Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
7ddc4f96 | 2 | * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California. |
c4ec2128 | 3 | * All rights reserved. |
da7c5cc6 | 4 | * |
dbf0c423 | 5 | * %sccs.include.redist.c% |
c4ec2128 | 6 | * |
9e97623a | 7 | * @(#)kern_descrip.c 7.37 (Berkeley) %G% |
da7c5cc6 | 8 | */ |
40056b21 | 9 | |
94368568 JB |
10 | #include "param.h" |
11 | #include "systm.h" | |
5e00df3b | 12 | #include "filedesc.h" |
94368568 | 13 | #include "kernel.h" |
c4ec2128 | 14 | #include "vnode.h" |
94368568 | 15 | #include "proc.h" |
94368568 JB |
16 | #include "file.h" |
17 | #include "socket.h" | |
18 | #include "socketvar.h" | |
94368568 | 19 | #include "stat.h" |
94368568 | 20 | #include "ioctl.h" |
a4128336 | 21 | #include "fcntl.h" |
5e00df3b KM |
22 | #include "malloc.h" |
23 | #include "syslog.h" | |
7ddc4f96 | 24 | #include "resourcevar.h" |
4147b3f6 BJ |
25 | |
26 | /* | |
27 | * Descriptor management. | |
28 | */ | |
c753a490 KM |
29 | struct file *filehead; /* head of list of open files */ |
30 | int nfiles; /* actual number of open files */ | |
4147b3f6 | 31 | |
40056b21 | 32 | /* |
4147b3f6 | 33 | * System calls on descriptors. |
40056b21 | 34 | */ |
d5820a3c CT |
35 | struct getdtablesize_args { |
36 | int dummy; | |
37 | }; | |
a53a698b KM |
38 | /* ARGSUSED */ |
39 | getdtablesize(p, uap, retval) | |
40 | struct proc *p; | |
d5820a3c | 41 | struct getdtablesize_args *uap; |
a53a698b | 42 | int *retval; |
4147b3f6 BJ |
43 | { |
44 | ||
8429d022 | 45 | *retval = p->p_rlimit[RLIMIT_OFILE].rlim_cur; |
d9c2f47f | 46 | return (0); |
4147b3f6 BJ |
47 | } |
48 | ||
a53a698b KM |
49 | /* |
50 | * Duplicate a file descriptor. | |
51 | */ | |
d5820a3c CT |
52 | struct dup_args { |
53 | int i; | |
54 | }; | |
a53a698b KM |
55 | /* ARGSUSED */ |
56 | dup(p, uap, retval) | |
57 | struct proc *p; | |
d5820a3c | 58 | struct dup_args *uap; |
a53a698b KM |
59 | int *retval; |
60 | { | |
5e00df3b | 61 | register struct filedesc *fdp = p->p_fd; |
a81e9a81 | 62 | struct file *fp; |
a53a698b | 63 | int fd, error; |
4147b3f6 | 64 | |
a53a698b KM |
65 | /* |
66 | * XXX Compatibility | |
67 | */ | |
d9c2f47f | 68 | if (uap->i &~ 077) { uap->i &= 077; return (dup2(p, uap, retval)); } |
4147b3f6 | 69 | |
8429d022 | 70 | if ((unsigned)uap->i >= fdp->fd_nfiles || |
7ddc4f96 | 71 | (fp = fdp->fd_ofiles[uap->i]) == NULL) |
d9c2f47f | 72 | return (EBADF); |
8429d022 | 73 | if (error = fdalloc(p, 0, &fd)) |
d9c2f47f | 74 | return (error); |
7ddc4f96 MK |
75 | fdp->fd_ofiles[fd] = fp; |
76 | fdp->fd_ofileflags[fd] = fdp->fd_ofileflags[uap->i] &~ UF_EXCLOSE; | |
a53a698b | 77 | fp->f_count++; |
5e00df3b KM |
78 | if (fd > fdp->fd_lastfile) |
79 | fdp->fd_lastfile = fd; | |
a53a698b | 80 | *retval = fd; |
d9c2f47f | 81 | return (0); |
4147b3f6 BJ |
82 | } |
83 | ||
a53a698b KM |
84 | /* |
85 | * Duplicate a file descriptor to a particular value. | |
86 | */ | |
d5820a3c CT |
87 | struct dup2_args { |
88 | u_int from; | |
89 | u_int to; | |
90 | }; | |
a53a698b KM |
91 | /* ARGSUSED */ |
92 | dup2(p, uap, retval) | |
93 | struct proc *p; | |
d5820a3c | 94 | struct dup2_args *uap; |
a53a698b | 95 | int *retval; |
4147b3f6 | 96 | { |
5e00df3b | 97 | register struct filedesc *fdp = p->p_fd; |
4147b3f6 | 98 | register struct file *fp; |
7ddc4f96 | 99 | register u_int old = uap->from, new = uap->to; |
5e00df3b | 100 | int i, error; |
40056b21 | 101 | |
7ddc4f96 MK |
102 | if (old >= fdp->fd_nfiles || |
103 | (fp = fdp->fd_ofiles[old]) == NULL || | |
104 | new >= p->p_rlimit[RLIMIT_OFILE].rlim_cur) | |
d9c2f47f | 105 | return (EBADF); |
7ddc4f96 MK |
106 | *retval = new; |
107 | if (old == new) | |
d9c2f47f | 108 | return (0); |
7ddc4f96 MK |
109 | if (new >= fdp->fd_nfiles) { |
110 | if (error = fdalloc(p, new, &i)) | |
5e00df3b | 111 | return (error); |
7ddc4f96 | 112 | if (new != i) |
8429d022 | 113 | panic("dup2: fdalloc"); |
7ddc4f96 MK |
114 | } else if (fdp->fd_ofiles[new]) { |
115 | if (fdp->fd_ofileflags[new] & UF_MAPPED) | |
116 | (void) munmapfd(p, new); | |
117 | /* | |
118 | * dup2() must succeed even if the close has an error. | |
119 | */ | |
120 | (void) closef(fdp->fd_ofiles[new], p); | |
4147b3f6 | 121 | } |
7ddc4f96 MK |
122 | fdp->fd_ofiles[new] = fp; |
123 | fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] &~ UF_EXCLOSE; | |
a53a698b | 124 | fp->f_count++; |
7ddc4f96 MK |
125 | if (new > fdp->fd_lastfile) |
126 | fdp->fd_lastfile = new; | |
127 | return (0); | |
a81e9a81 SL |
128 | } |
129 | ||
88a7a62a SL |
130 | /* |
131 | * The file control system call. | |
132 | */ | |
d5820a3c CT |
133 | struct fcntl_args { |
134 | int fd; | |
135 | int cmd; | |
136 | int arg; | |
137 | }; | |
a53a698b KM |
138 | /* ARGSUSED */ |
139 | fcntl(p, uap, retval) | |
140 | struct proc *p; | |
d5820a3c | 141 | register struct fcntl_args *uap; |
a53a698b KM |
142 | int *retval; |
143 | { | |
5e00df3b | 144 | register struct filedesc *fdp = p->p_fd; |
a53a698b | 145 | register struct file *fp; |
88a7a62a | 146 | register char *pop; |
a4128336 | 147 | struct vnode *vp; |
208eb71b | 148 | int i, tmp, error, flg = F_POSIX; |
a4128336 | 149 | struct flock fl; |
4147b3f6 | 150 | |
8429d022 | 151 | if ((unsigned)uap->fd >= fdp->fd_nfiles || |
7ddc4f96 | 152 | (fp = fdp->fd_ofiles[uap->fd]) == NULL) |
d9c2f47f | 153 | return (EBADF); |
7ddc4f96 | 154 | pop = &fdp->fd_ofileflags[uap->fd]; |
88a7a62a | 155 | switch(uap->cmd) { |
85f01bd4 | 156 | case F_DUPFD: |
8429d022 | 157 | if ((unsigned)uap->arg >= p->p_rlimit[RLIMIT_OFILE].rlim_cur) |
d9c2f47f | 158 | return (EINVAL); |
8429d022 | 159 | if (error = fdalloc(p, uap->arg, &i)) |
d9c2f47f | 160 | return (error); |
7ddc4f96 MK |
161 | fdp->fd_ofiles[i] = fp; |
162 | fdp->fd_ofileflags[i] = *pop &~ UF_EXCLOSE; | |
a53a698b | 163 | fp->f_count++; |
5e00df3b KM |
164 | if (i > fdp->fd_lastfile) |
165 | fdp->fd_lastfile = i; | |
a53a698b | 166 | *retval = i; |
d9c2f47f | 167 | return (0); |
12438177 | 168 | |
85f01bd4 | 169 | case F_GETFD: |
a53a698b | 170 | *retval = *pop & 1; |
d9c2f47f | 171 | return (0); |
40056b21 | 172 | |
85f01bd4 | 173 | case F_SETFD: |
88a7a62a | 174 | *pop = (*pop &~ 1) | (uap->arg & 1); |
d9c2f47f | 175 | return (0); |
12438177 | 176 | |
85f01bd4 | 177 | case F_GETFL: |
f474c4c6 | 178 | *retval = OFLAGS(fp->f_flag); |
d9c2f47f | 179 | return (0); |
12438177 | 180 | |
85f01bd4 | 181 | case F_SETFL: |
f474c4c6 MK |
182 | fp->f_flag &= ~FCNTLFLAGS; |
183 | fp->f_flag |= FFLAGS(uap->arg) & FCNTLFLAGS; | |
ff0803f0 | 184 | tmp = fp->f_flag & FNONBLOCK; |
208eb71b KM |
185 | error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p); |
186 | if (error) | |
d9c2f47f | 187 | return (error); |
ff0803f0 | 188 | tmp = fp->f_flag & FASYNC; |
208eb71b KM |
189 | error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, (caddr_t)&tmp, p); |
190 | if (!error) | |
191 | return (0); | |
ff0803f0 | 192 | fp->f_flag &= ~FNONBLOCK; |
208eb71b KM |
193 | tmp = 0; |
194 | (void) (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p); | |
d9c2f47f | 195 | return (error); |
88a7a62a | 196 | |
85f01bd4 | 197 | case F_GETOWN: |
208eb71b KM |
198 | if (fp->f_type == DTYPE_SOCKET) { |
199 | *retval = ((struct socket *)fp->f_data)->so_pgid; | |
200 | return (0); | |
201 | } | |
202 | error = (*fp->f_ops->fo_ioctl) | |
203 | (fp, (int)TIOCGPGRP, (caddr_t)retval, p); | |
204 | *retval = -*retval; | |
205 | return (error); | |
88a7a62a | 206 | |
85f01bd4 | 207 | case F_SETOWN: |
208eb71b KM |
208 | if (fp->f_type == DTYPE_SOCKET) { |
209 | ((struct socket *)fp->f_data)->so_pgid = uap->arg; | |
210 | return (0); | |
211 | } | |
212 | if (uap->arg <= 0) { | |
213 | uap->arg = -uap->arg; | |
214 | } else { | |
215 | struct proc *p1 = pfind(uap->arg); | |
216 | if (p1 == 0) | |
217 | return (ESRCH); | |
218 | uap->arg = p1->p_pgrp->pg_id; | |
219 | } | |
220 | return ((*fp->f_ops->fo_ioctl) | |
221 | (fp, (int)TIOCSPGRP, (caddr_t)&uap->arg, p)); | |
88a7a62a | 222 | |
a4128336 | 223 | case F_SETLKW: |
208eb71b | 224 | flg |= F_WAIT; |
a4128336 KM |
225 | /* Fall into F_SETLK */ |
226 | ||
227 | case F_SETLK: | |
228 | if (fp->f_type != DTYPE_VNODE) | |
229 | return (EBADF); | |
230 | vp = (struct vnode *)fp->f_data; | |
231 | /* Copy in the lock structure */ | |
232 | error = copyin((caddr_t)uap->arg, (caddr_t)&fl, sizeof (fl)); | |
233 | if (error) | |
234 | return (error); | |
235 | if (fl.l_whence == SEEK_CUR) | |
236 | fl.l_start += fp->f_offset; | |
237 | switch (fl.l_type) { | |
238 | ||
239 | case F_RDLCK: | |
240 | if ((fp->f_flag & FREAD) == 0) | |
241 | return (EBADF); | |
9bd5ee04 | 242 | p->p_flag |= SADVLCK; |
208eb71b | 243 | return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg)); |
a4128336 KM |
244 | |
245 | case F_WRLCK: | |
246 | if ((fp->f_flag & FWRITE) == 0) | |
247 | return (EBADF); | |
9bd5ee04 | 248 | p->p_flag |= SADVLCK; |
208eb71b | 249 | return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg)); |
a4128336 KM |
250 | |
251 | case F_UNLCK: | |
208eb71b KM |
252 | return (VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &fl, |
253 | F_POSIX)); | |
a4128336 KM |
254 | |
255 | default: | |
256 | return (EINVAL); | |
257 | } | |
258 | ||
259 | case F_GETLK: | |
260 | if (fp->f_type != DTYPE_VNODE) | |
261 | return (EBADF); | |
262 | vp = (struct vnode *)fp->f_data; | |
263 | /* Copy in the lock structure */ | |
264 | error = copyin((caddr_t)uap->arg, (caddr_t)&fl, sizeof (fl)); | |
265 | if (error) | |
266 | return (error); | |
2975e814 KM |
267 | if (fl.l_whence == SEEK_CUR) |
268 | fl.l_start += fp->f_offset; | |
208eb71b | 269 | if (error = VOP_ADVLOCK(vp, (caddr_t)p, F_GETLK, &fl, F_POSIX)) |
a4128336 KM |
270 | return (error); |
271 | return (copyout((caddr_t)&fl, (caddr_t)uap->arg, sizeof (fl))); | |
272 | ||
88a7a62a | 273 | default: |
d9c2f47f | 274 | return (EINVAL); |
40056b21 | 275 | } |
a53a698b | 276 | /* NOTREACHED */ |
40056b21 BJ |
277 | } |
278 | ||
a53a698b KM |
279 | /* |
280 | * Close a file descriptor. | |
281 | */ | |
d5820a3c CT |
282 | struct close_args { |
283 | int fd; | |
284 | }; | |
a53a698b KM |
285 | /* ARGSUSED */ |
286 | close(p, uap, retval) | |
287 | struct proc *p; | |
d5820a3c | 288 | struct close_args *uap; |
a53a698b KM |
289 | int *retval; |
290 | { | |
5e00df3b | 291 | register struct filedesc *fdp = p->p_fd; |
88a7a62a | 292 | register struct file *fp; |
8429d022 | 293 | register int fd = uap->fd; |
92438dfc | 294 | register u_char *pf; |
3ebb7a40 | 295 | |
8429d022 | 296 | if ((unsigned)fd >= fdp->fd_nfiles || |
7ddc4f96 | 297 | (fp = fdp->fd_ofiles[fd]) == NULL) |
d9c2f47f | 298 | return (EBADF); |
7ddc4f96 | 299 | pf = (u_char *)&fdp->fd_ofileflags[fd]; |
92438dfc | 300 | if (*pf & UF_MAPPED) |
8429d022 | 301 | (void) munmapfd(p, fd); |
7ddc4f96 MK |
302 | fdp->fd_ofiles[fd] = NULL; |
303 | while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL) | |
5e00df3b | 304 | fdp->fd_lastfile--; |
8429d022 MK |
305 | if (fd < fdp->fd_freefile) |
306 | fdp->fd_freefile = fd; | |
92438dfc | 307 | *pf = 0; |
8429d022 | 308 | return (closef(fp, p)); |
92438dfc SL |
309 | } |
310 | ||
0c1cfb60 | 311 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
a53a698b KM |
312 | /* |
313 | * Return status information about a file descriptor. | |
314 | */ | |
d5820a3c CT |
315 | struct ofstat_args { |
316 | int fd; | |
317 | struct ostat *sb; | |
318 | }; | |
a53a698b | 319 | /* ARGSUSED */ |
a5bec772 | 320 | ofstat(p, uap, retval) |
6150798f | 321 | struct proc *p; |
d5820a3c | 322 | register struct ofstat_args *uap; |
6150798f KM |
323 | int *retval; |
324 | { | |
325 | register struct filedesc *fdp = p->p_fd; | |
326 | register struct file *fp; | |
327 | struct stat ub; | |
328 | struct ostat oub; | |
329 | int error; | |
330 | ||
331 | if ((unsigned)uap->fd >= fdp->fd_nfiles || | |
332 | (fp = fdp->fd_ofiles[uap->fd]) == NULL) | |
333 | return (EBADF); | |
334 | switch (fp->f_type) { | |
335 | ||
336 | case DTYPE_VNODE: | |
337 | error = vn_stat((struct vnode *)fp->f_data, &ub, p); | |
338 | break; | |
339 | ||
340 | case DTYPE_SOCKET: | |
341 | error = soo_stat((struct socket *)fp->f_data, &ub); | |
342 | break; | |
343 | ||
344 | default: | |
0c1cfb60 | 345 | panic("ofstat"); |
6150798f KM |
346 | /*NOTREACHED*/ |
347 | } | |
348 | cvtstat(&ub, &oub); | |
349 | if (error == 0) | |
350 | error = copyout((caddr_t)&oub, (caddr_t)uap->sb, sizeof (oub)); | |
351 | return (error); | |
352 | } | |
0c1cfb60 | 353 | #endif /* COMPAT_43 || COMPAT_SUNOS */ |
6150798f KM |
354 | |
355 | /* | |
356 | * Return status information about a file descriptor. | |
357 | */ | |
d5820a3c CT |
358 | struct fstat_args { |
359 | int fd; | |
360 | struct stat *sb; | |
361 | }; | |
6150798f | 362 | /* ARGSUSED */ |
a5bec772 | 363 | fstat(p, uap, retval) |
a53a698b | 364 | struct proc *p; |
d5820a3c | 365 | register struct fstat_args *uap; |
a53a698b KM |
366 | int *retval; |
367 | { | |
5e00df3b | 368 | register struct filedesc *fdp = p->p_fd; |
a53a698b | 369 | register struct file *fp; |
92438dfc | 370 | struct stat ub; |
a53a698b | 371 | int error; |
92438dfc | 372 | |
8429d022 | 373 | if ((unsigned)uap->fd >= fdp->fd_nfiles || |
7ddc4f96 | 374 | (fp = fdp->fd_ofiles[uap->fd]) == NULL) |
d9c2f47f | 375 | return (EBADF); |
92438dfc SL |
376 | switch (fp->f_type) { |
377 | ||
c4ec2128 | 378 | case DTYPE_VNODE: |
208eb71b | 379 | error = vn_stat((struct vnode *)fp->f_data, &ub, p); |
92438dfc SL |
380 | break; |
381 | ||
382 | case DTYPE_SOCKET: | |
a53a698b | 383 | error = soo_stat((struct socket *)fp->f_data, &ub); |
92438dfc SL |
384 | break; |
385 | ||
386 | default: | |
387 | panic("fstat"); | |
388 | /*NOTREACHED*/ | |
389 | } | |
a53a698b KM |
390 | if (error == 0) |
391 | error = copyout((caddr_t)&ub, (caddr_t)uap->sb, sizeof (ub)); | |
d9c2f47f | 392 | return (error); |
3ebb7a40 BJ |
393 | } |
394 | ||
40056b21 | 395 | /* |
8429d022 | 396 | * Allocate a file descriptor for the process. |
40056b21 | 397 | */ |
8429d022 | 398 | int fdexpand; |
5e00df3b | 399 | |
8429d022 MK |
400 | fdalloc(p, want, result) |
401 | struct proc *p; | |
402 | int want; | |
c4ec2128 | 403 | int *result; |
4147b3f6 | 404 | { |
8429d022 MK |
405 | register struct filedesc *fdp = p->p_fd; |
406 | register int i; | |
407 | int lim, last, nfiles; | |
5e00df3b KM |
408 | struct file **newofile; |
409 | char *newofileflags; | |
410 | ||
8429d022 MK |
411 | /* |
412 | * Search for a free descriptor starting at the higher | |
413 | * of want or fd_freefile. If that fails, consider | |
414 | * expanding the ofile array. | |
415 | */ | |
416 | lim = p->p_rlimit[RLIMIT_OFILE].rlim_cur; | |
5e00df3b | 417 | for (;;) { |
8429d022 MK |
418 | last = min(fdp->fd_nfiles, lim); |
419 | if ((i = want) < fdp->fd_freefile) | |
420 | i = fdp->fd_freefile; | |
421 | for (; i < last; i++) { | |
7ddc4f96 MK |
422 | if (fdp->fd_ofiles[i] == NULL) { |
423 | fdp->fd_ofileflags[i] = 0; | |
8429d022 MK |
424 | if (i > fdp->fd_lastfile) |
425 | fdp->fd_lastfile = i; | |
7ddc4f96 | 426 | if (want <= fdp->fd_freefile) |
8429d022 MK |
427 | fdp->fd_freefile = i; |
428 | *result = i; | |
5e00df3b KM |
429 | return (0); |
430 | } | |
431 | } | |
8429d022 MK |
432 | |
433 | /* | |
434 | * No space in current array. Expand? | |
435 | */ | |
436 | if (fdp->fd_nfiles >= lim) | |
5e00df3b | 437 | return (EMFILE); |
7ddc4f96 MK |
438 | if (fdp->fd_nfiles < NDEXTENT) |
439 | nfiles = NDEXTENT; | |
440 | else | |
441 | nfiles = 2 * fdp->fd_nfiles; | |
8429d022 MK |
442 | MALLOC(newofile, struct file **, nfiles * OFILESIZE, |
443 | M_FILEDESC, M_WAITOK); | |
444 | newofileflags = (char *) &newofile[nfiles]; | |
445 | /* | |
446 | * Copy the existing ofile and ofileflags arrays | |
447 | * and zero the new portion of each array. | |
448 | */ | |
449 | bcopy(fdp->fd_ofiles, newofile, | |
450 | (i = sizeof(struct file *) * fdp->fd_nfiles)); | |
451 | bzero((char *)newofile + i, nfiles * sizeof(struct file *) - i); | |
452 | bcopy(fdp->fd_ofileflags, newofileflags, | |
453 | (i = sizeof(char) * fdp->fd_nfiles)); | |
454 | bzero(newofileflags + i, nfiles * sizeof(char) - i); | |
7ddc4f96 MK |
455 | if (fdp->fd_nfiles > NDFILE) |
456 | FREE(fdp->fd_ofiles, M_FILEDESC); | |
8429d022 MK |
457 | fdp->fd_ofiles = newofile; |
458 | fdp->fd_ofileflags = newofileflags; | |
459 | fdp->fd_nfiles = nfiles; | |
460 | fdexpand++; | |
06b22f9b | 461 | } |
4147b3f6 BJ |
462 | } |
463 | ||
a53a698b | 464 | /* |
7ddc4f96 MK |
465 | * Check to see whether n user file descriptors |
466 | * are available to the process p. | |
a53a698b | 467 | */ |
8429d022 MK |
468 | fdavail(p, n) |
469 | struct proc *p; | |
470 | register int n; | |
88a7a62a | 471 | { |
8429d022 | 472 | register struct filedesc *fdp = p->p_fd; |
7ddc4f96 | 473 | register struct file **fpp; |
8429d022 | 474 | register int i; |
88a7a62a | 475 | |
8429d022 MK |
476 | if ((i = p->p_rlimit[RLIMIT_OFILE].rlim_cur - fdp->fd_nfiles) > 0 && |
477 | (n -= i) <= 0) | |
478 | return (1); | |
7ddc4f96 MK |
479 | fpp = &fdp->fd_ofiles[fdp->fd_freefile]; |
480 | for (i = fdp->fd_nfiles - fdp->fd_freefile; --i >= 0; fpp++) | |
481 | if (*fpp == NULL && --n <= 0) | |
8429d022 MK |
482 | return (1); |
483 | return (0); | |
88a7a62a SL |
484 | } |
485 | ||
4147b3f6 | 486 | /* |
8429d022 MK |
487 | * Create a new open file structure and allocate |
488 | * a file decriptor for the process that refers to it. | |
4147b3f6 | 489 | */ |
5e00df3b KM |
490 | falloc(p, resultfp, resultfd) |
491 | register struct proc *p; | |
c4ec2128 KM |
492 | struct file **resultfp; |
493 | int *resultfd; | |
4147b3f6 | 494 | { |
c753a490 | 495 | register struct file *fp, *fq, **fpp; |
c4ec2128 | 496 | int error, i; |
4147b3f6 | 497 | |
8429d022 | 498 | if (error = fdalloc(p, 0, &i)) |
c4ec2128 | 499 | return (error); |
c753a490 KM |
500 | if (nfiles >= maxfiles) { |
501 | tablefull("file"); | |
502 | return (ENFILE); | |
503 | } | |
504 | /* | |
505 | * Allocate a new file descriptor. | |
506 | * If the process has file descriptor zero open, add to the list | |
507 | * of open files at that point, otherwise put it at the front of | |
508 | * the list of open files. | |
509 | */ | |
510 | nfiles++; | |
511 | MALLOC(fp, struct file *, sizeof(struct file), M_FILE, M_WAITOK); | |
c753a490 KM |
512 | if (fq = p->p_fd->fd_ofiles[0]) |
513 | fpp = &fq->f_filef; | |
514 | else | |
515 | fpp = &filehead; | |
c1884703 | 516 | p->p_fd->fd_ofiles[i] = fp; |
c753a490 KM |
517 | if (fq = *fpp) |
518 | fq->f_fileb = &fp->f_filef; | |
519 | fp->f_filef = fq; | |
520 | fp->f_fileb = fpp; | |
521 | *fpp = fp; | |
88a7a62a | 522 | fp->f_count = 1; |
c753a490 | 523 | fp->f_msgcount = 0; |
4147b3f6 | 524 | fp->f_offset = 0; |
8429d022 | 525 | fp->f_cred = p->p_ucred; |
c4ec2128 | 526 | crhold(fp->f_cred); |
c4ec2128 KM |
527 | if (resultfp) |
528 | *resultfp = fp; | |
529 | if (resultfd) | |
530 | *resultfd = i; | |
531 | return (0); | |
4147b3f6 BJ |
532 | } |
533 | ||
c753a490 KM |
534 | /* |
535 | * Free a file descriptor. | |
536 | */ | |
537 | ffree(fp) | |
538 | register struct file *fp; | |
539 | { | |
540 | register struct file *fq; | |
541 | ||
542 | if (fq = fp->f_filef) | |
543 | fq->f_fileb = fp->f_fileb; | |
544 | *fp->f_fileb = fq; | |
545 | crfree(fp->f_cred); | |
546 | #ifdef DIAGNOSTIC | |
547 | fp->f_filef = NULL; | |
548 | fp->f_fileb = NULL; | |
549 | fp->f_count = 0; | |
550 | #endif | |
551 | nfiles--; | |
552 | FREE(fp, M_FILE); | |
553 | } | |
554 | ||
5e00df3b | 555 | /* |
8429d022 | 556 | * Copy a filedesc structure. |
5e00df3b KM |
557 | */ |
558 | struct filedesc * | |
8429d022 MK |
559 | fdcopy(p) |
560 | struct proc *p; | |
5e00df3b | 561 | { |
7ddc4f96 MK |
562 | register struct filedesc *newfdp, *fdp = p->p_fd; |
563 | register struct file **fpp; | |
5e00df3b | 564 | register int i; |
5e00df3b | 565 | |
7ddc4f96 MK |
566 | MALLOC(newfdp, struct filedesc *, sizeof(struct filedesc0), |
567 | M_FILEDESC, M_WAITOK); | |
568 | bcopy(fdp, newfdp, sizeof(struct filedesc)); | |
5e00df3b KM |
569 | VREF(newfdp->fd_cdir); |
570 | if (newfdp->fd_rdir) | |
571 | VREF(newfdp->fd_rdir); | |
572 | newfdp->fd_refcnt = 1; | |
8429d022 MK |
573 | |
574 | /* | |
7ddc4f96 MK |
575 | * If the number of open files fits in the internal arrays |
576 | * of the open file structure, use them, otherwise allocate | |
577 | * additional memory for the number of descriptors currently | |
578 | * in use. | |
8429d022 | 579 | */ |
7ddc4f96 MK |
580 | if (newfdp->fd_lastfile < NDFILE) { |
581 | newfdp->fd_ofiles = ((struct filedesc0 *) newfdp)->fd_dfiles; | |
582 | newfdp->fd_ofileflags = | |
583 | ((struct filedesc0 *) newfdp)->fd_dfileflags; | |
584 | i = NDFILE; | |
585 | } else { | |
586 | /* | |
587 | * Compute the smallest multiple of NDEXTENT needed | |
588 | * for the file descriptors currently in use, | |
589 | * allowing the table to shrink. | |
590 | */ | |
591 | i = newfdp->fd_nfiles; | |
592 | while (i > 2 * NDEXTENT && i >= newfdp->fd_lastfile * 2) | |
593 | i /= 2; | |
594 | MALLOC(newfdp->fd_ofiles, struct file **, i * OFILESIZE, | |
595 | M_FILEDESC, M_WAITOK); | |
596 | newfdp->fd_ofileflags = (char *) &newfdp->fd_ofiles[i]; | |
597 | } | |
8429d022 | 598 | newfdp->fd_nfiles = i; |
8429d022 MK |
599 | bcopy(fdp->fd_ofiles, newfdp->fd_ofiles, i * sizeof(struct file **)); |
600 | bcopy(fdp->fd_ofileflags, newfdp->fd_ofileflags, i * sizeof(char)); | |
7ddc4f96 MK |
601 | fpp = newfdp->fd_ofiles; |
602 | for (i = newfdp->fd_lastfile; i-- >= 0; fpp++) | |
603 | if (*fpp != NULL) | |
604 | (*fpp)->f_count++; | |
5e00df3b KM |
605 | return (newfdp); |
606 | } | |
607 | ||
608 | /* | |
609 | * Release a filedesc structure. | |
610 | */ | |
7ddc4f96 | 611 | void |
8429d022 MK |
612 | fdfree(p) |
613 | struct proc *p; | |
5e00df3b | 614 | { |
8429d022 | 615 | register struct filedesc *fdp = p->p_fd; |
7ddc4f96 | 616 | struct file **fpp; |
5e00df3b KM |
617 | register int i; |
618 | ||
8429d022 | 619 | if (--fdp->fd_refcnt > 0) |
5e00df3b | 620 | return; |
7ddc4f96 MK |
621 | fpp = fdp->fd_ofiles; |
622 | for (i = fdp->fd_lastfile; i-- >= 0; fpp++) | |
623 | if (*fpp) | |
624 | (void) closef(*fpp, p); | |
625 | if (fdp->fd_nfiles > NDFILE) | |
626 | FREE(fdp->fd_ofiles, M_FILEDESC); | |
5e00df3b KM |
627 | vrele(fdp->fd_cdir); |
628 | if (fdp->fd_rdir) | |
629 | vrele(fdp->fd_rdir); | |
8429d022 | 630 | FREE(fdp, M_FILEDESC); |
5e00df3b KM |
631 | } |
632 | ||
4147b3f6 BJ |
633 | /* |
634 | * Internal form of close. | |
88a7a62a | 635 | * Decrement reference count on file structure. |
93ca0e50 MK |
636 | * Note: p may be NULL when closing a file |
637 | * that was being passed in a message. | |
4147b3f6 | 638 | */ |
8429d022 | 639 | closef(fp, p) |
4147b3f6 | 640 | register struct file *fp; |
c753a490 | 641 | register struct proc *p; |
4147b3f6 | 642 | { |
a4128336 KM |
643 | struct vnode *vp; |
644 | struct flock lf; | |
f9934296 | 645 | int error; |
4147b3f6 | 646 | |
40056b21 | 647 | if (fp == NULL) |
f9934296 | 648 | return (0); |
a4128336 KM |
649 | /* |
650 | * POSIX record locking dictates that any close releases ALL | |
651 | * locks owned by this process. This is handled by setting | |
652 | * a flag in the unlock to free ONLY locks obeying POSIX | |
653 | * semantics, and not to free BSD-style file locks. | |
93ca0e50 MK |
654 | * If the descriptor was in a message, POSIX-style locks |
655 | * aren't passed with the descriptor. | |
a4128336 | 656 | */ |
93ca0e50 | 657 | if (p && (p->p_flag & SADVLCK) && fp->f_type == DTYPE_VNODE) { |
a4128336 KM |
658 | lf.l_whence = SEEK_SET; |
659 | lf.l_start = 0; | |
660 | lf.l_len = 0; | |
661 | lf.l_type = F_UNLCK; | |
662 | vp = (struct vnode *)fp->f_data; | |
208eb71b | 663 | (void) VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_POSIX); |
a4128336 | 664 | } |
8429d022 | 665 | if (--fp->f_count > 0) |
f9934296 | 666 | return (0); |
8429d022 MK |
667 | if (fp->f_count < 0) |
668 | panic("closef: count < 0"); | |
9bd5ee04 KM |
669 | if ((fp->f_flag & FHASLOCK) && fp->f_type == DTYPE_VNODE) { |
670 | lf.l_whence = SEEK_SET; | |
671 | lf.l_start = 0; | |
672 | lf.l_len = 0; | |
673 | lf.l_type = F_UNLCK; | |
674 | vp = (struct vnode *)fp->f_data; | |
208eb71b | 675 | (void) VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK); |
9bd5ee04 | 676 | } |
208eb71b | 677 | error = (*fp->f_ops->fo_close)(fp, p); |
c753a490 | 678 | ffree(fp); |
f9934296 | 679 | return (error); |
8d528261 | 680 | } |
92438dfc SL |
681 | |
682 | /* | |
683 | * Apply an advisory lock on a file descriptor. | |
a4128336 KM |
684 | * |
685 | * Just attempt to get a record lock of the requested type on | |
686 | * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0). | |
92438dfc | 687 | */ |
d5820a3c CT |
688 | struct flock_args { |
689 | int fd; | |
690 | int how; | |
691 | }; | |
a53a698b KM |
692 | /* ARGSUSED */ |
693 | flock(p, uap, retval) | |
694 | struct proc *p; | |
d5820a3c | 695 | register struct flock_args *uap; |
a53a698b KM |
696 | int *retval; |
697 | { | |
5e00df3b | 698 | register struct filedesc *fdp = p->p_fd; |
92438dfc | 699 | register struct file *fp; |
a4128336 KM |
700 | struct vnode *vp; |
701 | struct flock lf; | |
702 | int error; | |
92438dfc | 703 | |
8429d022 | 704 | if ((unsigned)uap->fd >= fdp->fd_nfiles || |
7ddc4f96 | 705 | (fp = fdp->fd_ofiles[uap->fd]) == NULL) |
d9c2f47f | 706 | return (EBADF); |
a53a698b | 707 | if (fp->f_type != DTYPE_VNODE) |
d9c2f47f | 708 | return (EOPNOTSUPP); |
a4128336 KM |
709 | vp = (struct vnode *)fp->f_data; |
710 | lf.l_whence = SEEK_SET; | |
711 | lf.l_start = 0; | |
712 | lf.l_len = 0; | |
55dfda24 | 713 | if (uap->how & LOCK_UN) { |
a4128336 | 714 | lf.l_type = F_UNLCK; |
9bd5ee04 | 715 | fp->f_flag &= ~FHASLOCK; |
208eb71b | 716 | return (VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK)); |
92438dfc | 717 | } |
742253b3 | 718 | if (uap->how & LOCK_EX) |
a4128336 KM |
719 | lf.l_type = F_WRLCK; |
720 | else if (uap->how & LOCK_SH) | |
721 | lf.l_type = F_RDLCK; | |
722 | else | |
723 | return (EBADF); | |
9bd5ee04 | 724 | fp->f_flag |= FHASLOCK; |
a4128336 | 725 | if (uap->how & LOCK_NB) |
208eb71b KM |
726 | return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK)); |
727 | return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK|F_WAIT)); | |
92438dfc | 728 | } |
75ebd8c9 MT |
729 | |
730 | /* | |
731 | * File Descriptor pseudo-device driver (/dev/fd/). | |
732 | * | |
75ebd8c9 MT |
733 | * Opening minor device N dup()s the file (if any) connected to file |
734 | * descriptor N belonging to the calling process. Note that this driver | |
735 | * consists of only the ``open()'' routine, because all subsequent | |
736 | * references to this file will be direct to the other driver. | |
737 | */ | |
c4ec2128 | 738 | /* ARGSUSED */ |
b640277d | 739 | fdopen(dev, mode, type, p) |
75ebd8c9 | 740 | dev_t dev; |
c4ec2128 | 741 | int mode, type; |
b640277d | 742 | struct proc *p; |
75ebd8c9 | 743 | { |
75ebd8c9 MT |
744 | |
745 | /* | |
8429d022 | 746 | * XXX Kludge: set curproc->p_dupfd to contain the value of the |
1105efe2 KM |
747 | * the file descriptor being sought for duplication. The error |
748 | * return ensures that the vnode for this device will be released | |
749 | * by vn_open. Open will detect this special error and take the | |
750 | * actions in dupfdopen below. Other callers of vn_open or VOP_OPEN | |
751 | * will simply report the error. | |
75ebd8c9 | 752 | */ |
b640277d | 753 | p->p_dupfd = minor(dev); |
1105efe2 KM |
754 | return (ENODEV); |
755 | } | |
e99d5db8 | 756 | |
1105efe2 KM |
757 | /* |
758 | * Duplicate the specified descriptor to a free descriptor. | |
759 | */ | |
d1c3140e | 760 | dupfdopen(fdp, indx, dfd, mode, error) |
5e00df3b | 761 | register struct filedesc *fdp; |
1105efe2 KM |
762 | register int indx, dfd; |
763 | int mode; | |
d1c3140e | 764 | int error; |
1105efe2 KM |
765 | { |
766 | register struct file *wfp; | |
767 | struct file *fp; | |
768 | ||
75ebd8c9 | 769 | /* |
1105efe2 KM |
770 | * If the to-be-dup'd fd number is greater than the allowed number |
771 | * of file descriptors, or the fd to be dup'd has already been | |
772 | * closed, reject. Note, check for new == old is necessary as | |
773 | * falloc could allocate an already closed to-be-dup'd descriptor | |
774 | * as the new descriptor. | |
75ebd8c9 | 775 | */ |
7ddc4f96 MK |
776 | fp = fdp->fd_ofiles[indx]; |
777 | if ((u_int)dfd >= fdp->fd_nfiles || | |
778 | (wfp = fdp->fd_ofiles[dfd]) == NULL || fp == wfp) | |
75ebd8c9 | 779 | return (EBADF); |
e99d5db8 | 780 | |
75ebd8c9 | 781 | /* |
d1c3140e JSP |
782 | * There are two cases of interest here. |
783 | * | |
784 | * For ENODEV simply dup (dfd) to file descriptor | |
785 | * (indx) and return. | |
786 | * | |
787 | * For ENXIO steal away the file structure from (dfd) and | |
788 | * store it in (indx). (dfd) is effectively closed by | |
789 | * this operation. | |
790 | * | |
791 | * Any other error code is just returned. | |
75ebd8c9 | 792 | */ |
d1c3140e JSP |
793 | switch (error) { |
794 | case ENODEV: | |
795 | /* | |
796 | * Check that the mode the file is being opened for is a | |
797 | * subset of the mode of the existing descriptor. | |
798 | */ | |
799 | if (((mode & (FREAD|FWRITE)) | wfp->f_flag) != wfp->f_flag) | |
800 | return (EACCES); | |
801 | fdp->fd_ofiles[indx] = wfp; | |
802 | fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd]; | |
803 | wfp->f_count++; | |
804 | if (indx > fdp->fd_lastfile) | |
805 | fdp->fd_lastfile = indx; | |
806 | return (0); | |
807 | ||
808 | case ENXIO: | |
809 | /* | |
810 | * Steal away the file pointer from dfd, and stuff it into indx. | |
811 | */ | |
812 | fdp->fd_ofiles[indx] = fdp->fd_ofiles[dfd]; | |
813 | fdp->fd_ofiles[dfd] = NULL; | |
814 | fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd]; | |
815 | fdp->fd_ofileflags[dfd] = 0; | |
816 | /* | |
817 | * Complete the clean up of the filedesc structure by | |
818 | * recomputing the various hints. | |
819 | */ | |
820 | if (indx > fdp->fd_lastfile) | |
821 | fdp->fd_lastfile = indx; | |
822 | else | |
823 | while (fdp->fd_lastfile > 0 && | |
824 | fdp->fd_ofiles[fdp->fd_lastfile] == NULL) | |
825 | fdp->fd_lastfile--; | |
826 | if (dfd < fdp->fd_freefile) | |
827 | fdp->fd_freefile = dfd; | |
828 | return (0); | |
829 | ||
830 | default: | |
831 | return (error); | |
832 | } | |
833 | /* NOTREACHED */ | |
75ebd8c9 | 834 | } |