say goodbye to clients then close socket

main.s

@@ -3,10 +3,12 @@ global _start
 ; constants
 SYS_READ        equ 0
 SYS_WRITE       equ 1
+SYS_CLOSE       equ 3
 SYS_POLL        equ 7
 SYS_SENDFILE    equ 40
 SYS_SOCKET      equ 41
 SYS_ACCEPT      equ 43
+SYS_SHUTDOWN    equ 48
 SYS_BIND        equ 49
 SYS_LISTEN      equ 50
 SYS_EXIT        equ 60
@@ -20,6 +22,7 @@ F_SETFL         equ 4
 O_NONBLOCK      equ 2048
 POLLIN          equ 1
 POLLOUT         equ 4
+SHUT_RDWR       equ 2
 
 pollfd_size equ 4 + 2 + 2  ; $ man 2 poll
 pollfds_capacity equ 100
@@ -28,6 +31,8 @@ SECTION .data
 server_path     db "server.sock", 0x00
 server_path_len equ $ - server_path
 sockaddr_size   equ 2 + 108  ; $ man 7 unix
+goodbye         db "goodbye", 0x0a
+goodbye_len     equ $ - goodbye
 
 SECTION .bss
 sockaddr        resb sockaddr_size
@@ -36,8 +41,11 @@ pollfds_len     resb 8
 
 SECTION .text
 
+return:
+    ret
+
 %include "server.s"
-;%include "pollfds_remove.s"
+%include "pollfds_remove.s"
 
 _start:
     call make_server
@@ -71,17 +79,44 @@ pollfds__scan__loop:
     jmp pollfds__scan__loop
 
 pollfds__scan__found:
+    mov r14, 0
     mov r14d, [pollfds + r15 * pollfd_size]
     cmp r14d, edi
     je pollfds__scan__found__server
 
 pollfds__scan__found__client:
-    jmp exit
+    push rdi
+
+    mov rax, SYS_WRITE
+    mov rdi, 0
+    mov edi, r14d
+    mov rsi, goodbye
+    mov rdx, goodbye_len
+    syscall
+    cmp rax, 0
+    jl exit
+
+    mov rax, SYS_SHUTDOWN
+    mov rdi, 0
+    mov edi, r14d
+    mov rsi, SHUT_RDWR
+    syscall
+
+    mov rax, SYS_CLOSE
+    mov rdi, 0
+    mov edi, r14d
+    syscall
+
+    mov rdi, r14
+    call pollfds__remove
+
+    pop rdi
     jmp pollfds__scan__loop
 
 pollfds__scan__found__server:
-    mov rax, SYS_ACCEPT
     push rdi
+
+    mov rax, SYS_ACCEPT
     mov rsi, 0
     mov rdx, 0
     syscall
@@ -106,9 +141,6 @@ pollfds__append:
     mov [pollfds_len], r10
     ret
 
-return:
-    ret
-
 exit:
     mov rax, SYS_EXIT
     mov rdi, 0