SRV(3) SRV(3)
NAME
srv - server registry
SYNOPSIS
bind #s [ spec ] /chan
sys->bind("#sspec", "/chan", Sys->MREPL);
DESCRIPTION
Srv converts between file system operations by applications
and messages on channels, as described in sys-file2chan(2).
Each attach that does not include a spec produces a new
instance: an empty directory owned by the current user in
which only files may be created, and then only by sys-
file2chan, using a special internal interface. Each such
file initially has the same owner as the directory, and per-
missions 8r600 (read-write for the owner only), but the per-
missions can be changed by Sys->wstat (see sys-stat(2)) and
thus chmod(1). If mode Sys->DMEXCL is thereby set, the file
becomes exclusive-use and can be opened by only one process
at a time. The file length and mode bit Sys->DMAPPEND may
also be set by wstat but are not interpreted by the system.
Files may be removed, directly using sys-remove(2) (and thus
rm(1)), or indirectly by opening them with mode Sys->ORCLOSE
(see sys-open(2)). File2chan also removes the corresponding
file when the last references to the server's read and write
channels have gone (eg, on server exit).
A spec may be given to name specific instances of srv, so
that a new name space can bind in a service created in
another. Only the owner (original creator) of the instance
may attach to it, unless the mode of the service directory
is changed using Sys->wstat (see sys-stat(2)) to have gen-
eral access.
FILES
/chan directory to which srv is conventionally bound by
various applications
SOURCE
/emu/port/devsrv.c
/os/port/devsrv.c
SEE ALSO
plumb(1), wm(1), sys-file2chan(2)
BUGS
A client with a read or write pending can remain blocked if
the server exits before reply.
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