* Can dlsym(RTLD_DEFAULT, "xxx") return the virtual address of an external function in an executable file?
@ 2019-05-07 4:01 yhb
2019-05-07 8:21 ` Florian Weimer
0 siblings, 1 reply; 2+ messages in thread
From: yhb @ 2019-05-07 4:01 UTC (permalink / raw)
To: libc-help
Can dlsym(RTLD_DEFAULT, "xxx") return the virtual address of an external function in an executable file?
I did an experiment, and found out dlsym(RTLD_DEFAULT, "xxx") returned NULL.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Can dlsym(RTLD_DEFAULT, "xxx") return the virtual address of an external function in an executable file?
2019-05-07 4:01 Can dlsym(RTLD_DEFAULT, "xxx") return the virtual address of an external function in an executable file? yhb
@ 2019-05-07 8:21 ` Florian Weimer
0 siblings, 0 replies; 2+ messages in thread
From: Florian Weimer @ 2019-05-07 8:21 UTC (permalink / raw)
To: yhb; +Cc: libc-help
* yhb:
> Can dlsym(RTLD_DEFAULT, "xxx") return the virtual address of an
> external function in an executable file?
It depends on whether the symbol is exported, either explicitly or using
a blanket export with -Wl,-E.
> I did an experiment, and found out dlsym(RTLD_DEFAULT, "xxx") returned NULL.
Does the symbol show up in the .dynsym section, as shown by the command
“readelf -sW”? An occurrence in the .symtab section does not count.
Thanks,
Florian
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2019-05-07 4:01 Can dlsym(RTLD_DEFAULT, "xxx") return the virtual address of an external function in an executable file? yhb
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