OCaml, default value for Unix.umask -


consider code :

#load "unix.cma" ;; print_int (unix.umask 0) ;; print_newline () ;;

when run it, 2 (binary : 000.000.010). when run 'sudo', 18 (binary : 000.010.010) expected 0o640 (binary : 110.010.000), standard library says : http://caml.inria.fr/pub/docs/manual-ocaml/libref/unix.html#typefile_perm purpose make directory. if make 

(unix.umask 0) lor (0o640)

it created inaccessible. accurate @ binary numbers gives me idea default mask reverted. so, make directory using :

let revert_mask m =   let user  = (m land 0b000000111) in   let group = (m land 0b000111000) lsr 3 in   let other = (m land 0b111000000) lsr 6 in   (user lsl 6) lor (group lsl 3) lor other ;;

then, create directory :

let mask = (revert_mask (unix.umask 0)) lor 0o640 ;; print_int mask ;; print_newline () ;; unix.mkdir "foo" mask ;;

i 416 (0o640), corresponds 

ls -l | grep foo

:

drw-r----- 2 (me) (me) 4096 june   2 19:23 foo

however, a

cd foo

won't work.

so, i'm stuck ubuntu 14.04 , ocaml 4.01.0 toplevel.

the documentation linked says:

type file_perm = int
type of file access rights, e.g. 0o640 read , write user, read group, none others

the 0o640 example, not expected default value -- , it's example file_perm value, not example umask value.

i'm not familiar ocaml, in unix in general umask attribute of each process, typically set default value modifiable calling umask system call.

the bits of umask turned off when creating file or directory. example, current umask 0022 (or, in ocaml syntax, 0o022) -- means when create file or directory, corresponding bits (write access group , others) turned off. directories need execute permission, , files don't, if create directory default permissions 755 (rwxr-xr-x), , if create file default permissions 644 (rw-r--r--).

0o640 not sensible umask value.


Comments

Post a Comment

Popular posts from this blog

commonjs - How to write a typescript definition file for a node module that exports a function? -

consider, toml node module can use: // toml.d.ts declare module toml { export function parse(value:string):any; } declare module "toml" { export = toml; } then: /// <reference path="../../../../../defs/toml/toml.d.ts"/> import toml = require('toml'); toml.parse(...); however, node module export single function, such 'glob' ( https://github.com/isaacs/node-glob ). the node usage of module be: var glob = require("glob") glob("*.js", {}, callback(err, files) { ... }); you'd naively expect this: // glob.d.ts declare function globs(paths:string, options:any, callback:{(err:any, files:string[]):void; ...but because typescripts 'import' semantics bit strange, seems can use 'import .. = require()' statement alias modules . trying call: /// <reference path="../../../../../defs/glob/glob.d.ts"/> import blog = require('glob'); results in: error ts2072: mod...
Read more

openid - Okta: Failed to get authorization code through API call -

i'm integrating okta own idp server using okta's api. i'm implementing authorization code flow following steps below: in own server, use /api/v1/authn endpoint sessiontoken. use sessiontoken obtain authorization calling endpoint: /oauth2/v1/authorize?client_id=" + clientid + "&sessiontoken=" + sessiontoken + "&response_type=code&response_mode=query&scope=openid&redirect_uri=" + redirecturl + "&state=evanyang&nonce=" it's supposed return response status code 302 , location header containing redirect url code value. however, keep getting response status code 200 , without location header, html body saying "you using unsupported browser." , "javascript disabled on browser." according api documentation: http://developer.okta.com/docs/api/resources/oidc.html#authentication-request , sessiontoken parameter sufficient this: an okta one-time sessiontoken. allows api-based ...
Read more

ios - Change Storyboard View using Seague -

i have following code checks connection server, , depending on want change views if no connection found. nsstring *connect = [nsstring stringwithcontentsofurl:[nsurl urlwithstring:@"http://myserver.com"] encoding:nsutf8stringencoding error:nil]; if (connect == null) { [self performseguewithidentifier:@"network_failure" sender:self]; } else { // other code here } my problem not change views. have added storyboard segue between 2 views identifier of network_failure . not have navigation controller or that, problem? thanks help! no not problem. first of all, in objectivec exists nil object oriented null . must use that. so: if(connect == nil) or better: if(!connect) so due fact nil not same of null , probably code does't enter in if scope . you have been able discover breakpoint. anyway: be sure set trigger segue (line) 2 view controller , , name network_failure (that not best name. should instead view1toview2 ) as, m...
Read more