```sh
$ git clone git://sourceware.org/git/glibc
$ cd glibc
$ ls
advisories io socket COPYINGv3
argp libio soft-fp extra-lib.mk
assert locale stdio-common gen-locales.mk
benchtests localedata stdlib INSTALL
bits login string libc-abis
catgets mach sunrpc libof-iterator.mk
ChangeLog.old malloc support LICENSES
conform manual sysdeps MAINTAINERS
csu math sysvipc Makeconfig
ctype mathvec termios Makefile
debug misc time Makefile.help
dirent nis timezone Makefile.in
dlfcn nptl wcsmbs Makerules
elf nptl_db wctype NEWS
gmon nscd abi-tags o-iterator.mk
gnulib nss aclocal.m4 README
hesiod po config.h.in Rules
htl posix config.make.in SECURITY.md
hurd resolv configure SHARED-FILES
iconv resource configure.ac shlib-versions
iconvdata rt CONTRIBUTED-BY test-skeleton.c
include scripts COPYING.LESSERv2 version.h
inet setjmp COPYING.LIB
intl signal COPYINGv2
$ $ find . | grep -i syscall | head -n 20
./include/syscall.h
./mach/syscalls.awk
./sysdeps/mach/sys/syscall.h
./sysdeps/mach/i386/syscall.S
./sysdeps/unix/make-syscalls.sh
./sysdeps/unix/sysv/linux/arm/libc-do-syscall.S
./sysdeps/unix/sysv/linux/arm/syscall_cancel.S
./sysdeps/unix/sysv/linux/arm/syscall.S
./sysdeps/unix/sysv/linux/arm/syscalls.list
./sysdeps/unix/sysv/linux/arm/arch-syscall.h
./sysdeps/unix/sysv/linux/m68k/syscall_cancel.S
./sysdeps/unix/sysv/linux/m68k/syscall.S
./sysdeps/unix/sysv/linux/m68k/syscalls.list
./sysdeps/unix/sysv/linux/m68k/arch-syscall.h
./sysdeps/unix/sysv/linux/or1k/syscall_cancel.S
./sysdeps/unix/sysv/linux/or1k/arch-syscall.h
./sysdeps/unix/sysv/linux/sh/syscall_cancel.S
./sysdeps/unix/sysv/linux/sh/syscall.S
./sysdeps/unix/sysv/linux/sh/syscalls.list
./sysdeps/unix/sysv/linux/sh/arch-syscall.h
$ find . | grep -i syscall | grep x86_64/64
./sysdeps/unix/sysv/linux/x86_64/64/arch-syscall.h
$ file=$(find . | grep -i syscall | grep x86_64/64)
$ head $file
/* AUTOGENERATED by update-syscall-lists.py. */
#define __NR__sysctl 156
#define __NR_accept 43
#define __NR_accept4 288
#define __NR_access 21
#define __NR_acct 163
#define __NR_add_key 248
#define __NR_adjtimex 159
#define __NR_afs_syscall 183
#define __NR_alarm 37
$ sort -n -k 3 $file
/* AUTOGENERATED by update-syscall-lists.py. */
#define __NR_read 0
#define __NR_write 1
#define __NR_open 2
#define __NR_close 3
#define __NR_stat 4
#define __NR_fstat 5
#define __NR_lstat 6
#define __NR_poll 7
#define __NR_lseek 8
#define __NR_mmap 9
#define __NR_mprotect 10
#define __NR_munmap 11
...
$ sort -n -k 3 $file > syscalls
$ exit
```