41 lines
1.5 KiB
C
41 lines
1.5 KiB
C
#define _FILE_OFFSET_BITS 64
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <resolv.h>
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int main() {
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/* in glibc 2.28+ and _FILE_OFFSET_BITS=64 fcntl is #define'd to fcntl64
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* Thus headers say `fcntl64` exists, but libc.so.6 (the old one)
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* disagrees, resulting in a linking error unless headers are made
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* backwards-compatible.
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*
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* Glibc 2.28+:
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* FUNC GLOBAL DEFAULT UND fcntl64@GLIBC_2.28 (3):
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*
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* Glibc 2.27 or older:
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* FUNC GLOBAL DEFAULT UND fcntl@GLIBC_2.2.5
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*/
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printf("address to fcntl: %p\n", fcntl);
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/* The following functions became symbols of their own right with glibc
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* 2.34+. Before 2.34 resolv.h would #define res_search __res_search; and
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* __res_search is a valid symbol since the beginning of time.
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*
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* On glibc 2.34+ these symbols are linked this way:
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* FUNC GLOBAL DEFAULT UND res_search@GLIBC_2.34 (2)
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*
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* Pre-glibc 2.34:
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* FUNC GLOBAL DEFAULT UND __res_search@GLIBC_2.2.5 (4)
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*/
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printf("address to res_search: %p\n", res_search);
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printf("address to res_nsearch: %p\n", res_nsearch);
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printf("address to res_query: %p\n", res_query);
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printf("address to res_nquery: %p\n", res_nquery);
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printf("address to res_querydomain: %p\n", res_querydomain);
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printf("address to res_nquerydomain: %p\n", res_nquerydomain);
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printf("address to dn_skipname: %p\n", dn_skipname);
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printf("address to dn_comp: %p\n", dn_comp);
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printf("address to dn_expand: %p\n", dn_expand);
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}
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