POSIX API
L6-4(1)
fs_flockfile() will block the calling task until the file is available. If the task
must write to the file only if no other task is currently accessing it, the
non-blocking function fs_funlockfile() can be used.
6-4 DIRECTORY ACCESS FUNCTIONS
The directory access functions provide an API for iterating through the entries within a
directory. The fs_opendir() function initiates this procedure, and each subsequent call to
fs_readdir_r() (until all entries have been examined) returns information about a
particular entry in a struct fs_dirent. The fs_closedir() function releases any file system
structures and locks.
Figure 6-2 gives an example using the directory access functions to list the files in a
directory. An example result of listing a directory is shown in Figure 4-1.
void App_Fnct (void)
{
FS_DIR *p_dir;
struct fs_dirent dirent;
struct fs_dirent *p_dirent;
char str[50];
char *p_cwd_path;
fs_time_t ts;
.
.
.
p_dir = fs_opendir(p_cwd_path); /* Open dir.
if (p_dir != (FS_DIR *)0) {
(void)fs_readdir_r(pdir, &dirent, &p_dirent); /* Rd first dir entry.
if (p_dirent == (FS_DIRENT *)0) { /* If NULL ... dir is empty.
APP_TRACE_INFO((“Empty dir: %s.\r\n”, p_cwd_path));
} else { /* Fmt info for each entry.
Str_Copy(str, "-r--r—r-- : ");
while (p_dirent != (struct dirent *)0) {
/* Chk if file is dir.
if (DEF_BIT_IS_SET(dirent.Info.Attrib, FS_ENTRY_ATTRIB_DIR) == DEF_YES) {
str[0] = ‘d’;
}
/* Chk if file is rd only.
*/
*/
*/
*/
*/
*/
94
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