Roland Mainz wrote:
> Ok...
> ... is it possible to make "elfwrap" tag the data as "shareable between
> processes" (e.g. read-only) by default ? Otherwise we have a similar
> issue like the current Sun Studio 10/11 "cc" behaviour for string
> literals which eat memory per process instead of being shared between
> processes (unless you use "-xstrconst") ...
It is read-only. For example, from a standard ELF relocatable object:
Section Header[4]: sh_name: .rodata
sh_addr: 0 sh_flags: [ SHF_ALLOC ]
sh_size: 0 sh_type: [ SHT_PROGBITS ]
Section Header[5]: sh_name: .data
sh_addr: 0 sh_flags: [ SHF_WRITE SHF_ALLOC ]
sh_size: 0 sh_type: [ SHT_PROGBITS ]
The .rodata (read-only data) section only has SHF_ALLOC flag set. The
.data section is writable (and non-sharable) having the SHF_WRITE flag set.
elfwrap(1) produces:
Section Header[1]: sh_name: .passwd
sh_addr: 0 sh_flags: [ SHF_ALLOC ]
sh_size: 0x395 sh_type: [ SHT_PROGBITS ]
All allocatable, non-writable sections are combined by ld(1) into the
text segment, which is read-only and sharable between all processes.
--
Rod.
