Hi all, Does anyone know how to control the address space layout of a dynamically linked program in linux? Alternatively, are dynamically linked libraries always going to be in the same place?
E.g: When compling a simple hello world program, and running it I end up with a memory map like so: cat /proc/1234/maps 08048000-08049000 r-xp 00000000 08:03 33938996 /home/benno/tmp/work/a.out 08049000-0804a000 rw-p 00000000 08:03 33938996 /home/benno/tmp/work/a.out b7e91000-b7e92000 rw-p b7e91000 00:00 0 b7e92000-b7e9e000 r-xp 00000000 08:03 117442181 /lib/tls/libpthread-0.60.so b7e9e000-b7e9f000 rw-p 0000c000 08:03 117442181 /lib/tls/libpthread-0.60.so b7e9f000-b7ea1000 rw-p b7e9f000 00:00 0 b7ea1000-b7fca000 r-xp 00000000 08:03 117442168 /lib/tls/libc-2.3.2.so b7fca000-b7fd2000 rw-p 00129000 08:03 117442168 /lib/tls/libc-2.3.2.so b7fd2000-b7fd6000 rw-p b7fd2000 00:00 0 b7fd6000-b7fdb000 r-xp 00000000 08:03 117442183 /lib/tls/librt-2.3.2.so b7fdb000-b7fdc000 rw-p 00005000 08:03 117442183 /lib/tls/librt-2.3.2.so b7fe8000-b7fea000 rw-p b7fe8000 00:00 0 b7fea000-b8000000 r-xp 00000000 08:03 67136311 /lib/ld-2.3.2.so b8000000-b8001000 rw-p 00015000 08:03 67136311 /lib/ld-2.3.2.so bfffe000-c0000000 rw-p bfffe000 00:00 0 ffffe000-fffff000 ---p 00000000 00:00 0 The same program linked statically gives: 08048000-080ad000 r-xp 00000000 08:03 33938996 /home/benno/tmp/work/a.out 080ad000-080af000 rw-p 00064000 08:03 33938996 /home/benno/tmp/work/a.out 080af000-080d1000 rw-p 080af000 00:00 0 b7fff000-b8000000 rw-p b7fff000 00:00 0 bffff000-c0000000 rw-p bffff000 00:00 0 ffffe000-fffff000 ---p 00000000 00:00 0 It would be convenient for my current project if there was some way to specify where in VM the dynamic libraries ended up. Along the same line, is there a way to control the location of stack and heap? (I'm not at all certain that this can actually be done, and I'll probably have to use a staticly linked library.) Cheers, Benno -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
