add stampfilefd() to avoid race condition

git-svn-id: http://opensvn.csie.org/pttbbs/trunk/pttbbs@1998 63ad8ddf-47c3-0310-b6dd-a9e9d9715204

1 files changed, 31 insertions, 0 deletions

diff --git a/mbbsd/record.c b/mbbsd/record.c
index c8393f6f..d50fb611 100644
--- a/mbbsd/record.c
+++ b/mbbsd/record.c
@@ -474,6 +474,37 @@ stampfile(char *fpath, fileheader_t * fh)
     return 0;
 }
 
+int
+stampfilefd(char *fpath, fileheader_t * fh)
+{
+    char           *ip = fpath;
+    time_t          dtime = COMMON_TIME;
+    struct tm      *ptime;
+    int             fd;
+
+    if (access(fpath, X_OK | R_OK | W_OK))
+	mkdir(fpath, 0755);
+
+    while (*(++ip))
+	;
+    *ip++ = '/';
+
+    while( 1 ) {
+	sprintf(ip, "M.%d.A.%3.3X", (int)++dtime, rand() & 0xFFF);
+	if( (fd = open(fpath, O_CREAT | O_EXCL | O_WRONLY, 0644)) != -1 )
+	    break;
+	if( errno != EEXIST )
+	    return -1;
+    }
+
+    memset(fh, 0, sizeof(fileheader_t));
+    strlcpy(fh->filename, ip, sizeof(fh->filename));
+    ptime = localtime(&dtime);
+    snprintf(fh->date, sizeof(fh->date),
+	     "%2d/%02d", ptime->tm_mon + 1, ptime->tm_mday);
+    return fd;
+}
+
 void
 stampdir(char *fpath, fileheader_t * fh)
 {