Системные вызовы для работы с |
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файлами |
section .data |
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filenamedb “/home/study/myfile”, |
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0 |
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int read( |
filelen |
equ 1024 |
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section .bss |
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int fd, |
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fd |
resb 4 |
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void *buf, |
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buffer |
resb 1024 |
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int len |
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… |
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); |
mov eax, 3 |
; syscall number |
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mov ebx, [fd] |
; int fd |
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mov ecx, buffer |
; void *buf |
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mov edx, filelen |
; int len |
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int 0x80 |
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Системные вызовы для работы с |
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файлами |
section .data |
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filenamedb “/home/study/myfile”, |
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0 |
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int close( |
filelen |
equ 1024 |
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section .bss |
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int fd |
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fd |
resb 4 |
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); |
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buffer |
resb 1024 |
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… |
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mov eax, 6 |
; syscall number |
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mov ebx, [fd] |
; int fd |
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int 0x80 |
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Системные вызовы для работы с |
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файламиint creat( |
mov eax, 8 |
; syscall number |
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const char *pathname, |
mov ebx, filename ; const char *pathname |
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mode_t mode |
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mov ecx, 777q |
; init perms |
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); |
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SYSCALL_DEFINE2( |
int 0x80 |
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creat, const char __user *, |
mov [fd], eax |
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{ |
pathname, int, mode) |
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return sys_open(pathname, |
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mov eax, 4 |
; syscall number |
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O_CREAT | O_WRONLY | |
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O_TRUNC, |
mov ebx, [fd] |
; file descriptor from |
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} |
mode); |
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int write( |
creat() |
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mov ecx, msg |
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int fd, |
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const void *buf, |
mov edx, msglen |
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int len |
int 0x80 |
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);
