What are __NR_(socket,connect et all) symbols refering too in GLIBC?

[Alex Bennee <alex at braddahead dot com>]

Having built my bootstrap gcc and going through the process of building
the beast that is glibc I finally come to a linker error complaining
about some __NR_(socket function) symbols:

 /home/alex/src/src/glibc/../../host/sh4-linux/bin/gcc -nostdlib
-nostartfiles -o
/home/alex/src/src/glibc/glibc-2.2.4/objdir/iconv/iconvconfig 
-Wl,-dynamic-linker=/home/alex/src/src/glibc/../../target//lib/ld-linux.so.2    /home/alex/src/src/glibc/glibc-2.2.4/objdir/csu/crt1.o /home/alex/src/src/glibc/glibc-2.2.4/objdir/csu/crti.o `/home/alex/src/src/glibc/../../host/sh4-linux/bin/gcc --print-file-name=crtbegin.o` /home/alex/src/src/glibc/glibc-2.2.4/objdir/iconv/iconvconfig.o /home/alex/src/src/glibc/glibc-2.2.4/objdir/iconv/strtab.o /home/alex/src/src/glibc/glibc-2.2.4/objdir/iconv/xmalloc.o  -Wl,-rpath-link=/home/alex/src/src/glibc/glibc-2.2.4/objdir:/home/alex/src/src/glibc/glibc-2.2.4/objdir/math:/home/alex/src/src/glibc/glibc-2.2.4/objdir/elf:/home/alex/src/src/glibc/glibc-2.2.4/objdir/dlfcn:/home/alex/src/src/glibc/glibc-2.2.4/objdir/nss:/home/alex/src/src/glibc/glibc-2.2.4/objdir/nis:/home/alex/src/src/glibc/glibc-2.2.4/objdir/rt:/home/alex/src/src/glibc/glibc-2.2.4/objdir/resolv:/home/alex/src/src/glibc/glibc-2.2.4/objdir/crypt:/home/alex/src/src/glibc/glibc-2.2.4/objdir/linuxthreads /home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6 /home/alex/src/src/glibc/glibc-2.2.4/objdir/libc_nonshared.a -lgcc `/home/alex/src/src/glibc/../../host/sh4-linux/bin/gcc --print-file-name=crtend.o` /home/alex/src/src/glibc/glibc-2.2.4/objdir/csu/crtn.o
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_connect'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_shutdown'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_recvfrom'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_getsockopt'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_setsockopt'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_send'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_socket'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_accept'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_recv'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_recvmsg'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_sendto'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_listen'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_getpeername'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_socketpair'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_getsockname'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_sendmsg'
/home/alex/src/src/glibc/glibc-2.2.4/objdir/libc.so.6: undefined
reference to `__NR_bind'
collect2: ld returned 1 exit status

However when I do a search though the code I can't find any references
to these functions in the code, only in the object files. For example;

[alex@cambridge objdir]$ sh4-linux-objdump -x socket/connect.o

socket/connect.o:     file format elf32-sh-linux
socket/connect.o
architecture: sh3, flags 0x00000011:
HAS_RELOC, HAS_SYMS
start address 0x00000000

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00000040  00000000  00000000  00000040  2**5
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
  1 .data         00000000  00000000  00000000  00000080  2**0
                  CONTENTS, ALLOC, LOAD, DATA
  2 .bss          00000000  00000000  00000000  00000080  2**0
                  ALLOC
SYMBOL TABLE:
00000000 l    df *ABS*	00000000
/home/alex/st40/src/linux-2.4.17_st1.2/include/asm/errno.h
00000000 l    df *ABS*	00000000
/home/alex/st40/src/linux-2.4.17_st1.2/include/asm/unistd.h
00000000 l    df *ABS*	00000000
/home/alex/src/src/glibc/glibc-2.2.4/objdir/config.h
00000000 l    d  .text	00000000 
00000000 l    d  .data	00000000 
00000000 l    d  .bss	00000000 
00000000 l       *ABS*	00000000 *ABS*
00000000 g     F .text	00000040 __libc_connect
00000000         *UND*	00000000 __NR_connect
00000000         *UND*	00000000 __syscall_error
00000000  w    F .text	00000040 connect
00000000  w    F .text	00000040 __connect


RELOCATION RECORDS FOR [.text]:
OFFSET   TYPE              VALUE 
00000008 R_SH_DIR32        __NR_connect
0000003c R_SH_DIR32        __syscall_error

What are these symbols meant to be referring too?

-- 
Alex Bennee
Senior Hacker, Braddahead Ltd
The above is probably my personal opinion and may not be that of my
employer


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