Overview. NuttX includes an optional, scalable file system. This file-system may be omitted altogther; NuttX does not depend on the presence @@ -5898,7 +5900,7 @@ interface of the same name. in a file-system-like name space.
-#include <fcntl.h> int open(const char *path, int oflag, ...); @@ -5920,7 +5922,7 @@ interface of the same name. int ioctl(int fd, int req, unsigned long arg);-
#include <dirent.h> int closedir(DIR *dirp); @@ -5932,7 +5934,7 @@ interface of the same name. int telldir(FAR DIR *dirp);-
#include <stdio.h> int fclose(FILE *stream); @@ -5964,12 +5966,139 @@ interface of the same name. int fstat(int fd, FAR struct stat *buf); /* Prototyped but not implemented */ char *getcwd(FAR char *buf, size_t size); /* Prototyped but not implemented */ int mkdir(const char *path, mode_t mode); - int mkfifo(const char *path, mode_t mode); int rmdir(const char *path); int stat(const char *path, FAR struct stat *buf); int statfs(const char *path, FAR struct statfs *buf); /* Prototyped but not implemented */+
pipe+ Function Prototype: +
++ #include++ int pipe(int filedes[2]); +
+ Description: +
+ pipe() creates a pair of file descriptors, pointing to a pipe inode, and
+ places them in the array pointed to by filedes.
+ filedes[0] is for reading, filedes[1] is for writing.
+
+ Input Parameters: +
filedes[2]. The user provided array in which to catch the pipe file descriptors.+ Returned Values: +
+ 0 is returned on success; otherwise, -1 is returned with errno set appropriately.
+
mkfifo+ Function Prototype: +
++ #include++ int mkfifo(FAR const char *pathname, mode_t mode); +
+ Description: +
+ mkfifo() makes a FIFO device driver file with name pathname.
+ Unlike Linux, a NuttX FIFO is not a special file type but simply a device driver instance.
+ mode specifies the FIFO's permissions (but is ignored in the current implementation).
+
+ Once the FIFO has been created by mkfifo(), any thread can open it for
+ reading or writing, in the same way as an ordinary file.
+ However, it must have been opened from both reading and writing before input or output can be performed.
+ This FIFO implementation will block all attempts to open a FIFO read-only until at least one thread has opened the FIFO for writing.
+
+ If all threads that write to the FIFO have closed, subsequent calls to read() on the FIFO will return 0 (end-of-file).
+
+ Input Parameters: +
pathname.
+ The full path to the FIFO instance to attach to or to create (if not already created).
+ mode.
+ Ignored for now
+ + Returned Values: +
+ 0 is returned on success; otherwise, -1 is returned with errno set appropriately.
+
setenv+ Function Prototype: +
++ #include++ int setenv(const char *name, const char *value, int overwrite); +
+ Description: +
+ The setenv() function adds the variable name to the environment with the
+ specified value if the variable name does not exist. If the name
+ does exist in the environment, then its value is changed to value if overwrite
+ is non-zero; if overwrite is zero, then the value of name is unaltered.
+
+ Input Parameters: +
name
+ The name of the variable to change.
+ value
+ The new value of the variable.
+ value
+ Replace any existing value if non-zero.
+ + Returned Values: +
+ Zero on success. +
+NuttX includes a simple interface layer based on uIP (see http://www.sics.se). NuttX supports subset of a standard socket interface to uIP. @@ -6811,7 +6940,8 @@ notify a task when a message is available on a queue.