鍍金池/ 教程/ Linux/ chmod()函數(shù) Unix/Linux
outb()函數(shù) Unix/Linux
getpeername()函數(shù) Unix/Linux
io_setup()函數(shù) Unix/Linux
mknod()函數(shù) Unix/Linux
arch_prctl()函數(shù) Unix/Linux
inotify_add_watch()函數(shù) Unix/Linux
chmod()函數(shù) Unix/Linux
_exit()函數(shù) Unix/Linux
epoll_ctl()函數(shù) Unix/Linux
Unix/Linux系統(tǒng)調(diào)用
futimesat()函數(shù) Unix/Linux
oldolduname()函數(shù) Unix/Linux
sched_rr_get_interval()函數(shù) Unix/Linux
oldstat()函數(shù) Unix/Linux
pselect()函數(shù) Unix/Linux
close()函數(shù) Unix/Linux
add_key()函數(shù) Unix/Linux
clone()函數(shù) Unix/Linux
rename()函數(shù) Unix/Linux
msgop()函數(shù) Unix/Linux
getrlimit()函數(shù) Unix/Linux
linkat()函數(shù) Unix/Linux
ioprio_set()函數(shù) Unix/Linux
insw()函數(shù) Unix/Linux
munlock()函數(shù) Unix/Linux
getgid()函數(shù) Unix/Linux
chdir()函數(shù) Unix/Linux
rmdir()函數(shù) Unix/Linux
ioctl()函數(shù) Unix/Linux
lchown()函數(shù) Unix/Linux
execve()函數(shù) Unix/Linux
epoll_wait()函數(shù) Unix/Linux
fstatat()函數(shù) Unix/Linux
truncate()函數(shù) Unix/Linux
lock()函數(shù) Unix/Linux
outsb()函數(shù) Unix/Linux
chroot()函數(shù) Unix/Linux
kexec_load()函數(shù) Unix/Linux
afs_syscall()函數(shù) Unix/Linux
dup2()函數(shù) Unix/Linux
_newselect()函數(shù) Unix/Linux
inotify_rm_watch()函數(shù) Unix/Linux
recv()函數(shù) Unix/Linux
msgsnd()函數(shù) Unix/Linux
getdtablesize()函數(shù) Unix/Linux
ioperm()函數(shù) Unix/Linux
munmap()函數(shù) Unix/Linux
getpriority()函數(shù) Unix/Linux
sched_get_priority_min()函數(shù) Unix/Linux
outw_p()函數(shù) Unix/Linux
kill()函數(shù) Unix/Linux
lookup_dcookie()函數(shù) Unix/Linux
accept()函數(shù) Unix/Linux
obsolete()函數(shù) Unix/Linux
pread()函數(shù) Unix/Linux
getgroups()函數(shù) Unix/Linux
personality()函數(shù) Unix/Linux
recvfrom()函數(shù) Unix/Linux
putpmsg()函數(shù) Unix/Linux
getgroups()函數(shù) Unix/Linux
remap_file_pages()函數(shù) Unix/Linux
request_key()函數(shù) Unix/Linux
mount()函數(shù) Unix/Linux
sched_setscheduler()函數(shù) Unix/Linux
mkdirat()函數(shù) Unix/Linux
nfsservctl()函數(shù) Unix/Linux
getuid()函數(shù) Unix/Linux
prof()函數(shù) Unix/Linux
exit_group函數(shù) Unix/Linux
io_cancel()函數(shù) Unix/Linux
mmap()函數(shù) Unix/Linux
mremap()函數(shù) Unix/Linux
getitimer()函數(shù) Unix/Linux
unimplemented()函數(shù) Unix/Linux
read()函數(shù) Unix/Linux
inl()函數(shù) Unix/Linux
posix_fadvise()函數(shù) Unix/Linux
open()函數(shù) Unix/Linux
listen()函數(shù) Unix/Linux
io_destroy()函數(shù) Unix/Linux
acct()函數(shù) Unix/Linux
fcntl()函數(shù) Unix/Linux
recvmsg()函數(shù) Unix/Linux
statfs()函數(shù) Unix/Linux
oldlstat()函數(shù) Unix/Linux
outb()函數(shù) Unix/Linux
getpagesize()函數(shù) Unix/Linux
sched_yield()函數(shù) Unix/Linux
outw()函數(shù) Unix/Linux
inw_p()函數(shù) Unix/Linux
setpgid()函數(shù) Unix/Linux
quotactl()函數(shù) Unix/Linux
prctl()函數(shù) Unix/Linux
fattach()函數(shù) Unix/Linux
readahead()函數(shù) Unix/Linux
msgget()函數(shù) Unix/Linux
gethostname()函數(shù) Unix/Linux
semctl()函數(shù) Unix/Linux
munlockall()函數(shù) Unix/Linux
iopl()函數(shù) Unix/Linux
fdetach()函數(shù) Unix/Linux
getuid()函數(shù) Unix/Linux
gettid()函數(shù) Unix/Linux
pwrite()函數(shù) Unix/Linux
isastream()函數(shù) Unix/Linux
get_thread_area()函數(shù) Unix/Linux
mpx()函數(shù) Unix/Linux
io_getevents()函數(shù) Unix/Linux
lstat()函數(shù) Unix/Linux
readv()函數(shù) Unix/Linux
exit()函數(shù) Unix/Linux
inw()函數(shù) Unix/Linux
fchmod()函數(shù) Unix/Linux
mq_getsetattr()函數(shù) Unix/Linux
get_robust_list()函數(shù) Unix/Linux
_llseek()函數(shù) Unix/Linux
gettimeofday()函數(shù) Unix/Linux
nice()函數(shù) Unix/Linux
security()函數(shù) Unix/Linux
sched_get_priority_max()函數(shù) Unix/Linux
outb_p()函數(shù) Unix/Linux
intro()函數(shù) Unix/Linux
alarm()函數(shù) Unix/Linux
putmsg()函數(shù) Unix/Linux
fork()函數(shù) Unix/Linux
getpgrp()函數(shù) Unix/Linux
link()函數(shù) Unix/Linux
getcwd()函數(shù) Unix/Linux
insl()函數(shù) Unix/Linux
getsockname()函數(shù) Unix/Linux
dup()函數(shù) Unix/Linux
connect()函數(shù) Unix/Linux
select()函數(shù) Unix/Linux
futex()函數(shù) Unix/Linux
outsw()函數(shù) Unix/Linux
query_module()函數(shù) Unix/Linux
reboot()函數(shù) Unix/Linux
create_module()函數(shù) Unix/Linux
adjtimex()函數(shù) Unix/Linux
mlock()函數(shù) Unix/Linux
statvfs()函數(shù) Unix/Linux
gtty()函數(shù) Unix/Linux
epoll_create()函數(shù) Unix/Linux
bind()函數(shù) Unix/Linux
inl_p()函數(shù) Unix/Linux
select_tut()函數(shù) Unix/Linux
mincore()函數(shù) Unix/Linux
getresuid()函數(shù) Unix/Linux
getpmsg()函數(shù) Unix/Linux
getcontext()函數(shù) Unix/Linux
killpg()函數(shù) Unix/Linux
olduname()函數(shù) Unix/Linux
openat()函數(shù) Unix/Linux
pause()函數(shù) Unix/Linux
alloc_hugepages()函數(shù) Unix/Linux
ioctl_list()函數(shù) Unix/Linux
readlinkat()函數(shù) Unix/Linux
mprotect()函數(shù) Unix/Linux
getdomainname()函數(shù) Unix/Linux
readlink()函數(shù) Unix/Linux
madvise()函數(shù) Unix/Linux
bdflush()函數(shù) Unix/Linux
ipc()函數(shù) Unix/Linux
ptrace()函數(shù) Unix/Linux
getrusage()函數(shù) Unix/Linux
msync()函數(shù) Unix/Linux
faccessat()函數(shù) Unix/Linux
modify_ldt()函數(shù) Unix/Linux
get_kernel_syms()函數(shù) Unix/Linux
getpid()函數(shù) Unix/Linux
fsync()函數(shù) Unix/Linux
msgctl()函數(shù) Unix/Linux
break未實(shí)現(xiàn) Unix/Linux
sched_setparam()函數(shù) Unix/Linux
fchown()函數(shù) Unix/Linux
cacheflush()函數(shù) Unix/Linux
fdatasync()函數(shù) Unix/Linux
flock()函數(shù) Unix/Linux
pivot_root()函數(shù) Unix/Linux
inotify_init()函數(shù) Unix/Linux
fchmodat()函數(shù) Unix/Linux
keyctl()函數(shù) Unix/Linux
llseek()函數(shù) Unix/Linux
outb()函數(shù) Unix/Linux
pipe()函數(shù) Unix/Linux
io_submit()函數(shù) Unix/Linux
ppoll()函數(shù) Unix/Linux
multiplexer()函數(shù) Unix/Linux
access()函數(shù) Unix/Linux
sched_getparam()函數(shù) Unix/Linux
chown()函數(shù) Unix/Linux
readdir()函數(shù) Unix/Linux
inb_p()函數(shù) Unix/Linux
outsl()函數(shù) Unix/Linux
nanosleep()函數(shù) Unix/Linux
alloc_hugepages()函數(shù) Unix/Linux
sbrk()函數(shù) Unix/Linux
move_pages()函數(shù) Unix/Linux
fchdir()函數(shù) Unix/Linux
renameat()函數(shù) Unix/Linux
getppid()函數(shù) Unix/Linux
getsid()函數(shù) Unix/Linux
oldfstat()函數(shù) Unix/Linux
lseek()函數(shù) Unix/Linux
stat()函數(shù) Unix/Linux
path_resolution()函數(shù) Unix/Linux
getunwind()函數(shù) Unix/Linux
getsockopt()函數(shù) Unix/Linux
mmap2()函數(shù) Unix/Linux
getdents()函數(shù) Unix/Linux
fchownat()函數(shù) Unix/Linux
mkdir()函數(shù) Unix/Linux
perfmonctl()函數(shù) Unix/Linux
open()函數(shù) Unix/Linux
idle()函數(shù) Unix/Linux
poll()函數(shù) Unix/Linux
brk()函數(shù) Unix/Linux
sched_setaffinity()函數(shù) Unix/Linux
mlockall()函數(shù) Unix/Linux

chmod()函數(shù) Unix/Linux

名稱

chmod, fchmod - 更改文件的權(quán)限

內(nèi)容簡介


#include 
#include  

int chmod(const char *path, mode_t mode);
int fchmod(int fildes, mode_t mode); 

描述

給定的文件路徑或引用fildes的的模式改變。

所指定的“或”以下模式:

標(biāo)簽 描述
S_ISUID 04000 set user ID on execution
S_ISGID 02000 set group ID on execution
S_ISVTX 01000 sticky bit
S_IRUSR 00400 read by owner
S_IWUSR 00200 write by owner
S_IXUSR 00100 execute/search by owner
S_IRGRP 00040 read by group
S_IWGRP 00020 write by group
S_IXGRP 00010 execute/search by group
S_IROTH 00004 read by others
S_IWOTH 00002 write by others
S_IXOTH 00001 execute/search by others

The effective UID of the calling process must match the owner of the file, or the process must be privileged (Linux: it must have the CAP_FOWNER capability).

If the calling process is not privileged (Linux: does not have the CAP_FSETIDcapability), and the group of the file does not match the effective group ID of the process or one of its supplementary group IDs, the S_ISGID bit will be turned off, but this will not cause an error to be returned.

As a security measure, depending on the file system, the set-user-ID and set-group-ID execution bits may be turned off if a file is written. (On Linux this occurs if the writing process does not have the CAP_FSETID capability.) On some file systems, only the superuser can set the sticky bit, which may have a special meaning. For the sticky bit, and for set-user-ID and set-group-ID bits on directories, see stat(2).

On NFS file systems, restricting the permissions will immediately influence already open files, because the access control is done on the server, but open files are maintained by the client. Widening the permissions may be delayed for other clients if attribute caching is enabled on them.

返回值

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

錯(cuò)誤

根據(jù)文件系統(tǒng)上的,其他錯(cuò)誤,也可以返回,chmod() 更普遍的錯(cuò)誤列舉如下:

Error Code 描述
EACCES Search permission is denied on a component of the path prefix. (See also path_resolution(2).)
EFAULT path points outside your accessible address space.
EIO An I/O error occurred.
ELOOP Too many symbolic links were encountered in resolving path.
ENAMETOOLONG path is too long.
ENOENT The file does not exist.
ENOMEM Insufficient kernel memory was available.
ENOTDIR A component of the path prefix is not a directory.
EPERM The effective UID does not match the owner of the file, and the process is not privileged (Linux: it does not have theCAP_FOWNER capability).
EROFS The named file resides on a read-only file system.
The general errors for fchmod() are listed below:
EBADF The file descriptor fildes is not valid.
EIO See above.
EPERM See above.
EROFS See above.

遵循于

4.4BSD, SVr4, POSIX.1-2001.

另請參閱