mirror of https://github.com/ARMmbed/mbed-os.git
Add mbed_file_handle lookup function
Add a necessary helper to allow FileHandle objects to be obtained from POSIX file descriptors. Primary envisaged use case is to act on STDIN_FILENO etc, eg to set it non-blocking or use sigio, or to use the enable API.pull/9797/head
Kevin Bracey
parent
649856f3ff
commit
f91d044b6c
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@ -290,7 +290,7 @@ static FileHandle *get_console(int fd)
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}
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/* Deal with the fact C library may not _open descriptors 0, 1, 2 - auto bind */
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static FileHandle *get_fhc(int fd)
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FileHandle *mbed::mbed_file_handle(int fd)
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{
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if (fd >= OPEN_MAX) {
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return NULL;
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@ -490,13 +490,13 @@ extern "C" FILEHANDLE PREFIX(_open)(const char *name, int openflags)
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/* Use the posix convention that stdin,out,err are filehandles 0,1,2.
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*/
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if (std::strcmp(name, __stdin_name) == 0) {
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get_fhc(STDIN_FILENO);
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mbed_file_handle(STDIN_FILENO);
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return STDIN_FILENO;
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} else if (std::strcmp(name, __stdout_name) == 0) {
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get_fhc(STDOUT_FILENO);
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mbed_file_handle(STDOUT_FILENO);
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return STDOUT_FILENO;
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} else if (std::strcmp(name, __stderr_name) == 0) {
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get_fhc(STDERR_FILENO);
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mbed_file_handle(STDERR_FILENO);
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return STDERR_FILENO;
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}
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#endif
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@ -555,7 +555,7 @@ extern "C" int PREFIX(_close)(FILEHANDLE fh)
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extern "C" int close(int fildes)
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{
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FileHandle *fhc = get_fhc(fildes);
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FileHandle *fhc = mbed_file_handle(fildes);
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filehandles[fildes] = NULL;
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if (fhc == NULL) {
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errno = EBADF;
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@ -667,7 +667,7 @@ finish:
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extern "C" ssize_t write(int fildes, const void *buf, size_t length)
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{
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FileHandle *fhc = get_fhc(fildes);
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FileHandle *fhc = mbed_file_handle(fildes);
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if (fhc == NULL) {
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errno = EBADF;
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return -1;
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@ -761,8 +761,7 @@ extern "C" int PREFIX(_read)(FILEHANDLE fh, unsigned char *buffer, unsigned int
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extern "C" ssize_t read(int fildes, void *buf, size_t length)
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{
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FileHandle *fhc = get_fhc(fildes);
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FileHandle *fhc = mbed_file_handle(fildes);
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if (fhc == NULL) {
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errno = EBADF;
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return -1;
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@ -789,7 +788,7 @@ extern "C" int _isatty(FILEHANDLE fh)
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extern "C" int isatty(int fildes)
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{
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FileHandle *fhc = get_fhc(fildes);
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FileHandle *fhc = mbed_file_handle(fildes);
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if (fhc == NULL) {
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errno = EBADF;
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return 0;
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@ -828,7 +827,7 @@ int _lseek(FILEHANDLE fh, int offset, int whence)
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extern "C" off_t lseek(int fildes, off_t offset, int whence)
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{
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FileHandle *fhc = get_fhc(fildes);
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FileHandle *fhc = mbed_file_handle(fildes);
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if (fhc == NULL) {
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errno = EBADF;
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return -1;
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@ -844,7 +843,7 @@ extern "C" off_t lseek(int fildes, off_t offset, int whence)
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extern "C" int ftruncate(int fildes, off_t length)
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{
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FileHandle *fhc = get_fhc(fildes);
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FileHandle *fhc = mbed_file_handle(fildes);
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if (fhc == NULL) {
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errno = EBADF;
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return -1;
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@ -868,7 +867,7 @@ extern "C" int PREFIX(_ensure)(FILEHANDLE fh)
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extern "C" int fsync(int fildes)
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{
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FileHandle *fhc = get_fhc(fildes);
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FileHandle *fhc = mbed_file_handle(fildes);
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if (fhc == NULL) {
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errno = EBADF;
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return -1;
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@ -886,7 +885,7 @@ extern "C" int fsync(int fildes)
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#ifdef __ARMCC_VERSION
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extern "C" long PREFIX(_flen)(FILEHANDLE fh)
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{
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FileHandle *fhc = get_fhc(fh);
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FileHandle *fhc = mbed_file_handle(fh);
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if (fhc == NULL) {
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errno = EBADF;
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return -1;
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@ -936,7 +935,7 @@ extern "C" int _fstat(int fh, struct stat *st)
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extern "C" int fstat(int fildes, struct stat *st)
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{
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FileHandle *fhc = get_fhc(fildes);
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FileHandle *fhc = mbed_file_handle(fildes);
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if (fhc == NULL) {
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errno = EBADF;
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return -1;
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@ -949,7 +948,7 @@ extern "C" int fstat(int fildes, struct stat *st)
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extern "C" int fcntl(int fildes, int cmd, ...)
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{
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FileHandle *fhc = get_fhc(fildes);
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FileHandle *fhc = mbed_file_handle(fildes);
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if (fhc == NULL) {
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errno = EBADF;
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return -1;
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@ -994,7 +993,7 @@ extern "C" int poll(struct pollfd fds[], nfds_t nfds, int timeout)
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for (nfds_t n = 0; n < nfds; n++) {
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// Underlying FileHandle poll returns POLLNVAL if given NULL, so
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// we don't need to take special action.
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fhs[n].fh = get_fhc(fds[n].fd);
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fhs[n].fh = mbed_file_handle(fds[n].fd);
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fhs[n].events = fds[n].events;
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}
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int ret = poll(fhs, nfds, timeout);
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@ -133,6 +133,27 @@ FileHandle *mbed_target_override_console(int fd);
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*/
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FileHandle *mbed_override_console(int fd);
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/** Look up the Mbed file handle corresponding to a file descriptor
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*
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* This conversion function permits an application to find the underlying
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* FileHandle object corresponding to a POSIX file descriptor.
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*
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* This allows access to specialized behavior only available via the
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* FileHandle API.
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*
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* Example of saving power by disabling console input - for buffered serial,
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* this would release the RX interrupt handler, which would release the
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* deep sleep lock.
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* @code
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* mbed_file_handle(STDIN_FILENO)->enable_input(false);
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* @endcode
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*
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* @param fd file descriptor
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* @return FileHandle pointer
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* NULL if descriptor does not correspond to a FileHandle (only
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* possible if it's not open with current implementation).
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*/
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FileHandle *mbed_file_handle(int fd);
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}
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typedef mbed::DirHandle DIR;
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