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- /*
- Copyright 1990,1991,1992 Eric R. Smith.
- Copyright 1992,1993,1994 Atari Corporation.
- All rights reserved.
- */
-
- /* DOS file handling routines */
-
- #include "mint.h"
-
- static long do_dup P_((int,int));
- static void unselectme P_((PROC *));
-
- /*
- * first, some utility routines
- */
-
- FILEPTR *
- do_open(name, rwmode, attr, x)
- const char *name; /* file name */
- int rwmode; /* file access mode */
- int attr; /* TOS attributes for created files (if applicable) */
- XATTR *x; /* filled in with attributes of opened file */
- {
- struct tty *tty;
- fcookie dir, fc;
- long devsp;
- FILEPTR *f;
- DEVDRV *dev;
- long r;
- XATTR xattr;
- unsigned perm;
- int creating;
- char temp1[PATH_MAX];
- extern FILESYS proc_filesys;
-
- /* for special BIOS "fake" devices */
- extern DEVDRV fakedev;
-
- TRACE(("do_open(%s)", name));
-
- /*
- * first step: get a cookie for the directory
- */
-
- r = path2cookie(name, temp1, &dir);
- if (r) {
- mint_errno = (int)r;
- DEBUG(("do_open(%s): error %ld", name, r));
- return NULL;
- }
-
- /*
- * second step: try to locate the file itself
- */
- r = relpath2cookie(&dir, temp1, follow_links, &fc, 0);
-
- /*
- * file found: this is an error if (O_CREAT|O_EXCL) are set
- */
-
- if ( (r == 0) && ( (rwmode & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) ) ) {
- DEBUG(("do_open(%s): file already exists",name));
- mint_errno = EACCDN;
- release_cookie(&fc);
- release_cookie(&dir);
- return NULL;
- }
- /*
- * file not found: maybe we should create it
- * note that if r != 0, the fc cookie is invalid (so we don't need to
- * release it)
- */
- if (r == EFILNF && (rwmode & O_CREAT)) {
- /* check first for write permission in the directory */
- r = (*dir.fs->getxattr)(&dir, &xattr);
- if (r == 0) {
- if (denyaccess(&xattr, S_IWOTH))
- r = EACCDN;
- }
- if (r) {
- DEBUG(("do_open(%s): couldn't get "
- "write permission on directory",name));
- mint_errno = (int)r;
- release_cookie(&dir);
- return NULL;
- }
- r = (*dir.fs->creat)(&dir, temp1,
- (S_IFREG|DEFAULT_MODE) & (~curproc->umask), attr, &fc);
- if (r) {
- DEBUG(("do_open(%s): error %ld while creating file",
- name, r));
- mint_errno = (int)r;
- release_cookie(&dir);
- return NULL;
- }
- creating = 1;
- } else if (r) {
- DEBUG(("do_open(%s): error %ld while searching for file",
- name, r));
- mint_errno = (int)r;
- release_cookie(&dir);
- return NULL;
- } else {
- creating = 0;
- }
-
- /*
- * check now for permission to actually access the file
- */
- r = (*fc.fs->getxattr)(&fc, &xattr);
- if (r) {
- DEBUG(("do_open(%s): couldn't get file attributes",name));
- mint_errno = (int)r;
- release_cookie(&dir);
- release_cookie(&fc);
- return NULL;
- }
- /*
- * we don't do directories
- */
- if ( (xattr.mode & S_IFMT) == S_IFDIR ) {
- DEBUG(("do_open(%s): file is a directory",name));
- release_cookie(&dir);
- release_cookie(&fc);
- mint_errno = EFILNF;
- return NULL;
- }
-
- switch (rwmode & O_RWMODE) {
- case O_WRONLY:
- perm = S_IWOTH;
- break;
- case O_RDWR:
- perm = S_IROTH|S_IWOTH;
- break;
- case O_EXEC:
- perm = (fc.fs->fsflags & FS_NOXBIT) ? S_IROTH : S_IXOTH;
- break;
- case O_RDONLY:
- perm = S_IROTH;
- break;
- default:
- perm = 0;
- ALERT("do_open: bad file access mode: %x", rwmode);
- }
- if (!creating && denyaccess(&xattr, perm)) {
- DEBUG(("do_open(%s): access to file denied",name));
- release_cookie(&dir);
- release_cookie(&fc);
- mint_errno = EACCDN;
- return NULL;
- }
-
- /*
- * an extra check for write access -- even the superuser shouldn't
- * write to files with the FA_RDONLY attribute bit set (unless,
- * we just created the file, or unless the file is on the proc
- * file system and hence FA_RDONLY has a different meaning)
- */
- if ( !creating && (xattr.attr & FA_RDONLY) && fc.fs != &proc_filesys) {
- if ( (rwmode & O_RWMODE) == O_RDWR ||
- (rwmode & O_RWMODE) == O_WRONLY ) {
- DEBUG(("do_open(%s): can't write a read-only file",
- name));
- release_cookie(&dir);
- release_cookie(&fc);
- mint_errno = EACCDN;
- return NULL;
- }
- }
-
- /*
- * if writing to a setuid or setgid file, clear those bits
- */
- if ( (perm & S_IWOTH) && (xattr.mode & (S_ISUID|S_ISGID)) ) {
- xattr.mode &= ~(S_ISUID|S_ISGID);
- (*fc.fs->chmode)(&fc, (xattr.mode & ~S_IFMT));
- }
- /*
- * If the caller asked for the attributes of the opened file, copy them over.
- */
- if (x) *x = xattr;
-
- /*
- * So far, so good. Let's get the device driver now, and try to
- * actually open the file.
- */
- dev = (*fc.fs->getdev)(&fc, &devsp);
- if (!dev) {
- mint_errno = (int)devsp;
- DEBUG(("do_open(%s): device driver not found",name));
- release_cookie(&dir);
- release_cookie(&fc);
- return NULL;
- }
-
- if (dev == &fakedev) { /* fake BIOS devices */
- f = curproc->handle[devsp];
- if (!f) {
- mint_errno = EIHNDL;
- return 0;
- }
- f->links++;
- release_cookie(&dir);
- release_cookie(&fc);
- return f;
- }
- if (0 == (f = new_fileptr())) {
- release_cookie(&dir);
- release_cookie(&fc);
- mint_errno = ENSMEM;
- return NULL;
- }
- f->links = 1;
- f->flags = rwmode;
- f->pos = 0;
- f->devinfo = devsp;
- f->fc = fc;
- f->dev = dev;
- release_cookie(&dir);
-
- r = (*dev->open)(f);
- if (r < 0) {
- DEBUG(("do_open(%s): device open failed with error %ld",
- name, r));
- mint_errno = (int)r;
- f->links = 0;
- release_cookie(&fc);
- dispose_fileptr(f);
- return NULL;
- }
-
- /* special code for opening a tty */
- if (is_terminal(f)) {
- extern struct tty default_tty; /* in tty.c */
-
- tty = (struct tty *)f->devinfo;
- if (tty->use_cnt == 0) { /* first open for this device? */
- *tty = default_tty;
- }
- tty->use_cnt++;
- }
- return f;
- }
-
- /*
- * helper function for do_close: this closes the indicated file pointer which
- * is assumed to be associated with process p. The extra parameter is necessary
- * because f_midipipe mucks with file pointers of other processes, so
- * sometimes p != curproc.
- *
- * Note that the function changedrv() in filesys.c can call this routine.
- * in that case, f->dev will be 0 to represent an invalid device, and
- * we cannot call the device close routine.
- */
-
- long
- do_pclose(p, f)
- PROC *p;
- FILEPTR *f;
- {
- long r = 0;
-
- if (!f) return EIHNDL;
-
- /* if this file is "select'd" by this process, unselect it
- * (this is just in case we were killed by a signal)
- */
-
- /* BUG? Feature? If media change is detected while we're doing the select,
- * we'll never unselect (since f->dev is set to NULL by changedrv())
- */
- if (f->dev) {
- (*f->dev->unselect)(f, (long)p, O_RDONLY);
- (*f->dev->unselect)(f, (long)p, O_WRONLY);
- }
-
- f->links--;
-
- /* TTY manipulation must be done *before* calling the device close routine,
- * since afterwards the TTY structure may no longer exist
- */
- if (is_terminal(f) && f->links <= 0) {
- struct tty *tty = (struct tty *)f->devinfo;
- tty->use_cnt--;
- if (tty->use_cnt <= 0)
- tty->pgrp = 0;
- if (tty->use_cnt <= 0 && tty->xkey) {
- kfree(tty->xkey);
- tty->xkey = 0;
- }
- }
-
- if (f->dev) {
- r = (*f->dev->close)(f, p->pid);
- if (r) {
- DEBUG(("close: device close failed"));
- }
- }
- if (f->links <= 0) {
- release_cookie(&f->fc);
- dispose_fileptr(f);
- }
- return r;
- }
-
- long
- do_close(f)
- FILEPTR *f;
- {
- return do_pclose(curproc, f);
- }
-
- long ARGS_ON_STACK
- f_open(name, mode)
- const char *name;
- int mode;
- {
- int i;
- FILEPTR *f;
- PROC *proc;
-
- TRACE(("Fopen(%s, %x)", name, mode));
- #if O_GLOBAL
- if (mode & O_GLOBAL) {
- /* oh, boy! user wants us to open a global handle! */
- proc = rootproc;
- }
- else
- #endif
- proc = curproc;
-
- for (i = MIN_OPEN; i < MAX_OPEN; i++) {
- if (!proc->handle[i])
- goto found_for_open;
- }
- DEBUG(("Fopen(%s): process out of handles",name));
- return ENHNDL; /* no more handles */
-
- found_for_open:
- mode &= O_USER; /* make sure the mode is legal */
-
- /* note: file mode 3 is reserved for the kernel; for users, transmogrify it
- * into O_RDWR (mode 2)
- */
- if ( (mode & O_RWMODE) == O_EXEC ) {
- mode = (mode & ~O_RWMODE) | O_RDWR;
- }
-
- proc->handle[i] = (FILEPTR *)1; /* reserve this handle */
- f = do_open(name, mode, 0, (XATTR *)0);
- proc->handle[i] = (FILEPTR *)0;
-
- if (!f) {
- return mint_errno;
- }
- proc->handle[i] = f;
- /* default is to close non-standard files on exec */
- proc->fdflags[i] = FD_CLOEXEC;
-
- #if O_GLOBAL
- if (proc != curproc) {
- /* we just opened a global handle */
- i += 100;
- }
- #endif
-
- TRACE(("Fopen: returning %d", i));
- return i;
- }
-
- long ARGS_ON_STACK
- f_create(name, attrib)
- const char *name;
- int attrib;
- {
- fcookie dir;
- int i;
- FILEPTR *f;
- long r;
- PROC *proc;
- int offset = 0;
- char temp1[PATH_MAX];
-
- TRACE(("Fcreate(%s, %x)", name, attrib));
- #if O_GLOBAL
- if (attrib & O_GLOBAL) {
- proc = rootproc;
- offset = 100;
- attrib &= ~O_GLOBAL;
- }
- else
- #endif
- proc = curproc;
-
- for (i = MIN_OPEN; i < MAX_OPEN; i++) {
- if (!proc->handle[i])
- goto found_for_create;
- }
- DEBUG(("Fcreate(%s): process out of handles",name));
- return ENHNDL; /* no more handles */
-
- found_for_create:
- if (attrib == FA_LABEL) {
- r = path2cookie(name, temp1, &dir);
- if (r) return r;
- r = (*dir.fs->writelabel)(&dir, temp1);
- release_cookie(&dir);
- if (r) return r;
- /*
- * just in case the caller tries to do something with this handle,
- * make it point to u:\dev\null
- */
- f = do_open("u:\\dev\\null", O_RDWR|O_CREAT|O_TRUNC, 0,
- (XATTR *)0);
- proc->handle[i] = f;
- proc->fdflags[i] = FD_CLOEXEC;
- return i+offset;
- }
- if (attrib & (FA_LABEL|FA_DIR)) {
- DEBUG(("Fcreate(%s,%x): illegal attributes",name,attrib));
- return EACCDN;
- }
-
- proc->handle[i] = (FILEPTR *)1; /* reserve this handle */
- f = do_open(name, O_RDWR|O_CREAT|O_TRUNC, attrib, (XATTR *)0);
- proc->handle[i] = (FILEPTR *)0;
-
- if (!f) {
- DEBUG(("Fcreate(%s) failed, error %d", name, mint_errno));
- return mint_errno;
- }
- proc->handle[i] = f;
- proc->fdflags[i] = FD_CLOEXEC;
- i += offset;
- TRACE(("Fcreate: returning %d", i));
- return i;
- }
-
- long ARGS_ON_STACK
- f_close(fh)
- int fh;
- {
- FILEPTR *f;
- long r;
- PROC *proc;
-
- TRACE(("Fclose: %d", fh));
- #if O_GLOBAL
- if (fh >= 100) {
- fh -= 100;
- proc = rootproc;
- }
- else
- #endif
- proc = curproc;
-
- if (fh < 0 || fh >= MAX_OPEN || 0 == (f = proc->handle[fh])) {
- return EIHNDL;
- }
- r = do_pclose(proc, f);
-
- /* standard handles should be restored to default values */
- /* do this for TOS domain only! */
- if (proc->domain == DOM_TOS) {
- if (fh == 0 || fh == 1)
- f = proc->handle[-1];
- else if (fh == 2 || fh == 3)
- f = proc->handle[-fh];
- else
- f = 0;
- } else
- f = 0;
-
- if (f) {
- f->links++;
- proc->fdflags[fh] = 0;
- }
- proc->handle[fh] = f;
- return r;
- }
-
- long ARGS_ON_STACK
- f_read(fh, count, buf)
- int fh;
- long count;
- char *buf;
- {
- FILEPTR *f;
-
- PROC *proc;
-
- #if O_GLOBAL
- if (fh >= 100) {
- fh -= 100;
- proc = rootproc;
- }
- else
- #endif
- proc = curproc;
-
- if (fh < MIN_HANDLE || fh >= MAX_OPEN || 0 == (f = proc->handle[fh])) {
- DEBUG(("Fread: invalid handle: %d", fh));
- return EIHNDL;
- }
- if ( (f->flags & O_RWMODE) == O_WRONLY ) {
- DEBUG(("Fread: read on a write-only handle"));
- return EACCDN;
- }
- if (is_terminal(f))
- return tty_read(f, buf, count);
-
- TRACELOW(("Fread: %ld bytes from handle %d to %lx", count, fh, buf));
- return (*f->dev->read)(f, buf, count);
- }
-
- long ARGS_ON_STACK
- f_write(fh, count, buf)
- int fh;
- long count;
- const char *buf;
- {
- FILEPTR *f;
- PROC *proc;
- long r;
-
- #if O_GLOBAL
- if (fh >= 100) {
- fh -= 100;
- proc = rootproc;
- }
- else
- #endif
- proc = curproc;
-
- if (fh < MIN_HANDLE || fh >= MAX_OPEN || 0 == (f = proc->handle[fh])) {
- DEBUG(("Fwrite: bad handle: %d", fh));
- return EIHNDL;
- }
- if ( (f->flags & O_RWMODE) == O_RDONLY ) {
- DEBUG(("Fwrite: write on a read-only handle"));
- return EACCDN;
- }
- if (is_terminal(f))
- return tty_write(f, buf, count);
-
- /* it would be faster to do this in the device driver, but this
- * way the drivers are easier to write
- */
- if (f->flags & O_APPEND) {
- r = (*f->dev->lseek)(f, 0L, SEEK_END);
- /* ignore errors from unseekable files (e.g. pipes) */
- if (r == EACCDN)
- r = 0;
- } else
- r = 0;
- if (r >= 0) {
- TRACELOW(("Fwrite: %ld bytes to handle %d", count, fh));
- r = (*f->dev->write)(f, buf, count);
- }
- if (r < 0) {
- DEBUG(("Fwrite: error %ld", r));
- }
- return r;
- }
-
- long ARGS_ON_STACK
- f_seek(place, fh, how)
- long place;
- int fh;
- int how;
- {
- FILEPTR *f;
- PROC *proc;
-
- TRACE(("Fseek(%ld, %d) on handle %d", place, how, fh));
- #if O_GLOBAL
- if (fh >= 100) {
- fh -= 100;
- proc = rootproc;
- }
- else
- #endif
- proc = curproc;
-
- if (fh < MIN_HANDLE || fh >= MAX_OPEN || 0 == (f = proc->handle[fh])) {
- DEBUG(("Fseek: bad handle: %d", fh));
- return EIHNDL;
- }
- if (is_terminal(f)) {
- return 0;
- }
- return (*f->dev->lseek)(f, place, how);
- }
-
- /* duplicate file pointer fh; returns a new file pointer >= min, if
- one exists, or ENHNDL if not. called by f_dup and f_cntl
- */
-
- static long do_dup(fh, min)
- int fh, min;
- {
- FILEPTR *f;
- int i;
- PROC *proc;
-
- for (i = min; i < MAX_OPEN; i++) {
- if (!curproc->handle[i])
- goto found;
- }
- return ENHNDL; /* no more handles */
- found:
- #if O_GLOBAL
- if (fh >= 100) {
- fh -= 100;
- proc = rootproc;
- } else
- #endif
- proc = curproc;
-
- if (fh < MIN_HANDLE || fh >= MAX_OPEN || 0 == (f = proc->handle[fh]))
- return EIHNDL;
-
- curproc->handle[i] = f;
-
- /* set default file descriptor flags */
- if (i >= 0) {
- if (i >= MIN_OPEN)
- curproc->fdflags[i] = FD_CLOEXEC;
- else
- curproc->fdflags[i] = 0;
- }
- f->links++;
- return i;
- }
-
- long ARGS_ON_STACK
- f_dup(fh)
- int fh;
- {
- long r;
- r = do_dup(fh, MIN_OPEN);
- TRACE(("Fdup(%d) -> %ld", fh, r));
- return r;
- }
-
- long ARGS_ON_STACK
- f_force(newh, oldh)
- int newh;
- int oldh;
- {
- FILEPTR *f;
- PROC *proc;
-
- TRACE(("Fforce(%d, %d)", newh, oldh));
-
- #if O_GLOBAL
- if (oldh >= 100) {
- oldh -= 100;
- proc = rootproc;
- } else
- #endif
- proc = curproc;
-
- if (oldh < MIN_HANDLE || oldh >= MAX_OPEN ||
- 0 == (f = proc->handle[oldh])) {
- DEBUG(("Fforce: old handle invalid"));
- return EIHNDL;
- }
-
- if (newh < MIN_HANDLE || newh >= MAX_OPEN) {
- DEBUG(("Fforce: new handle out of range"));
- return EIHNDL;
- }
-
- (void)do_close(curproc->handle[newh]);
- curproc->handle[newh] = f;
- /* set default file descriptor flags */
- if (newh >= 0)
- curproc->fdflags[newh] = (newh >= MIN_OPEN) ? FD_CLOEXEC : 0;
- f->links++;
- /*
- * special: for a tty, if this is becoming a control terminal and the
- * tty doesn't have a pgrp yet, make it have the pgrp of the process
- * doing the Fforce
- */
- if (is_terminal(f) && newh == -1) {
- struct tty *tty = (struct tty *)f->devinfo;
-
- if (!tty->pgrp)
- tty->pgrp = curproc->pgrp;
- }
- return 0;
- }
-
- long ARGS_ON_STACK
- f_datime(timeptr, fh, rwflag)
- short *timeptr;
- int fh;
- int rwflag;
- {
- FILEPTR *f;
- PROC *proc;
-
- TRACE(("Fdatime(%d)", fh));
- #if O_GLOBAL
- if (fh >= 100) {
- fh -= 100;
- proc = rootproc;
- }
- else
- #endif
- proc = curproc;
-
- if (fh < MIN_HANDLE || fh >= MAX_OPEN || 0 == (f = proc->handle[fh])) {
- DEBUG(("Fdatime: invalid handle"));
- return EIHNDL;
- }
-
- /* some programs use Fdatime to test for TTY devices */
- if (is_terminal(f))
- return EACCDN;
-
- return (*f->dev->datime)(f, timeptr, rwflag);
- }
-
- long ARGS_ON_STACK
- f_lock(fh, mode, start, length)
- int fh, mode;
- long start, length;
- {
- FILEPTR *f;
- struct flock lock;
- PROC *proc;
-
- #if O_GLOBAL
- if (fh >= 100) {
- fh -= 100;
- proc = rootproc;
- }
- else
- #endif
- proc = curproc;
-
- if (fh < MIN_HANDLE || fh >= MAX_OPEN || 0 == (f = proc->handle[fh])) {
- DEBUG(("Flock: invalid handle"));
- return EIHNDL;
- }
- TRACE(("Flock(%d,%d,%ld,%ld)", fh, mode, start, length));
- lock.l_whence = SEEK_SET;
- lock.l_start = start;
- lock.l_len = length;
-
- if (mode == 0) /* create a lock */
- lock.l_type = F_WRLCK;
- else if (mode == 1) /* unlock region */
- lock.l_type = F_UNLCK;
- else
- return EINVFN;
-
- return (*f->dev->ioctl)(f, F_SETLK, &lock);
- }
-
- /*
- * extensions to GEMDOS:
- */
-
- /*
- * Fpipe(int *handles): opens a pipe. if successful, returns 0, and
- * sets handles[0] to a file descriptor for the read end of the pipe
- * and handles[1] to one for the write end.
- */
-
- long ARGS_ON_STACK
- f_pipe(usrh)
- short *usrh;
- {
- FILEPTR *in, *out;
- static int pipeno = 0;
- int i, j;
- char pipename[32]; /* MAGIC: 32 >= strlen "u:\pipe\sys$pipe.000\0" */
-
- TRACE(("Fpipe"));
-
- /* BUG: more than 999 open pipes hangs the system */
- do {
- ksprintf(pipename, "u:\\pipe\\sys$pipe.%03d", pipeno);
- pipeno++; if (pipeno > 999) pipeno = 0;
- out = do_open(pipename, O_WRONLY|O_CREAT|O_EXCL, FA_RDONLY|FA_HIDDEN|FA_CHANGED,
- (XATTR *)0);
- /* read-only attribute means unidirectional fifo */
- /* hidden attribute means check for broken pipes */
- /* changed attribute means act like Unix fifos */
- } while (out == 0 && mint_errno == EACCDN);
-
- if (!out) {
- DEBUG(("Fpipe: error %d", mint_errno));
- return mint_errno;
- }
-
- in = do_open(pipename, O_RDONLY, 0, (XATTR *)0);
- if (!in) {
- DEBUG(("Fpipe: in side of pipe not opened (error %d)",
- mint_errno));
- (void)do_close(out);
- return mint_errno;
- }
-
- for (i = MIN_OPEN; i < MAX_OPEN; i++) {
- if (curproc->handle[i] == 0)
- break;
- }
-
- for (j = i+1; j < MAX_OPEN; j++) {
- if (curproc->handle[j] == 0)
- break;
- }
-
- if (j >= MAX_OPEN) {
- DEBUG(("Fpipe: not enough handles left"));
- (void) do_close(in);
- (void) do_close(out);
- return ENHNDL;
- }
- curproc->handle[i] = in; curproc->handle[j] = out;
- /* leave pipes open across Pexec */
- curproc->fdflags[i] = 0;
- curproc->fdflags[j] = 0;
-
- usrh[0] = i;
- usrh[1] = j;
- TRACE(("Fpipe: returning 0: input %d output %d",i,j));
- return 0;
- }
-
- /*
- * f_cntl: a combination "ioctl" and "fcntl". Some functions are
- * handled here, if they apply to the file descriptors directly
- * (e.g. F_DUPFD) or if they're easily translated into file system
- * functions (e.g. FSTAT). Others are passed on to the device driver
- * via dev->ioctl.
- */
-
- long ARGS_ON_STACK
- f_cntl(fh, arg, cmd)
- int fh;
- long arg;
- int cmd;
- {
- FILEPTR *f;
- PROC *proc;
- struct flock *fl;
- long r;
-
- TRACE(("Fcntl(%d, cmd=0x%x)", fh, cmd));
- #if O_GLOBAL
- if (fh >= 100) {
- fh -= 100;
- proc = rootproc;
- }
- else
- #endif
- proc = curproc;
-
- if (fh < MIN_HANDLE || fh >= MAX_OPEN) {
- DEBUG(("Fcntl: bad file handle"));
- return EIHNDL;
- }
-
- if (cmd == F_DUPFD) {
- #if O_GLOBAL
- if (proc != curproc) fh += 100;
- #endif
- return do_dup(fh, (int)arg);
- }
-
- f = proc->handle[fh];
- if (!f) return EIHNDL;
-
- switch(cmd) {
- case F_GETFD:
- TRACE(("Fcntl F_GETFD"));
- if (fh < 0) return EIHNDL;
- return proc->fdflags[fh];
- case F_SETFD:
- TRACE(("Fcntl F_SETFD"));
- if (fh < 0) return EIHNDL;
- proc->fdflags[fh] = arg;
- return 0;
- case F_GETFL:
- TRACE(("Fcntl F_GETFL"));
- return f->flags & O_USER;
- case F_SETFL:
- TRACE(("Fcntl F_SETFL"));
- arg &= O_USER; /* make sure only user bits set */
- #if 0
- /* COMPATIBILITY WITH OLD VERSIONS ONLY */
- /* THIS CODE WILL GO AWAY. REALLY! */
- if (arg & 4) {
- arg |= O_NDELAY;
- arg &= ~4;
- }
- #endif
-
- /* make sure the file access and sharing modes are not changed */
- arg &= ~(O_RWMODE|O_SHMODE);
- arg |= f->flags & (O_RWMODE|O_SHMODE);
- f->flags &= ~O_USER; /* set user bits to arg */
- f->flags |= arg;
- return 0;
- case FSTAT:
- return (*f->fc.fs->getxattr)(&f->fc, (XATTR *)arg);
- case F_SETLK:
- case F_SETLKW:
- /* make sure that the file was opened with appropriate permissions */
- fl = (struct flock *)arg;
- if (fl->l_type == F_RDLCK) {
- if ( (f->flags & O_RWMODE) == O_WRONLY )
- return EACCDN;
- } else {
- if ( (f->flags & O_RWMODE) == O_RDONLY )
- return EACCDN;
- }
- /* fall through to device ioctl */
- default:
- TRACE(("Fcntl mode %x: calling ioctl",cmd));
- r = (*f->dev->ioctl)(f, cmd, (void *)arg);
- if (r == EINVFN && is_terminal(f)) {
- r = tty_ioctl(f, cmd, (void *)arg);
- }
- return r;
- }
- }
-
- /*
- * fselect(timeout, rfd, wfd, xfd)
- * timeout is an (unsigned) 16 bit integer giving the maximum number
- * of milliseconds to wait; rfd, wfd, and xfd are pointers to 32 bit
- * integers containing bitmasks that describe which file descriptors
- * we're interested in. These masks are changed to represent which
- * file descriptors actually have data waiting (rfd), are ready to
- * output (wfd), or have exceptional conditions (xfd -- currently
- * ignored). If timeout is 0, fselect blocks until some file descriptor
- * is ready; otherwise, it waits only "timeout" milliseconds.
- * Return value: number of file descriptors that are available for
- * reading/writing; or a negative error number.
- */
-
- /* helper function for time outs */
- static void
- unselectme(p)
- PROC *p;
- {
- wakeselect((long)p);
- }
-
- long ARGS_ON_STACK
- f_select(timeout, rfdp, wfdp, xfdp)
- unsigned timeout;
- long *rfdp, *wfdp, *xfdp;
- {
- long rfd, wfd;
- long mask, bytes;
- int i, count;
- FILEPTR *f;
- PROC *p;
- TIMEOUT *t;
- short sr;
-
- if (xfdp)
- *xfdp = 0;
-
- if (rfdp) {
- rfd = *rfdp; *rfdp = 0;
- }
- else
- rfd = 0;
- if (wfdp) {
- wfd = *wfdp; *wfdp = 0;
- }
- else
- wfd = 0;
-
- TRACE(("Fselect(%u, %lx, %lx)", timeout, rfd, wfd));
- p = curproc; /* help the optimizer out */
-
- /* first, validate the masks */
- mask = 1L;
- for (i = 0; i < MAX_OPEN; i++) {
- if ( ((rfd & mask) || (wfd & mask)) && !(p->handle[i]) ) {
- DEBUG(("Fselect: invalid handle: %d", i));
- return EIHNDL;
- }
- mask = mask << 1L;
- }
-
- /* now, loop through the file descriptors, setting up the select process */
- /* NOTE: wakeselect will set p->wait_cond to 0 if data arrives during the
- * selection
- * Also note: because of the validation above, we may assume that the
- * file handles are valid here. However, this assumption may no longer
- * be true after we've gone to sleep, since a signal handler may have
- * closed one of the handles.
- */
-
- mask = 1L;
- count = 0;
- curproc->wait_cond = (long)wakeselect; /* flag */
-
- for (i = 0; i < MAX_OPEN; i++) {
- if (rfd & mask) {
- f = p->handle[i];
- if ((*f->dev->select)(f, (long)p, O_RDONLY) == 1) {
- count++;
- *rfdp |= mask;
- }
- }
- if (wfd & mask) {
- f = p->handle[i];
- if ((*f->dev->select)(f, (long)p, O_WRONLY) == 1) {
- count++;
- *wfdp |= mask;
- }
- }
- mask = mask << 1L;
- }
-
- if (count == 0) {
- /* OK, now let's set a timeout */
-
- if (timeout) {
- t = addtimeout((long)timeout, unselectme);
- } else {
- t = 0;
- }
-
- sr = spl7();
-
- /* curproc->wait_cond changes when data arrives or the timeout happens */
- while (curproc->wait_cond == (long)wakeselect) {
- TRACE(("sleeping in Fselect"));
- sleep(SELECT_Q, (long)wakeselect);
- }
- spl(sr);
-
- /* we can cancel the time out now (if it hasn't already happened) */
- if (t) canceltimeout(t);
-
- /* OK, let's see what data arrived (if any) */
- mask = 1L;
- for (i = 0; i < MAX_OPEN; i++) {
- if (rfd & mask) {
- f = p->handle[i];
- if (f) {
- bytes = 1L;
- (void)(*f->dev->ioctl)(f, FIONREAD,&bytes);
- if (bytes > 0) {
- *rfdp |= mask;
- count++;
- }
- }
- }
- if (wfd & mask) {
- f = p->handle[i];
- if (f) {
- bytes = 1L;
- (void)(*f->dev->ioctl)(f, FIONWRITE,&bytes);
- if (bytes > 0) {
- *wfdp |= mask;
- count++;
- }
- }
- }
- mask = mask << 1L;
- }
- }
-
- /* at this point, we either have data or a time out */
- /* cancel all the selects */
- mask = 1L;
-
- for (i = 0; i < MAX_OPEN; i++) {
- if (rfd & mask) {
- f = p->handle[i];
- if (f)
- (*f->dev->unselect)(f, (long)p, O_RDONLY);
- }
- if (wfd & mask) {
- f = p->handle[i];
- if (f)
- (*f->dev->unselect)(f, (long)p, O_WRONLY);
- }
- mask = mask << 1L;
- }
-
- TRACE(("Fselect: returning %d", count));
- return count;
- }
-
-
- /*
- * GEMDOS extension: Fmidipipe
- * Fmidipipe(pid, in, out) manipultes the MIDI file handles (handles -4 and -5)
- * of process "pid" so that they now point to the files with handles "in" and
- * "out" in the calling process
- */
-
- long ARGS_ON_STACK
- f_midipipe(pid, in, out)
- int pid, in, out;
- {
- PROC *p;
- FILEPTR *fin, *fout;
-
- /* first, find the process */
-
- if (pid == 0)
- p = curproc;
- else {
- p = pid2proc(pid);
- if (!p)
- return EFILNF;
- }
-
- /* next, validate the input and output file handles */
- if (in < MIN_HANDLE || in >= MAX_OPEN || (0==(fin = curproc->handle[in])))
- return EIHNDL;
- if ( (fin->flags & O_RWMODE) == O_WRONLY ) {
- DEBUG(("Fmidipipe: input side is write only"));
- return EACCDN;
- }
- if (out < MIN_HANDLE || out >= MAX_OPEN || (0==(fout = curproc->handle[out])))
- return EIHNDL;
- if ( (fout->flags & O_RWMODE) == O_RDONLY ) {
- DEBUG(("Fmidipipe: output side is read only"));
- return EACCDN;
- }
-
- /* OK, duplicate the handles and put them in the new process */
- fin->links++; fout->links++;
- (void)do_pclose(p, p->midiin);
- (void)do_pclose(p, p->midiout);
- p->midiin = fin; p->midiout = fout;
- return 0;
- }
-