????????????????
1 #include <unistd.h> 2 #include <stdlib.h> 3 #include <stdio.h> 4 5 int 6 main(void) 7 { 8 uid_t negone = -1; 9 10 if (getuid() < 0) 11 exit(1); 12 13 (void) setreuid(negone, getuid()); 14 15 (void) printf("%ld\n", getuid()); 16 17 return (0); 18 } |
Sun ??? Studio 11 ?????????????????????????????????
"uid.c", line 8: warning: initializer does not fit or is out of range: -1" |
Studio 11 lint ????????????????????????
((8) warning: constant truncated by assignment |
(8) warning: initializer will be sign-extended: -1 |
(10) warning: suspicious comparison of unsigned with 0: op "<" |
function argument ( number ) type inconsistent with format |
|
gcc -Wall -Wextra ????????????????????????
uid.c:10: warning: comparison of unsigned expression < 0 is always false |
uid.c:15: warning: long int format, uid_t arg (arg 2) |
???????????? C ????????????????????????????????????????????????????????????????????????????????????
uid_t ??? gid_t ????????????????????? C++ ?????????????????????????????????????????????
??? C ?????????????????????C++ ??????????????????????????????????????????????????????????????????????????????????????? uid_t ??? gid_t ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
?????? Solaris ????????????????????????????????? C++ ?????????????????????????????? Solaris ?????????????????????