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#include <unistd.h>
#include <stdio.h>
#include "lock.hpp"
#include "socket.hpp"
/// Protected file writing
/// (Until the file is closed, it keeps the old file)
// Start writing a tmpfile
FILE *lock_fopen (const char *filename, int *info)
{
char newfile[512];
FILE *fp;
int no = getpid ();
// Get a filename that doesn't already exist
do
{
sprintf (newfile, "%s_%d.tmp", filename, no++);
}
while ((fp = fopen_ (newfile, "r")) && (fclose_ (fp), 1));
*info = --no;
return fopen_ (newfile, "w");
}
// Delete the old file and rename the new file
void lock_fclose (FILE * fp, const char *filename, int *info)
{
char newfile[512];
if (fp)
{
fclose_ (fp);
sprintf (newfile, "%s_%d.tmp", filename, *info);
rename (newfile, filename);
}
}
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