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Add space for real stdin/out FileHandles 

Index the FileHandle array from 0 - now if filehandle[0..2] is
NULL, it uses the built-in serial for stdin/stdout/stderr,
else it will use a FileHandle.

No mechanism to actually put a FileHandle in that position yet.
pull/5571/head
Kevin Bracey 2017-11-23 11:58:24 +02:00
parent f391d8a0dc
commit b5ac071b66
1 changed files with 21 additions and 30 deletions
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51
platform/mbed_retarget.cpp
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@ -90,7 +90,6 @@ uint32_t mbed_heap_size = 0;
/* newlib has the filehandle field in the FILE struct as a short, so
* we can't just return a Filehandle* from _open and instead have to
* put it in a filehandles array and return the index into that array
* (or rather index+3, as filehandles 0-2 are stdin/out/err).
*/
static FileHandle *filehandles[OPEN_MAX];
static SingletonPtr<PlatformMutex> filehandle_mutex;
@ -226,10 +225,10 @@ extern "C" int open(const char *name, int oflag, ...) {
}
#endif
// find the first empty slot in filehandles
// find the first empty slot in filehandles, after the slots reserved for stdin/stdout/stderr
filehandle_mutex->lock();
unsigned int fh_i;
for (fh_i = 0; fh_i < sizeof(filehandles)/sizeof(*filehandles); fh_i++) {
for (fh_i = 3; fh_i < sizeof(filehandles)/sizeof(*filehandles); fh_i++) {
/* Take a next free filehandle slot available. */
if (filehandles[fh_i] == NULL) break;
}
@ -277,7 +276,7 @@ extern "C" int open(const char *name, int oflag, ...) {
filehandles[fh_i] = res;
return fh_i + 3; // +3 as filehandles 0-2 are stdin/out/err
return fh_i;
}
extern "C" int PREFIX(_close)(FILEHANDLE fh) {
@ -285,10 +284,8 @@ extern "C" int PREFIX(_close)(FILEHANDLE fh) {
}
extern "C" int close(int fh) {
if (fh < 3) return 0;
FileHandle* fhc = filehandles[fh-3];
filehandles[fh-3] = NULL;
FileHandle* fhc = filehandles[fh];
filehandles[fh] = NULL;
if (fhc == NULL) {
errno = EBADF;
return -1;
@ -330,7 +327,8 @@ extern "C" ssize_t write(int fh, const void *buf, size_t length) {
}
#endif
if (fh < 3) {
FileHandle* fhc = filehandles[fh];
if (fhc == NULL && fh < 3) {
#if DEVICE_SERIAL
if (!stdio_uart_inited) init_serial();
#if MBED_CONF_PLATFORM_STDIO_CONVERT_NEWLINES
@ -349,7 +347,6 @@ extern "C" ssize_t write(int fh, const void *buf, size_t length) {
#endif
n = length;
} else {
FileHandle* fhc = filehandles[fh-3];
if (fhc == NULL) {
errno = EBADF;
return -1;
@ -404,7 +401,8 @@ extern "C" ssize_t read(int fh, void *buf, size_t length) {
}
#endif
if (fh < 3) {
FileHandle* fhc = filehandles[fh];
if (fhc == NULL && fh < 3) {
// only read a character at a time from stdin
#if DEVICE_SERIAL
if (!stdio_uart_inited) init_serial();
@ -433,7 +431,6 @@ extern "C" ssize_t read(int fh, void *buf, size_t length) {
#endif
n = 1;
} else {
FileHandle* fhc = filehandles[fh-3];
if (fhc == NULL) {
errno = EBADF;
return -1;
@ -457,11 +454,11 @@ extern "C" int _isatty(FILEHANDLE fh)
}
extern "C" int isatty(int fh) {
/* stdin, stdout and stderr should be tty */
if (fh < 3) return 1;
FileHandle* fhc = filehandles[fh-3];
FileHandle* fhc = filehandles[fh];
if (fhc == NULL) {
/* stdin, stdout and stderr should be tty */
if (fh < 3) return 1;
errno = EBADF;
return 0;
}
@ -498,12 +495,12 @@ int _lseek(FILEHANDLE fh, int offset, int whence)
}
extern "C" off_t lseek(int fh, off_t offset, int whence) {
if (fh < 3) {
FileHandle* fhc = filehandles[fh];
if (fhc == NULL && fh < 3) {
errno = ESPIPE;
return -1;
}
FileHandle* fhc = filehandles[fh-3];
if (fhc == NULL) {
errno = EBADF;
return -1;
@ -524,9 +521,7 @@ extern "C" int PREFIX(_ensure)(FILEHANDLE fh) {
#endif
extern "C" int fsync(int fh) {
if (fh < 3) return 0;
FileHandle* fhc = filehandles[fh-3];
FileHandle* fhc = filehandles[fh];
if (fhc == NULL) {
errno = EBADF;
return -1;
@ -543,12 +538,12 @@ extern "C" int fsync(int fh) {
#ifdef __ARMCC_VERSION
extern "C" long PREFIX(_flen)(FILEHANDLE fh) {
if (fh < 3) {
FileHandle* fhc = filehandles[fh];
if (fhc == NULL && fh < 3) {
errno = EINVAL;
return -1;
}
FileHandle* fhc = filehandles[fh-3];
if (fhc == NULL) {
errno = EBADF;
return -1;
@ -595,12 +590,12 @@ extern "C" int _fstat(int fh, struct stat *st) {
#endif
extern "C" int fstat(int fh, struct stat *st) {
if (fh < 3) {
FileHandle* fhc = filehandles[fh];
if (fhc == NULL && fh < 3) {
st->st_mode = S_IFCHR;
return 0;
}
FileHandle* fhc = filehandles[fh-3];
if (fhc == NULL) {
errno = EBADF;
return -1;
@ -622,11 +617,7 @@ extern "C" int poll(struct pollfd fds[], nfds_t nfds, int timeout)
for (nfds_t n = 0; n < nfds; n++) {
// Underlying FileHandle poll returns POLLNVAL if given NULL, so
// we don't need to take special action.
if (fds[n].fd < 3) {
fhs[n].fh = NULL; // poll won't work on stdin/err/out yet
} else {
fhs[n].fh = filehandles[fds[n].fd - 3];
}
fhs[n].fh = filehandles[fds[n].fd];
fhs[n].events = fds[n].events;
}
int ret = poll(fhs, nfds, timeout);