syscall.h File Reference

#include "threads/synch.h"

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Functions
void	syscall_init (void)
void	close (int fd)
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Variables
struct lock	filesys_lock

Function Documentation

close()

void close

(

int

fd

)

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파일을 닫고 fd를 제거한다.

Parameters

fd

               {
    syscall1 (SYS_CLOSE, fd);
}

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syscall_init()

void syscall_init

(

void

)

                    {
    write_msr(MSR_STAR, ((uint64_t)SEL_UCSEG - 0x10) << 48  |
            ((uint64_t)SEL_KCSEG) << 32);
    write_msr(MSR_LSTAR, (uint64_t) syscall_entry);
 
    /* The interrupt service rountine should not serve any interrupts
     * until the syscall_entry swaps the userland stack to the kernel
     * mode stack. Therefore, we masked the FLAG_FL. */
    write_msr(MSR_SYSCALL_MASK,
            FLAG_IF | FLAG_TF | FLAG_DF | FLAG_IOPL | FLAG_AC | FLAG_NT);
    
    /*------------------------- [P2] System Call --------------------------*/   
    lock_init(&filesys_lock); // 파일 읽고 쓰기에 필요한 락 초기화 _defined "userprog/syscall.h"
}

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Variable Documentation

filesys_lock

struct lock filesys_lock