X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/55e303ae13a4cf49d70f2294092726f2fffb9ef2..4bd07ac2140668789aa3ee8ec4dde4a3e0a3bba5:/bsd/man/man2/chmod.2?ds=sidebyside diff --git a/bsd/man/man2/chmod.2 b/bsd/man/man2/chmod.2 index bc34d2417..b49c28075 100644 --- a/bsd/man/man2/chmod.2 +++ b/bsd/man/man2/chmod.2 @@ -38,15 +38,24 @@ .Os BSD 4 .Sh NAME .Nm chmod , -.Nm fchmod +.Nm fchmod , +.Nm fchmodat .Nd change mode of file .Sh SYNOPSIS .Fd #include .Fd #include .Ft int -.Fn chmod "const char *path" "mode_t mode" +.Fo chmod +.Fa "const char *path" +.Fa "mode_t mode" +.Fc .Ft int -.Fn fchmod "int fd" "mode_t mode" +.Fo fchmod +.Fa "int fildes" +.Fa "mode_t mode" +.Fc +.Ft int +.Fn fchmodat "int fd" "const char *path" "mode_t mode" "int flag" .Sh DESCRIPTION The function .Fn chmod @@ -56,18 +65,53 @@ specified by the pathname .Fa path to .Fa mode . -.Fn Fchmod +.Fn fchmod sets the permission bits of the specified file descriptor -.Fa fd . -.Fn Chmod +.Fa fildes . +.Fn chmod verifies that the process owner (user) either owns the file specified by .Fa path (or -.Fa fd ) , +.Fa fildes ) , or is the super-user. +.Pp +The +.Fn fchmodat +is equivalent to +.Fn chmod +except in the case where +.Fa path +specifies a relative path. +In this case the file to be changed is determined relative to the directory +associated with the file descriptor +.Fa fd +instead of the current working directory. +The values for the +.Fa flag +are constructed by a bitwise-inclusive OR of flags from the following list, defined +in +.In fcntl.h : +.Bl -tag -width indent +.It Dv AT_SYMLINK_NOFOLLOW +If +.Fa path +names a symbolic link, then the mode of the symbolic link is changed. +.El +.Pp +If +.Fn fchmodat +is passed the special value +.Dv AT_FDCWD +in the +.Fa fd +parameter, the current working directory is used. +If also +.Fa flag +is zero, the behavior is identical to a call to +.Fn chmod . A mode is created from .Em or'd permission bit masks @@ -126,62 +170,134 @@ Otherwise, a value of -1 is returned and .Va errno is set to indicate the error. .Sh ERRORS -.Fn Chmod -will fail and the file mode will be unchanged if: +The +.Fn chmod +system call will fail and the file mode will be unchanged if: .Bl -tag -width Er -.It Bq Er ENOTDIR -A component of the path prefix is not a directory. +.\" ========== +.It Bq Er EACCES +Search permission is denied for a component of the path prefix. +.\" ========== +.It Bq Er EFAULT +.Fa Path +points outside the process's allocated address space. +.\" ========== +.It Bq Er EINTR +Its execution was interrupted by a signal. +.\" ========== +.It Bq Er EIO +An I/O error occurred while reading from or writing to the file system. +.\" ========== +.It Bq Er ELOOP +Too many symbolic links were encountered in translating the pathname. +This is taken to be indicative of a looping symbolic link. +.\" ========== .It Bq Er ENAMETOOLONG A component of a pathname exceeded .Dv {NAME_MAX} characters, or an entire path name exceeded .Dv {PATH_MAX} characters. +.\" ========== .It Bq Er ENOENT The named file does not exist. -.It Bq Er EACCES -Search permission is denied for a component of the path prefix. -.It Bq Er ELOOP -Too many symbolic links were encountered in translating the pathname. +.\" ========== +.It Bq Er ENOTDIR +A component of the path prefix is not a directory. +.\" ========== .It Bq Er EPERM The effective user ID does not match the owner of the file and the effective user ID is not the super-user. +.\" ========== .It Bq Er EROFS The named file resides on a read-only file system. -.It Bq Er EFAULT -.Fa Path -points outside the process's allocated address space. -.It Bq Er EIO -An I/O error occurred while reading from or writing to the file system. .El .Pp -.Fn Fchmod +.Fn fchmod will fail if: .Bl -tag -width Er +.\" ========== .It Bq Er EBADF -The descriptor is not valid. +.Fa fildes +is not a valid file descriptor. +.\" ========== .It Bq Er EINVAL -.Fa fd +.Fa fildes refers to a socket, not to a file. -.It Bq Er EROFS -The file resides on a read-only file system. +.\" ========== +.It Bq Er EINVAL +.Fa mode +is not a valid file mode. +.\" ========== +.It Bq Er EINTR +Its execution was interrupted by a signal. +.\" ========== .It Bq Er EIO An I/O error occurred while reading from or writing to the file system. +.\" ========== +.It Bq Er EPERM +The effective user ID does not match the owner of the file and +the effective user ID is not the super-user. +.\" ========== +.It Bq Er EROFS +The file resides on a read-only file system. .El +.Pp +In addition to the +.Fn chmod +errors, +.Fn fchmodat +fails if: +.Bl -tag -width Er +.It Bq Er EBADF +The +.Fa path +argument does not specify an absolute path and the +.Fa fd +argument is neither +.Fa AT_FDCWD +nor a valid file descriptor open for searching. +.It Bq Er EINVAL +The value of the +.Fa flag +argument is not valid. +.It Bq Er ENOTDIR +The +.Fa path +argument is not an absolute path and +.Fa fd +is neither +.Dv AT_FDCWD +nor a file descriptor associated with a directory. +.El +.Sh LEGACY SYNOPSIS +.Fd #include +.Fd #include +.Pp +The include file +.In sys/types.h +is necessary. .Sh SEE ALSO .Xr chmod 1 , -.Xr open 2 , .Xr chown 2 , +.Xr open 2 , .Xr stat 2 , +.Xr compat 5 , .Xr sticky 8 .Sh STANDARDS The .Fn chmod function is expected to conform to .St -p1003.1-88 . +The +.Fn fchmodat +function is expected to conform to POSIX.1-2008 . .Sh HISTORY The .Fn fchmod function call appeared in .Bx 4.2 . +The +.Fn fchmodat +system call appeared in OS X 10.10