/proc/pid/maps Post: 302573985

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Top Forums UNIX for Dummies Questions & Answers /proc/pid/maps Post 302573985 by ygemici on Wednesday 16th of November 2011 08:12:09 AM

11-16-2011

Registered User

Quote:

Originally Posted by vistastar

But why the shared part of shared library don't show in the maps like

Code:

b73a7000-b73ae000 r--s 00000000 08:08 12004      /usr/lib/gconv/gconv-modules.cache

shared libraries are mapped with MAP_PRIVATE flag (points the 'p') for only visible from the process which calls to mmap() not other process that mapping the same file.
if any changes are needed on the shared library, then changes just affect the memory mapped region of this process by the get a copy of this page and read/write on that.
so other process are not affected for any changes.

eventually these files are mapping with 'private' type for probably despite the case of file corruption.nevertheless after the any made changes (on the copy page), modified/changed pages can use for share between processes with MAP_SHARED flag.(as the `parent-child` processes..)

gconv-modules.cache is cache data (i.e..recently libraries..) file for speedup the loading executables that provided by glibc, therefore cache datas must use as writable for any applications.because, these are mapped with MAP_SHARED (points the 's').and so last changes are visible by the other processes.

regards
ygemici

ygemici

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LEARN ABOUT OPENSOLARIS

libdl

libdl(3LIB)							Interface Libraries						       libdl(3LIB)

NAME

       libdl - dynamic linking library

SYNOPSIS

       cc [ flag... ] file... -ldl [ library... ]

DESCRIPTION

       Historically, functions in libdl provided for dynamic linking support. This functionality now resides in libc(3LIB).

       This  library  is  maintained  to provide backward compatibility for both runtime and compilation environments. The shared object is imple-
       mented as a filter on the runtime linker. See ld.so.1(1). New application development need not specify -ldl.

INTERFACES

       The shared object libdl.so.1 provides the following public interfaces. See Intro(3) for additional information on shared object interfaces.

       dladdr			     dladdr1
       dlclose			     dldump
       dlerror			     dlinfo
       dlmopen			     dlopen
       dlsym

FILES

       /lib/libdl.so.1	     shared object

       /lib/64/libdl.so.1    64-bit shared object

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsl (32-bit)		   |
       +-----------------------------+-----------------------------+
       |			     |SUNWcslx (64-bit) 	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ld.so.1(1), pvs(1), Intro(3), libc(3LIB), attributes(5)

SunOS 5.11							    24 Mar 2004 						       libdl(3LIB)