????????????????????????????????????????????????uid_t ??? gid_t ??????????????? long???32 ???????????????????????? int???64 ?????????????????????????????? uint32_t ??????????????????????????????????????????????????????Solaris Express Developer Editicon ?????????????????????“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 OS ?????????????????? C++ ?????????????????????????????? Solaris ????????????????????????