How to export a symbol to a shared library in nasm?

I have the following:

BITS 64__NR_getuid equ 102global sys_getuidsection .textsys_getuid:    xor eax, eax    mov al, __NR_getuid    syscall    ret

This is compiled with:

nasm -f elf64 -o getuid.o getuid.asmld -shared -o libgetuid.so getuid.o

However sys_getuid isn't exported. Witness:

#include <stdio.h>extern int sys_getuid();int main(){    printf("UID = %d\n", sys_getuid());    return 0;}

gcc -o junk -L. -lgetuid junk.c/usr/bin/ld: /tmp/ccHOc4iR.o: in function `main':junk.c:(.text+0xa): undefined reference to `sys_getuid'collect2: error: ld returned 1 exit status

How do I export the symbol?

I clearly don't need any relocation information for this library, so I should be able to do this like so.