src/common/lock.c


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#include <unistd.h>
#include <stdio.h>
#include "lock.h"
#include "socket.h"

// �������݃t�@�C���̕ی쏈��
// �i�������݂��I���܂ŁA���t�@�C����ۊǂ��Ă����j

// �V�����t�@�C���̏������݊J�n
FILE *lock_fopen (const char *filename, int *info)
{
    char newfile[512];
    FILE *fp;
    int  no = getpid ();

    // ���S�ȃt�@�C�����𓾂�i�蔲���j
    do
    {
        sprintf (newfile, "%s_%d.tmp", filename, no++);
    }
    while ((fp = fopen_ (newfile, "r")) && fclose_ (fp));
    *info = --no;
    return fopen_ (newfile, "w");
}

// ���t�@�C�����폜���V�t�@�C�������l�[��
int lock_fclose (FILE * fp, const char *filename, int *info)
{
    int  ret = 0;
    char newfile[512];
    if (fp != NULL)
    {
        ret = fclose_ (fp);
        sprintf (newfile, "%s_%d.tmp", filename, *info);
        remove (filename);
        // ���̃^�C�~���O�ŗ�����ƍň��B
        rename (newfile, filename);
        return ret;
    }
    else
    {
        return 1;
    }
}