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can't create default pager object


From: Ben Asselstine
Subject: can't create default pager object
Date: Sun, 18 Mar 2007 14:06:01 -0400

Hello,

In trying to debug tmpfs I have made a small program to illustrate a
bug I've been experiencing with the default_pager_object interface.

The call to default_pager_object_create returns -308, which apparently
means that the server died (EMIG_SERVER_DIED).

I ran this as a normal user and the permissions on
/servers/default-pager are wide open.  I get the same error when
running as root.

I would appreciate some feedback on this issue, or some pointers about
how I can debug this.

Here's the test program:
v+
#include <hurd.h>
#include <fcntl.h>
#include <hurd/paths.h>
#include <error.h>
#include "default_pager_U.h"
int
main (int argc, char **argv)
{
 size_t allocsize = 1024;
 mach_port_t memobj = MACH_PORT_NULL;

 default_pager = file_name_lookup (_SERVERS_DEFPAGER, O_EXEC, 0);
 if (default_pager == MACH_PORT_NULL)
   error (0, errno, _SERVERS_DEFPAGER);

 error_t err = default_pager_object_create (default_pager, &memobj, allocsize);
 mach_port_deallocate (mach_task_self (), default_pager);
 if (err == 0)
   {
     error (0, 0, "success!!");
     mach_port_deallocate (mach_task_self (), memobj);
   }
 else
   error (0, errno, "can't create object of %d bytes: err is %d",
          allocsize, err);

 return err;
}
v-

I built it with this Makefile:
v+
HURDSRC = /devel4/bing/hurd
CFLAGS  = -D_GNU_SOURCE -Wall -g -I$(HURDSRC)
SRC     = default_pagerUser.c pdex.c
OBJ     = $(SRC:%.c=%.o)
PROGRAM = pdex
all: $(PROGRAM)

default_pagerUser.c default_pager_U.h: /include/hurd/default_pager.defs
       mig -s -user default_pagerUser.c /include/hurd/default_pager.defs\
           -server /dev/null -header default_pager_U.h

$(PROGRAM): $(OBJ)
       gcc -o $@ $^

clean:
       rm -f $(PROGRAM) $(OBJ) default_pagerUser.c default_pager_U.h

v-

Please excuse the lack of tabs.

regards,

Ben




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