ref: 74d91a0021de012908cfdb35fb61a1473a376130
dir: /lib/bio/fd.myr/
use std
use "bio"
use "types"
pkg bio =
const mkfile : (fd : std.fd, mode : mode -> file#)
const open : (path : byte[:], mode : mode -> std.result(file#, byte[:]))
const dial : (srv : byte[:], mode : mode -> std.result(file#, byte[:]))
const create : (path : byte[:], mode : mode, perm : int -> std.result(file#, byte[:]))
;;
const mkfile = {fd, mode
-> mk(mode, [
.read = {buf; -> std.read(fd, buf)},
.write = {buf; -> std.write(fd, buf)},
.seek = {off; -> std.seek(fd, off, std.Seekset)},
.close = {; -> std.close(fd) >= 0},
])
}
/* Opens a file with mode provided. */
const open = {path, mode
-> sysopen(path, mode, sysmode(mode), 0o777)
}
/*
Creates a file for the provided path, with opened in
the requested mode, with the requested permissions
*/
const create = {path, mode, perm
-> sysopen(path, mode, sysmode(mode) | std.Ocreat | std.Otrunc, perm)
}
/* dial the server, and open a file using the returned fd */
const dial = {srv, mode
match std.dial(srv)
| `std.Ok sock: -> `std.Ok mkfile(sock, mode)
| `std.Err m: -> `std.Err m
;;
}
/* map from the bio modes to the unix open modes */
const sysmode = {mode
match mode
| Rd: -> std.Oread
| Wr: -> std.Owrite
| Rw: -> std.Ordwr
| _: std.fatal("bio: bad file mode")
;;
-> 0
}
/* open the file, and return it */
const sysopen = {path, mode, openmode, perm
match std.openmode(path, openmode, (perm : int64))
| `std.Ok fd: -> `std.Ok mkfile(fd, mode)
| `std.Err e: -> `std.Err "could not open fd"
;;
}