Documentation updates for 0.4.
[paraslash.git] / file_write.c
index 016732a..1c534ae 100644 (file)
@@ -8,6 +8,7 @@
 
 #include <sys/types.h>
 #include <dirent.h>
+#include <sys/time.h>
 
 #include "para.h"
 #include "list.h"
@@ -27,26 +28,43 @@ struct private_file_write_data {
        int check_fd;
 };
 
+/*
+ * Get a random filename.
+ *
+ * This is by no means a secure way to create temporary files in a hostile
+ * directory like \p /tmp. However, we use it only for creating temp files in
+ * ~/.paraslash, for which it is OK. Result must be freed by the caller.
+ */
+__must_check __malloc static char *random_filename(void)
+{
+       char *result, *home = para_homedir();
+       struct timeval tv;
+
+       gettimeofday(&tv, NULL);
+       srandom(tv.tv_usec);
+       result = make_message("%s/.paraslash/%08lu", home,
+               para_random(99999999));
+       free(home);
+       return result;
+}
+
 static int file_write_open(struct writer_node *wn)
 {
        struct private_file_write_data *pfwd = para_calloc(
                sizeof(struct private_file_write_data));
        struct file_write_args_info *conf = wn->conf;
        char *filename;
+
        if (conf->filename_given)
                filename = conf->filename_arg;
-       else {
-               char *tmp = para_tmpname(), *home = para_homedir();
-               filename = make_message("%s/.paraslash/%s", home, tmp);
-               free(home);
-               free(tmp);
-       }
+       else
+               filename = random_filename();
        wn->private_data = pfwd;
        pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
        if (!conf->filename_given)
                free(filename);
        if (pfwd->fd >= 0)
-               return 8192;
+               return 1;
        free(pfwd);
        return -E_FW_OPEN;
 }
@@ -79,7 +97,7 @@ static int file_write_post_select(struct sched *s, struct writer_node *wn)
        if (!FD_ISSET(pfwd->fd, &s->wfds))
                return 1;
 //     PARA_INFO_LOG("writing %zd\n", *wng->loaded);
-       ret = write(pfwd->fd, wng->buf + wn->written,
+       ret = write(pfwd->fd, *wng->bufp + wn->written,
                *wng->loaded - wn->written);
        if (ret < 0)
                return -E_FW_WRITE;