340 lines
7.9 KiB
PHP
340 lines
7.9 KiB
PHP
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2017. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License. ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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F_READ = 0x0001 ; file opened for reading
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F_WRITE = 0x0002 ; file opened for writing
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O_CLOEXEC = 0x40000
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PIPE_BUFFER_SIZE = 4096
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iglobal
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align 4
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pipe_file_ops:
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dd pipe_close ;0
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dd pipe_read ;1
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dd pipe_write ;2
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endg
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;int pipe2(int pipefd[2], int flags);
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;ecx pipefd
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;edx flags
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align 4
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sys_pipe2:
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.pipeflags equ esp+16
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.pipefd equ esp+12
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.fdread equ esp+8
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.fdwrite equ esp+4
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.intpipe equ esp
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push ebp
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test ecx, ecx
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mov ebp, -EFAULT
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js .fail
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test edx, not O_CLOEXEC
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mov ebp, -EINVAL
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jnz .fail
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push edx
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push ecx
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sub esp, (5-2)*4
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mov ecx, sizeof.FILED
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call create_object
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mov [.fdread], eax
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test eax, eax
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mov ebp, -EMFILE
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jz .err_0
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mov ecx, sizeof.FILED
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call create_object
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mov [.fdwrite], eax
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test eax, eax
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jz .err_1
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mov eax, sizeof.PIPE
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call malloc
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test eax, eax
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mov ebp, -ENFILE
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jz .err_2
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mov ebp, eax
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stdcall create_ring_buffer, PIPE_BUFFER_SIZE, PG_SWR
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test eax, eax
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jz .err_3
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mov [ebp+PIPE.pipe_ops], pipe_file_ops
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mov [ebp+PIPE.buffer], eax
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xor eax, eax
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mov [ebp+PIPE.count], eax
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mov [ebp+PIPE.read_end], eax
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mov [ebp+PIPE.write_end], eax
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inc eax
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mov [ebp+PIPE.readers], eax
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mov [ebp+PIPE.writers], eax
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lea ecx, [ebp+PIPE.pipe_lock]
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call mutex_init
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lea ecx, [ebp+PIPE.rlist]
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list_init ecx
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lea ecx, [ebp+PIPE.wlist]
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list_init ecx
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mov eax, [.fdread]
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mov edx, [.fdwrite]
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mov ecx, [.pipefd]
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mov [eax+FILED.magic], 'PIPE'
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mov [eax+FILED.destroy], 0
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mov [eax+FILED.mode], F_READ
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mov [eax+FILED.file], ebp
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mov [edx+FILED.magic], 'PIPE'
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mov [edx+FILED.destroy], 0
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mov [edx+FILED.mode], F_WRITE
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mov [edx+FILED.file], ebp
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mov eax, [eax+FILED.handle]
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mov edx, [edx+FILED.handle]
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mov [ecx], eax
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mov [ecx+4], edx
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add esp, 5*4
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pop ebp
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xor eax, eax
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mov [esp+SYSCALL_STACK._eax], eax
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ret
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.err_3:
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mov eax, ebp
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call free
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mov ebp, -ENFILE
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.err_2:
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mov ecx, [.fdwrite]
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call destroy_object
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.err_1:
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mov ecx, [.fdread]
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call destroy_object
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.err_0:
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add esp, 5*4
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.fail:
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mov eax, ebp
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pop ebp
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mov [esp+SYSCALL_STACK._eax], eax
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ret
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purge .pipeflags
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purge .filefd
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purge .fdread
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purge .fdwrite
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purge .intpipe
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; edx dst_buf
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; esi read count
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; ebp pipe
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align 4
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pipe_read:
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mov edi, edx
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lea ecx, [ebp+PIPE.pipe_lock]
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call mutex_lock
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.again:
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xor eax, eax
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cmp eax, [ebp+PIPE.writers]
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je .eof
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mov ecx, [ebp+PIPE.count]
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test ecx, ecx
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jz .wait
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.check_count:
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cmp ecx, esi
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jb .read
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mov ecx, esi
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.read:
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mov esi, [ebp+PIPE.buffer]
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add esi, [ebp+PIPE.read_end]
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mov [esp+SYSCALL_STACK._eax], ecx
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sub [ebp+PIPE.count], ecx
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cld
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rep movsb
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and esi, 0xFFF
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mov [ebp+PIPE.read_end], esi
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lea ecx, [ebp+PIPE.wlist]
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cmp ecx, [ebp+PIPE.wlist.next]
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je @F
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mov ecx, [ecx+MUTEX_WAITER.task]
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mov [ecx+TASKDATA.state], TSTATE_RUNNING ;activate writer task
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@@:
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cmp [ebp+PIPE.count], 0
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je @F
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lea eax, [ebp+PIPE.rlist]
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cmp eax, [ebp+PIPE.rlist.next]
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je @F
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mov eax, [eax+MUTEX_WAITER.task]
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mov [eax+TASKDATA.state], TSTATE_RUNNING ;activate reader task
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@@:
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lea ecx, [ebp+PIPE.pipe_lock]
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call mutex_unlock
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ret
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.wait:
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pushfd
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cli
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sub esp, sizeof.MUTEX_WAITER
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mov ebx, [TASK_BASE]
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mov [esp+MUTEX_WAITER.task], ebx
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lea edx, [ebp+PIPE.rlist]
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list_add_tail esp, edx ;esp= new waiter, edx= list head
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lea ecx, [ebp+PIPE.pipe_lock]
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call mutex_unlock
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mov [ebx+TASKDATA.state], TSTATE_RUN_SUSPENDED
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call change_task
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lea ecx, [ebp+PIPE.pipe_lock]
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call mutex_lock
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list_del esp
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add esp, sizeof.MUTEX_WAITER
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popfd
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jmp .again
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.eof:
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mov [esp+SYSCALL_STACK._eax], eax
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lea ecx, [ebp+PIPE.pipe_lock]
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call mutex_unlock
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ret
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; edx src_buf
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; esi write count
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; ebp pipe
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align 4
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pipe_write:
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.written equ esp
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push 0 ;written
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mov ebx, esi ;ebx = write count
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mov esi, edx ;esi = src
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lea ecx, [ebp+PIPE.pipe_lock]
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call mutex_lock
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.again:
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xor eax, eax
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cmp eax, [ebp+PIPE.readers]
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je .epipe
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mov ecx, 4096
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sub ecx, [ebp+PIPE.count]
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jz .wait ;wait if buffer full
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.check_count:
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cmp ecx, ebx
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jb .write
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mov ecx, ebx
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.write:
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mov edi, [ebp+PIPE.buffer]
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add edi, [ebp+PIPE.write_end]
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add [.written], ecx
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sub ebx, ecx
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add [ebp+PIPE.count], ecx
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cld
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rep movsb
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and edi, 0xFFF
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mov [ebp+PIPE.write_end], edi
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pushfd
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cli
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lea eax, [ebp+PIPE.rlist]
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cmp eax, [ebp+PIPE.rlist.next]
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je @F
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mov eax, [eax+MUTEX_WAITER.task]
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mov [eax+TASKDATA.state], TSTATE_RUNNING ;activate reader task
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@@:
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cmp [ebp+PIPE.count], 4096
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je @F
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lea ecx, [ebp+PIPE.wlist]
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cmp ecx, [ebp+PIPE.wlist.next]
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je @F
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mov ecx, [eax+MUTEX_WAITER.task]
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mov [ecx+TASKDATA.state], TSTATE_RUNNING ;activate writer task
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@@:
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popfd
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lea ecx, [ebp+PIPE.pipe_lock]
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call mutex_unlock
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test ebx, ebx
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jnz .again
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pop eax ; written
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mov [esp+SYSCALL_STACK._eax], eax
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ret
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.wait:
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pushfd
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cli
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sub esp, sizeof.MUTEX_WAITER
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mov ecx, [TASK_BASE]
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mov [esp+MUTEX_WAITER.task], ecx
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lea edx, [ebp+PIPE.wlist]
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list_add_tail esp, edx ;esp= new waiter, edx= list head
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lea ecx, [ebp+PIPE.pipe_lock]
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call mutex_unlock
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mov [ecx+TASKDATA.state], TSTATE_RUN_SUSPENDED
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call change_task
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lea ecx, [ebp+PIPE.pipe_lock]
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call mutex_lock
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list_del esp
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add esp, sizeof.MUTEX_WAITER
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popfd
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jmp .again
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.epipe:
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lea ecx, [ebp+PIPE.pipe_lock]
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call mutex_unlock
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add esp, 4
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mov [esp+SYSCALL_STACK._eax], -EPIPE
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ret
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align 4
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pipe_close:
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mov [esp+SYSCALL_STACK._eax], -EBADF
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ret
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