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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
78ed81a3 | 33 | * from: @(#)kern_descrip.c 7.28 (Berkeley) 6/25/91 |
34 | * $Id$ | |
15637ed4 | 35 | */ |
15637ed4 RG |
36 | |
37 | #include "param.h" | |
38 | #include "systm.h" | |
39 | #include "filedesc.h" | |
40 | #include "kernel.h" | |
41 | #include "vnode.h" | |
42 | #include "proc.h" | |
43 | #include "file.h" | |
44 | #include "socket.h" | |
45 | #include "socketvar.h" | |
46 | #include "stat.h" | |
47 | #include "ioctl.h" | |
48 | #include "fcntl.h" | |
49 | #include "malloc.h" | |
50 | #include "syslog.h" | |
51 | #include "resourcevar.h" | |
52 | ||
53 | /* | |
54 | * Descriptor management. | |
55 | */ | |
56 | struct file *filehead; /* head of list of open files */ | |
57 | int nfiles; /* actual number of open files */ | |
78ed81a3 | 58 | extern int maxfdescs; /* maximum number of file descriptors to a process */ |
15637ed4 RG |
59 | |
60 | /* | |
61 | * System calls on descriptors. | |
62 | */ | |
63 | /* ARGSUSED */ | |
64 | getdtablesize(p, uap, retval) | |
65 | struct proc *p; | |
66 | struct args *uap; | |
67 | int *retval; | |
68 | { | |
69 | ||
70 | *retval = p->p_rlimit[RLIMIT_OFILE].rlim_cur; | |
71 | return (0); | |
72 | } | |
73 | ||
74 | /* | |
75 | * Duplicate a file descriptor. | |
76 | */ | |
78ed81a3 | 77 | |
78 | struct dup_args { | |
79 | int i; | |
80 | }; | |
81 | ||
15637ed4 RG |
82 | /* ARGSUSED */ |
83 | dup(p, uap, retval) | |
84 | struct proc *p; | |
78ed81a3 | 85 | struct dup_args *uap; |
15637ed4 RG |
86 | int *retval; |
87 | { | |
88 | register struct filedesc *fdp = p->p_fd; | |
89 | struct file *fp; | |
90 | int fd, error; | |
91 | ||
92 | /* | |
93 | * XXX Compatibility | |
94 | */ | |
95 | if (uap->i &~ 077) { uap->i &= 077; return (dup2(p, uap, retval)); } | |
96 | ||
97 | if ((unsigned)uap->i >= fdp->fd_nfiles || | |
98 | (fp = fdp->fd_ofiles[uap->i]) == NULL) | |
99 | return (EBADF); | |
100 | if (error = fdalloc(p, 0, &fd)) | |
101 | return (error); | |
102 | fdp->fd_ofiles[fd] = fp; | |
103 | fdp->fd_ofileflags[fd] = fdp->fd_ofileflags[uap->i] &~ UF_EXCLOSE; | |
104 | fp->f_count++; | |
105 | if (fd > fdp->fd_lastfile) | |
106 | fdp->fd_lastfile = fd; | |
107 | *retval = fd; | |
108 | return (0); | |
109 | } | |
110 | ||
111 | /* | |
112 | * Duplicate a file descriptor to a particular value. | |
113 | */ | |
78ed81a3 | 114 | |
115 | struct dup2_args { | |
116 | u_int from; | |
117 | u_int to; | |
118 | }; | |
119 | ||
15637ed4 RG |
120 | /* ARGSUSED */ |
121 | dup2(p, uap, retval) | |
122 | struct proc *p; | |
78ed81a3 | 123 | struct dup2_args *uap; |
15637ed4 RG |
124 | int *retval; |
125 | { | |
126 | register struct filedesc *fdp = p->p_fd; | |
127 | register struct file *fp; | |
128 | register u_int old = uap->from, new = uap->to; | |
129 | int i, error; | |
130 | ||
131 | if (old >= fdp->fd_nfiles || | |
132 | (fp = fdp->fd_ofiles[old]) == NULL || | |
78ed81a3 | 133 | new >= p->p_rlimit[RLIMIT_OFILE].rlim_cur || |
134 | new >= maxfdescs) | |
15637ed4 RG |
135 | return (EBADF); |
136 | *retval = new; | |
137 | if (old == new) | |
138 | return (0); | |
139 | if (new >= fdp->fd_nfiles) { | |
140 | if (error = fdalloc(p, new, &i)) | |
141 | return (error); | |
142 | if (new != i) | |
143 | panic("dup2: fdalloc"); | |
144 | } else if (fdp->fd_ofiles[new]) { | |
145 | if (fdp->fd_ofileflags[new] & UF_MAPPED) | |
146 | (void) munmapfd(p, new); | |
147 | /* | |
148 | * dup2() must succeed even if the close has an error. | |
149 | */ | |
150 | (void) closef(fdp->fd_ofiles[new], p); | |
151 | } | |
152 | fdp->fd_ofiles[new] = fp; | |
153 | fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] &~ UF_EXCLOSE; | |
154 | fp->f_count++; | |
155 | if (new > fdp->fd_lastfile) | |
156 | fdp->fd_lastfile = new; | |
157 | return (0); | |
158 | } | |
159 | ||
160 | /* | |
161 | * The file control system call. | |
162 | */ | |
78ed81a3 | 163 | |
164 | struct fcntl_args { | |
165 | int fd; | |
166 | int cmd; | |
167 | int arg; | |
168 | }; | |
169 | ||
15637ed4 RG |
170 | /* ARGSUSED */ |
171 | fcntl(p, uap, retval) | |
172 | struct proc *p; | |
78ed81a3 | 173 | register struct fcntl_args *uap; |
15637ed4 RG |
174 | int *retval; |
175 | { | |
176 | register struct filedesc *fdp = p->p_fd; | |
177 | register struct file *fp; | |
178 | register char *pop; | |
179 | struct vnode *vp; | |
180 | int i, tmp, error, flg = F_POSIX; | |
181 | struct flock fl; | |
182 | ||
183 | if ((unsigned)uap->fd >= fdp->fd_nfiles || | |
184 | (fp = fdp->fd_ofiles[uap->fd]) == NULL) | |
185 | return (EBADF); | |
186 | pop = &fdp->fd_ofileflags[uap->fd]; | |
187 | switch(uap->cmd) { | |
188 | case F_DUPFD: | |
78ed81a3 | 189 | if ((unsigned)uap->arg >= p->p_rlimit[RLIMIT_OFILE].rlim_cur || |
190 | ((unsigned)uap->arg >= maxfdescs)) | |
15637ed4 RG |
191 | return (EINVAL); |
192 | if (error = fdalloc(p, uap->arg, &i)) | |
193 | return (error); | |
194 | fdp->fd_ofiles[i] = fp; | |
195 | fdp->fd_ofileflags[i] = *pop &~ UF_EXCLOSE; | |
196 | fp->f_count++; | |
197 | if (i > fdp->fd_lastfile) | |
198 | fdp->fd_lastfile = i; | |
199 | *retval = i; | |
200 | return (0); | |
201 | ||
202 | case F_GETFD: | |
203 | *retval = *pop & 1; | |
204 | return (0); | |
205 | ||
206 | case F_SETFD: | |
207 | *pop = (*pop &~ 1) | (uap->arg & 1); | |
208 | return (0); | |
209 | ||
210 | case F_GETFL: | |
211 | *retval = OFLAGS(fp->f_flag); | |
212 | return (0); | |
213 | ||
214 | case F_SETFL: | |
215 | fp->f_flag &= ~FCNTLFLAGS; | |
216 | fp->f_flag |= FFLAGS(uap->arg) & FCNTLFLAGS; | |
217 | tmp = fp->f_flag & FNONBLOCK; | |
218 | error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p); | |
219 | if (error) | |
220 | return (error); | |
221 | tmp = fp->f_flag & FASYNC; | |
222 | error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, (caddr_t)&tmp, p); | |
223 | if (!error) | |
224 | return (0); | |
225 | fp->f_flag &= ~FNONBLOCK; | |
226 | tmp = 0; | |
227 | (void) (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p); | |
228 | return (error); | |
229 | ||
230 | case F_GETOWN: | |
231 | if (fp->f_type == DTYPE_SOCKET) { | |
232 | *retval = ((struct socket *)fp->f_data)->so_pgid; | |
233 | return (0); | |
234 | } | |
235 | error = (*fp->f_ops->fo_ioctl) | |
236 | (fp, (int)TIOCGPGRP, (caddr_t)retval, p); | |
237 | *retval = -*retval; | |
238 | return (error); | |
239 | ||
240 | case F_SETOWN: | |
241 | if (fp->f_type == DTYPE_SOCKET) { | |
242 | ((struct socket *)fp->f_data)->so_pgid = uap->arg; | |
243 | return (0); | |
244 | } | |
245 | if (uap->arg <= 0) { | |
246 | uap->arg = -uap->arg; | |
247 | } else { | |
248 | struct proc *p1 = pfind(uap->arg); | |
249 | if (p1 == 0) | |
250 | return (ESRCH); | |
251 | uap->arg = p1->p_pgrp->pg_id; | |
252 | } | |
253 | return ((*fp->f_ops->fo_ioctl) | |
254 | (fp, (int)TIOCSPGRP, (caddr_t)&uap->arg, p)); | |
255 | ||
256 | case F_SETLKW: | |
257 | flg |= F_WAIT; | |
258 | /* Fall into F_SETLK */ | |
259 | ||
260 | case F_SETLK: | |
261 | if (fp->f_type != DTYPE_VNODE) | |
262 | return (EBADF); | |
263 | vp = (struct vnode *)fp->f_data; | |
264 | /* Copy in the lock structure */ | |
265 | error = copyin((caddr_t)uap->arg, (caddr_t)&fl, sizeof (fl)); | |
266 | if (error) | |
267 | return (error); | |
268 | if (fl.l_whence == SEEK_CUR) | |
269 | fl.l_start += fp->f_offset; | |
270 | switch (fl.l_type) { | |
271 | ||
272 | case F_RDLCK: | |
273 | if ((fp->f_flag & FREAD) == 0) | |
274 | return (EBADF); | |
275 | p->p_flag |= SADVLCK; | |
276 | return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg)); | |
277 | ||
278 | case F_WRLCK: | |
279 | if ((fp->f_flag & FWRITE) == 0) | |
280 | return (EBADF); | |
281 | p->p_flag |= SADVLCK; | |
282 | return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg)); | |
283 | ||
284 | case F_UNLCK: | |
285 | return (VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &fl, | |
286 | F_POSIX)); | |
287 | ||
288 | default: | |
289 | return (EINVAL); | |
290 | } | |
291 | ||
292 | case F_GETLK: | |
293 | if (fp->f_type != DTYPE_VNODE) | |
294 | return (EBADF); | |
295 | vp = (struct vnode *)fp->f_data; | |
296 | /* Copy in the lock structure */ | |
297 | error = copyin((caddr_t)uap->arg, (caddr_t)&fl, sizeof (fl)); | |
298 | if (error) | |
299 | return (error); | |
300 | if (fl.l_whence == SEEK_CUR) | |
301 | fl.l_start += fp->f_offset; | |
302 | if (error = VOP_ADVLOCK(vp, (caddr_t)p, F_GETLK, &fl, F_POSIX)) | |
303 | return (error); | |
304 | return (copyout((caddr_t)&fl, (caddr_t)uap->arg, sizeof (fl))); | |
305 | ||
306 | default: | |
307 | return (EINVAL); | |
308 | } | |
309 | /* NOTREACHED */ | |
310 | } | |
311 | ||
312 | /* | |
313 | * Close a file descriptor. | |
314 | */ | |
315 | /* ARGSUSED */ | |
78ed81a3 | 316 | struct close_args { |
317 | int fd; | |
318 | }; | |
319 | ||
15637ed4 RG |
320 | close(p, uap, retval) |
321 | struct proc *p; | |
78ed81a3 | 322 | struct close_args *uap; |
15637ed4 RG |
323 | int *retval; |
324 | { | |
325 | register struct filedesc *fdp = p->p_fd; | |
326 | register struct file *fp; | |
327 | register int fd = uap->fd; | |
328 | register u_char *pf; | |
329 | ||
330 | if ((unsigned)fd >= fdp->fd_nfiles || | |
331 | (fp = fdp->fd_ofiles[fd]) == NULL) | |
332 | return (EBADF); | |
333 | pf = (u_char *)&fdp->fd_ofileflags[fd]; | |
334 | if (*pf & UF_MAPPED) | |
335 | (void) munmapfd(p, fd); | |
336 | fdp->fd_ofiles[fd] = NULL; | |
337 | while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL) | |
338 | fdp->fd_lastfile--; | |
339 | if (fd < fdp->fd_freefile) | |
340 | fdp->fd_freefile = fd; | |
341 | *pf = 0; | |
342 | return (closef(fp, p)); | |
343 | } | |
344 | ||
345 | /* | |
346 | * Return status information about a file descriptor. | |
347 | */ | |
78ed81a3 | 348 | |
349 | struct fstat_args { | |
350 | int fd; | |
351 | struct stat *sb; | |
352 | }; | |
353 | ||
15637ed4 RG |
354 | /* ARGSUSED */ |
355 | fstat(p, uap, retval) | |
356 | struct proc *p; | |
78ed81a3 | 357 | register struct fstat_args *uap; |
15637ed4 RG |
358 | int *retval; |
359 | { | |
360 | register struct filedesc *fdp = p->p_fd; | |
361 | register struct file *fp; | |
362 | struct stat ub; | |
363 | int error; | |
364 | ||
365 | if ((unsigned)uap->fd >= fdp->fd_nfiles || | |
366 | (fp = fdp->fd_ofiles[uap->fd]) == NULL) | |
367 | return (EBADF); | |
368 | switch (fp->f_type) { | |
369 | ||
370 | case DTYPE_VNODE: | |
371 | error = vn_stat((struct vnode *)fp->f_data, &ub, p); | |
372 | break; | |
373 | ||
374 | case DTYPE_SOCKET: | |
375 | error = soo_stat((struct socket *)fp->f_data, &ub); | |
376 | break; | |
377 | ||
378 | default: | |
379 | panic("fstat"); | |
380 | /*NOTREACHED*/ | |
381 | } | |
382 | if (error == 0) | |
383 | error = copyout((caddr_t)&ub, (caddr_t)uap->sb, sizeof (ub)); | |
384 | return (error); | |
385 | } | |
386 | ||
387 | /* | |
388 | * Allocate a file descriptor for the process. | |
389 | */ | |
390 | int fdexpand; | |
391 | ||
392 | fdalloc(p, want, result) | |
393 | struct proc *p; | |
394 | int want; | |
395 | int *result; | |
396 | { | |
397 | register struct filedesc *fdp = p->p_fd; | |
398 | register int i; | |
399 | int lim, last, nfiles; | |
400 | struct file **newofile; | |
401 | char *newofileflags; | |
402 | ||
403 | /* | |
404 | * Search for a free descriptor starting at the higher | |
405 | * of want or fd_freefile. If that fails, consider | |
406 | * expanding the ofile array. | |
407 | */ | |
408 | lim = p->p_rlimit[RLIMIT_OFILE].rlim_cur; | |
409 | for (;;) { | |
410 | last = min(fdp->fd_nfiles, lim); | |
411 | if ((i = want) < fdp->fd_freefile) | |
412 | i = fdp->fd_freefile; | |
413 | for (; i < last; i++) { | |
414 | if (fdp->fd_ofiles[i] == NULL) { | |
415 | fdp->fd_ofileflags[i] = 0; | |
416 | if (i > fdp->fd_lastfile) | |
417 | fdp->fd_lastfile = i; | |
418 | if (want <= fdp->fd_freefile) | |
419 | fdp->fd_freefile = i; | |
420 | *result = i; | |
421 | return (0); | |
422 | } | |
423 | } | |
424 | ||
425 | /* | |
426 | * No space in current array. Expand? | |
427 | */ | |
428 | if (fdp->fd_nfiles >= lim) | |
429 | return (EMFILE); | |
430 | if (fdp->fd_nfiles < NDEXTENT) | |
431 | nfiles = NDEXTENT; | |
432 | else | |
433 | nfiles = 2 * fdp->fd_nfiles; | |
434 | MALLOC(newofile, struct file **, nfiles * OFILESIZE, | |
435 | M_FILEDESC, M_WAITOK); | |
436 | newofileflags = (char *) &newofile[nfiles]; | |
437 | /* | |
438 | * Copy the existing ofile and ofileflags arrays | |
439 | * and zero the new portion of each array. | |
440 | */ | |
441 | bcopy(fdp->fd_ofiles, newofile, | |
442 | (i = sizeof(struct file *) * fdp->fd_nfiles)); | |
443 | bzero((char *)newofile + i, nfiles * sizeof(struct file *) - i); | |
444 | bcopy(fdp->fd_ofileflags, newofileflags, | |
445 | (i = sizeof(char) * fdp->fd_nfiles)); | |
446 | bzero(newofileflags + i, nfiles * sizeof(char) - i); | |
447 | if (fdp->fd_nfiles > NDFILE) | |
448 | FREE(fdp->fd_ofiles, M_FILEDESC); | |
449 | fdp->fd_ofiles = newofile; | |
450 | fdp->fd_ofileflags = newofileflags; | |
451 | fdp->fd_nfiles = nfiles; | |
452 | fdexpand++; | |
453 | } | |
454 | } | |
455 | ||
456 | /* | |
457 | * Check to see whether n user file descriptors | |
458 | * are available to the process p. | |
459 | */ | |
460 | fdavail(p, n) | |
461 | struct proc *p; | |
462 | register int n; | |
463 | { | |
464 | register struct filedesc *fdp = p->p_fd; | |
465 | register struct file **fpp; | |
466 | register int i; | |
467 | ||
468 | if ((i = p->p_rlimit[RLIMIT_OFILE].rlim_cur - fdp->fd_nfiles) > 0 && | |
469 | (n -= i) <= 0) | |
470 | return (1); | |
471 | fpp = &fdp->fd_ofiles[fdp->fd_freefile]; | |
472 | for (i = fdp->fd_nfiles - fdp->fd_freefile; --i >= 0; fpp++) | |
473 | if (*fpp == NULL && --n <= 0) | |
474 | return (1); | |
475 | return (0); | |
476 | } | |
477 | ||
478 | /* | |
479 | * Create a new open file structure and allocate | |
480 | * a file decriptor for the process that refers to it. | |
481 | */ | |
482 | falloc(p, resultfp, resultfd) | |
483 | register struct proc *p; | |
484 | struct file **resultfp; | |
485 | int *resultfd; | |
486 | { | |
487 | register struct file *fp, *fq, **fpp; | |
488 | int error, i; | |
489 | ||
490 | if (error = fdalloc(p, 0, &i)) | |
491 | return (error); | |
492 | if (nfiles >= maxfiles) { | |
493 | tablefull("file"); | |
494 | return (ENFILE); | |
495 | } | |
496 | /* | |
497 | * Allocate a new file descriptor. | |
498 | * If the process has file descriptor zero open, add to the list | |
499 | * of open files at that point, otherwise put it at the front of | |
500 | * the list of open files. | |
501 | */ | |
502 | nfiles++; | |
503 | MALLOC(fp, struct file *, sizeof(struct file), M_FILE, M_WAITOK); | |
504 | if (fq = p->p_fd->fd_ofiles[0]) | |
505 | fpp = &fq->f_filef; | |
506 | else | |
507 | fpp = &filehead; | |
508 | p->p_fd->fd_ofiles[i] = fp; | |
509 | if (fq = *fpp) | |
510 | fq->f_fileb = &fp->f_filef; | |
511 | fp->f_filef = fq; | |
512 | fp->f_fileb = fpp; | |
513 | *fpp = fp; | |
514 | fp->f_count = 1; | |
515 | fp->f_msgcount = 0; | |
516 | fp->f_offset = 0; | |
517 | fp->f_cred = p->p_ucred; | |
518 | crhold(fp->f_cred); | |
519 | if (resultfp) | |
520 | *resultfp = fp; | |
521 | if (resultfd) | |
522 | *resultfd = i; | |
523 | return (0); | |
524 | } | |
525 | ||
526 | /* | |
527 | * Free a file descriptor. | |
528 | */ | |
529 | ffree(fp) | |
530 | register struct file *fp; | |
531 | { | |
532 | register struct file *fq; | |
533 | ||
534 | if (fq = fp->f_filef) | |
535 | fq->f_fileb = fp->f_fileb; | |
536 | *fp->f_fileb = fq; | |
537 | crfree(fp->f_cred); | |
538 | #ifdef DIAGNOSTIC | |
539 | fp->f_filef = NULL; | |
540 | fp->f_fileb = NULL; | |
541 | fp->f_count = 0; | |
542 | #endif | |
543 | nfiles--; | |
544 | FREE(fp, M_FILE); | |
545 | } | |
546 | ||
547 | /* | |
548 | * Copy a filedesc structure. | |
549 | */ | |
550 | struct filedesc * | |
551 | fdcopy(p) | |
552 | struct proc *p; | |
553 | { | |
554 | register struct filedesc *newfdp, *fdp = p->p_fd; | |
555 | register struct file **fpp; | |
556 | register int i; | |
557 | ||
558 | MALLOC(newfdp, struct filedesc *, sizeof(struct filedesc0), | |
559 | M_FILEDESC, M_WAITOK); | |
560 | bcopy(fdp, newfdp, sizeof(struct filedesc)); | |
561 | VREF(newfdp->fd_cdir); | |
562 | if (newfdp->fd_rdir) | |
563 | VREF(newfdp->fd_rdir); | |
564 | newfdp->fd_refcnt = 1; | |
565 | ||
566 | /* | |
567 | * If the number of open files fits in the internal arrays | |
568 | * of the open file structure, use them, otherwise allocate | |
569 | * additional memory for the number of descriptors currently | |
570 | * in use. | |
571 | */ | |
572 | if (newfdp->fd_lastfile < NDFILE) { | |
573 | newfdp->fd_ofiles = ((struct filedesc0 *) newfdp)->fd_dfiles; | |
574 | newfdp->fd_ofileflags = | |
575 | ((struct filedesc0 *) newfdp)->fd_dfileflags; | |
576 | i = NDFILE; | |
577 | } else { | |
578 | /* | |
579 | * Compute the smallest multiple of NDEXTENT needed | |
580 | * for the file descriptors currently in use, | |
581 | * allowing the table to shrink. | |
582 | */ | |
583 | i = newfdp->fd_nfiles; | |
584 | while (i > 2 * NDEXTENT && i >= newfdp->fd_lastfile * 2) | |
585 | i /= 2; | |
586 | MALLOC(newfdp->fd_ofiles, struct file **, i * OFILESIZE, | |
587 | M_FILEDESC, M_WAITOK); | |
588 | newfdp->fd_ofileflags = (char *) &newfdp->fd_ofiles[i]; | |
589 | } | |
590 | newfdp->fd_nfiles = i; | |
591 | bcopy(fdp->fd_ofiles, newfdp->fd_ofiles, i * sizeof(struct file **)); | |
592 | bcopy(fdp->fd_ofileflags, newfdp->fd_ofileflags, i * sizeof(char)); | |
593 | fpp = newfdp->fd_ofiles; | |
594 | for (i = newfdp->fd_lastfile; i-- >= 0; fpp++) | |
595 | if (*fpp != NULL) | |
596 | (*fpp)->f_count++; | |
597 | return (newfdp); | |
598 | } | |
599 | ||
600 | /* | |
601 | * Release a filedesc structure. | |
602 | */ | |
603 | void | |
604 | fdfree(p) | |
605 | struct proc *p; | |
606 | { | |
607 | register struct filedesc *fdp = p->p_fd; | |
608 | struct file **fpp; | |
609 | char *fdfp; | |
610 | register int i; | |
611 | ||
612 | if (--fdp->fd_refcnt > 0) | |
613 | return; | |
614 | fpp = fdp->fd_ofiles; | |
615 | fdfp = fdp->fd_ofileflags; | |
616 | for (i = 0; i <= fdp->fd_lastfile; i++, fpp++, fdfp++) | |
617 | if (*fpp != NULL) { | |
618 | if (*fdfp & UF_MAPPED) | |
619 | (void) munmapfd(p, i); | |
620 | (void) closef(*fpp, p); | |
621 | } | |
622 | if (fdp->fd_nfiles > NDFILE) | |
623 | FREE(fdp->fd_ofiles, M_FILEDESC); | |
624 | vrele(fdp->fd_cdir); | |
625 | if (fdp->fd_rdir) | |
626 | vrele(fdp->fd_rdir); | |
627 | FREE(fdp, M_FILEDESC); | |
628 | } | |
629 | ||
630 | /* | |
631 | * Close any files on exec? | |
632 | */ | |
633 | void | |
634 | fdcloseexec(p) | |
635 | struct proc *p; | |
636 | { | |
637 | struct filedesc *fdp = p->p_fd; | |
638 | struct file **fpp; | |
639 | char *fdfp; | |
640 | register int i; | |
641 | ||
642 | fpp = fdp->fd_ofiles; | |
643 | fdfp = fdp->fd_ofileflags; | |
644 | for (i = 0; i <= fdp->fd_lastfile; i++, fpp++, fdfp++) | |
645 | if (*fpp != NULL && (*fdfp & UF_EXCLOSE)) { | |
646 | if (*fdfp & UF_MAPPED) | |
647 | (void) munmapfd(p, i); | |
648 | (void) closef(*fpp, p); | |
649 | *fpp = NULL; | |
650 | *fdfp = 0; | |
651 | if (i < fdp->fd_freefile) | |
652 | fdp->fd_freefile = i; | |
653 | } | |
654 | while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL) | |
655 | fdp->fd_lastfile--; | |
656 | } | |
657 | ||
658 | /* | |
659 | * Internal form of close. | |
660 | * Decrement reference count on file structure. | |
661 | */ | |
662 | closef(fp, p) | |
663 | register struct file *fp; | |
664 | register struct proc *p; | |
665 | { | |
666 | struct vnode *vp; | |
667 | struct flock lf; | |
668 | int error; | |
669 | ||
670 | if (fp == NULL) | |
671 | return (0); | |
672 | /* | |
673 | * POSIX record locking dictates that any close releases ALL | |
674 | * locks owned by this process. This is handled by setting | |
675 | * a flag in the unlock to free ONLY locks obeying POSIX | |
676 | * semantics, and not to free BSD-style file locks. | |
677 | */ | |
678 | if ((p->p_flag & SADVLCK) && fp->f_type == DTYPE_VNODE) { | |
679 | lf.l_whence = SEEK_SET; | |
680 | lf.l_start = 0; | |
681 | lf.l_len = 0; | |
682 | lf.l_type = F_UNLCK; | |
683 | vp = (struct vnode *)fp->f_data; | |
684 | (void) VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_POSIX); | |
685 | } | |
686 | if (--fp->f_count > 0) | |
687 | return (0); | |
688 | if (fp->f_count < 0) | |
689 | panic("closef: count < 0"); | |
690 | if ((fp->f_flag & FHASLOCK) && fp->f_type == DTYPE_VNODE) { | |
691 | lf.l_whence = SEEK_SET; | |
692 | lf.l_start = 0; | |
693 | lf.l_len = 0; | |
694 | lf.l_type = F_UNLCK; | |
695 | vp = (struct vnode *)fp->f_data; | |
696 | (void) VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK); | |
697 | } | |
698 | error = (*fp->f_ops->fo_close)(fp, p); | |
699 | ffree(fp); | |
700 | return (error); | |
701 | } | |
702 | ||
703 | /* | |
704 | * Apply an advisory lock on a file descriptor. | |
705 | * | |
706 | * Just attempt to get a record lock of the requested type on | |
707 | * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0). | |
708 | */ | |
709 | ||
78ed81a3 | 710 | struct flock_args { |
711 | int fd; | |
712 | int how; | |
713 | }; | |
714 | ||
15637ed4 RG |
715 | /* ARGSUSED */ |
716 | flock(p, uap, retval) | |
717 | struct proc *p; | |
78ed81a3 | 718 | register struct flock_args *uap; |
15637ed4 RG |
719 | int *retval; |
720 | { | |
721 | register struct filedesc *fdp = p->p_fd; | |
722 | register struct file *fp; | |
723 | struct vnode *vp; | |
724 | struct flock lf; | |
725 | int error; | |
726 | ||
727 | if ((unsigned)uap->fd >= fdp->fd_nfiles || | |
728 | (fp = fdp->fd_ofiles[uap->fd]) == NULL) | |
729 | return (EBADF); | |
730 | if (fp->f_type != DTYPE_VNODE) | |
731 | return (EOPNOTSUPP); | |
732 | vp = (struct vnode *)fp->f_data; | |
733 | lf.l_whence = SEEK_SET; | |
734 | lf.l_start = 0; | |
735 | lf.l_len = 0; | |
736 | if (uap->how & LOCK_UN) { | |
737 | lf.l_type = F_UNLCK; | |
738 | fp->f_flag &= ~FHASLOCK; | |
739 | return (VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK)); | |
740 | } | |
741 | if (uap->how & LOCK_EX) | |
742 | lf.l_type = F_WRLCK; | |
743 | else if (uap->how & LOCK_SH) | |
744 | lf.l_type = F_RDLCK; | |
745 | else | |
746 | return (EBADF); | |
747 | fp->f_flag |= FHASLOCK; | |
748 | if (uap->how & LOCK_NB) | |
749 | return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK)); | |
750 | return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK|F_WAIT)); | |
751 | } | |
752 | ||
753 | /* | |
754 | * File Descriptor pseudo-device driver (/dev/fd/). | |
755 | * | |
756 | * Opening minor device N dup()s the file (if any) connected to file | |
757 | * descriptor N belonging to the calling process. Note that this driver | |
758 | * consists of only the ``open()'' routine, because all subsequent | |
759 | * references to this file will be direct to the other driver. | |
760 | */ | |
761 | /* ARGSUSED */ | |
762 | fdopen(dev, mode, type) | |
763 | dev_t dev; | |
764 | int mode, type; | |
765 | { | |
766 | ||
767 | /* | |
768 | * XXX Kludge: set curproc->p_dupfd to contain the value of the | |
769 | * the file descriptor being sought for duplication. The error | |
770 | * return ensures that the vnode for this device will be released | |
771 | * by vn_open. Open will detect this special error and take the | |
772 | * actions in dupfdopen below. Other callers of vn_open or VOP_OPEN | |
773 | * will simply report the error. | |
774 | */ | |
775 | curproc->p_dupfd = minor(dev); /* XXX */ | |
776 | return (ENODEV); | |
777 | } | |
778 | ||
779 | /* | |
780 | * Duplicate the specified descriptor to a free descriptor. | |
781 | */ | |
782 | dupfdopen(fdp, indx, dfd, mode) | |
783 | register struct filedesc *fdp; | |
784 | register int indx, dfd; | |
785 | int mode; | |
786 | { | |
787 | register struct file *wfp; | |
788 | struct file *fp; | |
789 | ||
790 | /* | |
791 | * If the to-be-dup'd fd number is greater than the allowed number | |
792 | * of file descriptors, or the fd to be dup'd has already been | |
793 | * closed, reject. Note, check for new == old is necessary as | |
794 | * falloc could allocate an already closed to-be-dup'd descriptor | |
795 | * as the new descriptor. | |
796 | */ | |
797 | fp = fdp->fd_ofiles[indx]; | |
798 | if ((u_int)dfd >= fdp->fd_nfiles || | |
799 | (wfp = fdp->fd_ofiles[dfd]) == NULL || fp == wfp) | |
800 | return (EBADF); | |
801 | ||
802 | /* | |
803 | * Check that the mode the file is being opened for is a subset | |
804 | * of the mode of the existing descriptor. | |
805 | */ | |
806 | if (((mode & (FREAD|FWRITE)) | wfp->f_flag) != wfp->f_flag) | |
807 | return (EACCES); | |
808 | fdp->fd_ofiles[indx] = wfp; | |
809 | fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd]; | |
810 | wfp->f_count++; | |
811 | if (indx > fdp->fd_lastfile) | |
812 | fdp->fd_lastfile = indx; | |
813 | return (0); | |
814 | } |