函数原型：
#include <sys/stat.h>
int mkdir(const char *path, mode_t mode);
参数：
path是目录名
mode是目录权限
返回值：
返回0 表示成功， 返回 -1表示错误，，并且会设置errno值。
mode模式位：
mode 表示新目录的权限，可以取以下值：
S_IRUSR S_IREAD
S_IWUSR S_IWRITE S_IXUSR S_IEXEC S_IRWXU This is equivalent to (S_IRUSR | S_IWUSR | S_IXUSR). S_IRGRP Read permission bit for the group owner of the file. Usually 040. S_IWGRP Write permission bit for the group owner of the file. Usually 020. S_IXGRP Execute or search permission bit for the group owner of the file. Usually 010. S_IRWXG This is equivalent to (S_IRGRP | S_IWGRP | S_IXGRP). S_IROTH Read permission bit for other users. Usually 04. S_IWOTH Write permission bit for other users. Usually 02. S_IXOTH Execute or search permission bit for other users. Usually 01. S_IRWXO This is equivalent to (S_IROTH | S_IWOTH | S_IXOTH). S_ISUID This is the set-user-ID on execute bit, usually 04000. See How Change Persona. S_ISGID This is the set-group-ID on execute bit, usually 02000. See How Change Persona. S_ISVTX This is the sticky bit, usually 01000.
例子：
#include <sys/types.h> #include <sys/stat.h> int status;
status = mkdir(“/home/newdir”, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
这样就创建了一个newdir目录，权限通过ls -al 查看为
drwxr-xr-x
跟用linux命令mkdir创建的目录权限位一致。
战胜困难，走出困境，成功就会属于你。
