loop pollfds: only checking server for now

main.s

@@ -32,92 +32,83 @@ sockaddr_size   equ 2 + 108  ; $ man 7 unix
 SECTION .bss
 sockaddr        resb sockaddr_size
 pollfds         resb pollfd_size * pollfds_capacity
+pollfds_len     resb 8
 
 SECTION .text
 
 %include "server.s"
+;%include "pollfds_remove.s"
 
 _start:
     call make_server
-    mov rbx, 0  ; pollfd array length
-    mov ebp, eax  ; server fd
-
-    mov rax, rbx
-    mov edi, ebp
-    mov si, POLLIN
+    mov rbx, rax  ; server fd
+    mov rdi, rax
+    mov rsi, POLLIN
     call pollfds__append
-    mov rbx, rax
 
 poll:
     mov rax, SYS_POLL
     mov rdi, pollfds
-    mov rsi, rbx
+    mov rsi, [pollfds_len]
     mov rdx, 5000
     syscall
     cmp rax, 0
     je poll
     jl exit
+    mov rdi, rbx
+
+; rdi - server fd
+pollfds__scan:
+    mov r15, 0
+
+pollfds__scan__loop:
+    cmp r15, [pollfds_len]
+    jge return
+    mov r10w, [pollfds + r15 * pollfd_size + 6]
+    cmp r10w, 0
+    jne pollfds__scan__found
+    add r15, 1
+    jmp pollfds__scan__loop
+
+pollfds__scan__found:
+    mov r14d, [pollfds + r15 * pollfd_size]
+    cmp r14d, edi
+    je pollfds__scan__found__server
+
+pollfds__scan__found__client:
+    jmp exit
+    jmp pollfds__scan__loop
+
+pollfds__scan__found__server:
+    mov rax, SYS_ACCEPT
+    push rdi
+    mov rsi, 0
+    mov rdx, 0
+    syscall
+    cmp rax, 0
+    jl exit
+
+    mov rdi, rax
+    mov si, POLLIN | POLLOUT
+    call pollfds__append
+
+    pop rdi
+    jmp pollfds__scan__loop
+
+; edi - fd
+; si - events
+pollfds__append:
+    mov r10, [pollfds_len]
+    mov [pollfds + r10 * pollfd_size], edi
+    mov [pollfds + r10 * pollfd_size + 4], si
+    add r10, 1
+    mov [pollfds_len], r10
+    ret
+
+return:
+    ret
 
 exit:
     mov rax, SYS_EXIT
     mov rdi, 0
     syscall
-
-accept:
-    mov rdi, rax
-    mov rax, SYS_ACCEPT
-    mov rsi, 0
-    mov rdx, 0
-    syscall
-    ret
-
-; rax - array length
-; edi - fd
-; si - events
-; Returns new array length in rax
-pollfds__append:
-    mov [pollfds + rax], edi
-    mov [pollfds + rax + 4], si
-    add rax, 1
-    ret
-
-; Returns new array length in rax
-; rax - array length
-; edi - fd
-pollfds__remove:
-    mov r10d, edi
-    mov rdi, 0
-
-; Variables:
-; rax - array length
-; rdi - array index
-; r10d - fd
-; r11d - pollfds[rdi].fd
-pollfds__remove__loop:
-    cmp rdi, rax
-    jge return  ; fd was not found
-    mov r11d, [pollfds + rdi * pollfd_size]
-    add rdi, 1
-    cmp r11d, r10d
-    jne pollfds__remove__loop
-    sub rdi, 1
-
-; Returns new array length in rax
-; rax - array length
-; rdi - array index to remove
-pollfds__remove_index:
-    cmp rax, 1
-    jle pollfds__clear
-    mov r10d, [pollfds + (rax - 1) * pollfd_size]
-    mov [pollfds + rdi * pollfd_size], r10d
-    sub rax, 1
-    ret
-
-; Returns new array length in rax
-; rax - array length
-pollfds__clear:
-    mov rax, 0
-    ret
-
-return:
-    ret

poll_remove.s

@@ -0,0 +1,35 @@
+; Returns new array length in rax
+; edi - fd
+pollfds__remove:
+    mov r10d, edi
+    mov rdi, [pollfds_len]
+
+; Variables:
+; rdi - array length
+; rsi - array index
+; r10d - fd
+; r11d - pollfds[rdi].fd
+pollfds__remove__loop:
+    cmp rsi, rdi
+    jge return  ; fd was not found
+    mov r11d, [pollfds + rsi * pollfd_size]
+    add rsi, 1
+    cmp r11d, r10d
+    jne pollfds__remove__loop
+    sub rsi, 1
+
+; Returns new array length in rax
+; rdi - array length
+; rsi - array index to remove
+pollfds__remove_index:
+    cmp rdi, 1
+    jle pollfds__clear
+    mov r10d, [pollfds + (rdi - 1) * pollfd_size]
+    mov [pollfds + rsi * pollfd_size], r10d
+    sub rdi, 1
+    ret
+
+; Returns new array length in rax
+pollfds__clear:
+    mov rax, 0
+    ret

readme.md

@@ -1,10 +1,9 @@
 # x86_64 assembly
 
-https://userpages.cs.umbc.edu/tsimo1/CMSC313/nasmdoc/html/nasmdoc3.html
-https://x64.syscall.sh/
-
-https://web.stanford.edu/class/cs107/resources/x86-64-reference.pdf
-https://ggbaker.ca/295/x86.html
 https://josemariasola.github.io/reference/assembler/Stanford%20CS107%20Guide%20to%20x86-64.pdf
-
 https://www.bencode.net/blob/nasmcheatsheet.pdf
+https://x64.syscall.sh/
+https://userpages.cs.umbc.edu/tsimo1/CMSC313/nasmdoc/html/nasmdoc3.html
+https://web.stanford.edu/class/cs107/resources/x86-64-reference.pdf
+
+https://engineering.purdue.edu/ece264/22su/hw/ec02/resources/x64-intro.pdf