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PROTO(2)                      System Calls Manual                     PROTO(2)



NAME
       rdproto - parse and process a proto file listing

SYNOPSIS
       #include <u.h>
       #include <libc.h>
       #include <disk.h>

       typedef void Protoenum(char *new, char *old, Dir *d, void *a)

       typedef void Protowarn(char *msg, void *a)

       int rdproto(char *proto, char *root, Protoenum *enm,
                                Protowarn *warn, void *a)

DESCRIPTION
       Rdproto  reads and interprets the named proto file relative to the root
       directory root.

       Each line of the proto file specifies a file to copy.  Blank lines  and
       lines beginning with # are ignored.  Indentation (usually tabs) is sig‐
       nificant, with each level of indentation corresponding to  a  level  in
       the file tree.  Fields within a line are separated by white space.  The
       first field is the last path element in the destination file tree.  The
       second  field  specifies the permissions.  The third field is the owner
       of the file, and the fourth is the group owning the  file.   The  fifth
       field  is  the  name  of the file from which to copy; this file is read
       from the current name space, not the  source  file  tree.   All  fields
       except the first are optional.  Specifying - for permissions, owner, or
       group causes rdproto to fetch the corresponding  information  from  the
       file  rather  than override it.  (This is the default behavior when the
       fields are not present; explicitly specifying  -  is  useful  when  one
       wishes to set, say, the file owner without setting the permissions.)

       Names  beginning  with a are expanded as environment variables.  If the
       first file specified in a directory is all of the files in that  direc‐
       tory  are considered listed.  If the first file is all of the files are
       copied, and all subdirectories are recursively considered listed.   All
       files are considered relative to root.

       For  each  file  named by the proto, enm is called with new pointing at
       the name of the file (without the root prefix),  old  pointing  at  the
       name  of  the  source file (with the root prefix, when applicable), and
       Dir at the desired directory information for the new  file.   Only  the
       name,  uid,  gid,  mode,  mtime, and length fields are guaranteed to be
       valid.  The argument a is the same argument passed  to  rdproto;  typi‐
       cally it points at some extra state used by the enumeration function.

       When files or directories do not exist or cannot be read by rdproto, it
       formats a warning message, calls warn,  and  continues  processing;  if
       warn is nil, rdproto prints the warning message to standard error.

       Rdproto  returns  zero  if  proto  was processed, -1 if it could not be
       opened.

FILES
       /sys/lib/sysconfig/proto/
              directory of prototype files.

       /sys/lib/sysconfig/proto/portproto
              generic prototype file.

SOURCE
       /sys/src/libdisk/proto.c

SEE ALSO
       mk9660(8), mkfs(8)



                                                                      PROTO(2)