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.