Linux C C man mkdir( ) mkdir Linux man mkdir mkdir( ) mkdir mkdir( )

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1 D Linux

2 Linux E-D.1 Linux C C man mkdir( ) mkdir Linux man mkdir mkdir( ) mkdir mkdir( ) jhchen@aho:~$ man -S 2 mkdir Reformatting mkdir(2), please wait... MKDIR(2) Linux Programmer's Manual MKDIR(2) NAME mkdir - create a directory SYNOPSIS #include <sys/stat.h> #include <sys/types.h> int mkdir(const char *pathname, mode_t mode); DESCRIPTION mkdir attempts to create a directory named pathname. mode specifies the permissions to use. It is modified by the process's umask in the usual way: the permissions of the created file are (mode &~umask). The newly created directory will be owned by the effective uid of the process. If the directory containing the file has the set group id bit set, or if the filesystem is mounted with BSD group semantics, the new directory will E-D-2

3 Linux D inherit the group ownership from its parent; otherwise it will be owned by the effective gid of the process. If the parent directory has the set group id bit set then so will the newly created directory. RETURN VALUE mkdir returns zero on success, or -1 if an error occurred (in which case, errno is set appropriately). ERRORS EPERM The filesystem containing pathname does not support the creation of directories. EEXIST pathname already exists (not necessarily as a directory). This includes the case where pathname is a symbolic link, dangling or not. EFAULT pathname points outside your accessible address space. EACCES The parent directory does not allow write permission to the process, or one of the directories in pathname did not allow search (execute) permission. ENAMETOOLONG pathname was too long. ENOENT A directory component in pathname does not exist or is a dangling symbolic link. ENOTDIR A component used as a directory in pathname is not, in fact, a directory. ENOMEM Insufficient kernel memory was available. EROFS pathname refers to a file on a read-only filesystem. ELOOP Too many symbolic links were encountered in resolving pathname. E-D-3

4 ENOSPC The device containing pathname has no room for the new directory. ENOSPC The new directory cannot be created because the user's disk quota is exhausted. CONFORMING TO SVr4, POSIX, BSD, SYSV, X/OPEN. SVr4 documents additional EIO, EMULTI-HOP and ENOLINK error conditions; POSIX.1 omits ELOOP. There are many infelicities in the protocol underlying NFS. Some of these affect mkdir. SEE ALSO mkdir(1), chmod(2), mknod(2), mount(2), rmdir(2), stat(2), umask(2), unlink(2) Linux MKDIR(2) ANSI C man -S 3 strcpy E-D.2 mkdir( ) #include <sys/stat.h> #include <sys/types.h> int mkdir(const char *pathname, mode_t mode); E-D-4

5 Linux D (1) 0 0 (2) pathname (3) mode mode_t OR OR Linux S_ISUID S_ISGID S_ISVTX S_IRUSR S_IREAD S_IWUSR S_IWRITE S_IXUSR S_IEXEC S_IRGRP S_IWGRP S_IXGRP S_IROTH S_IWOTH S_IXOTH ED_01.cpp E/ED/ED_01.cpp /**** filename:ed_01.cpp *****/ #include <iostream> #include <stdio.h> #include <sys/stat.h> #include <sys/types.h> using namespace std; int main(void) E-D-5

6 { } char *path="./newdir/"; if(mkdir(path, )) cout << "Directory " << path << " is not create!" << endl; else cout << "Directory " << path << " is create!" << endl; return 0; jhchen@aho:~/c_cpp/e/ed$ g++ ED_01.cpp -o ED_01 jhchen@aho:~/c_cpp/e/ed$./ed_01 Directory./newdir/ is create! jhchen@aho:~/c_cpp/e/ed$ ls -l 13 -rwxr-xr-x 1 jhchen kdelab :34 ED_01 -rw-r--r-- 1 jhchen kdelab :34 ED_01.cpp drw-r jhchen kdelab :34 newdir newdir drw-r Linux mkdir -m 640 newdir =00640 E-D.3 Linux System Call man -S 2 E-D-6

7 Linux D int uname (struct utsname *buf); int gethostname (char *name, size_t len); int sethostname xname, size_t len); int sysinfo (struct sysinfo *info); <sys/utsname.h> <sys/sysinfo.h> int statfs(const char * path, struct statfs *buf); <sys/vfs.h> int fstatfs(int fd, struct statfs *buf); int stat(const char *file_ name, struct stat *buf); int fstat(int filedes,struct stat *buf); <sys/stat.h> <sys/types.h> int lstat(const char *file_name, struct stat *buf); int mkdir(const char *pathname, mode_t mode); int rmdir(const char *pathname); <sys/stat.h> <sys/types.h> E-D-7

8 char *getcwd(char *buf, size_t size); char *get_current_ dir_name(void); char *getwd(char *buf); cint chdir (const char *path); int fchdir(int fd); int chmod(const char *path, mode_t mode); <sys/types.h> <sys/stat.h> int fchmod (int fildes, mode_t mode); int link(const char *oldpath, const char *newpath); int unlink(const char *pathname); E-D-8