Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
1acdbcea KB |
2 | * Copyright (c) 1982, 1986, 1989, 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
adb35f79 KB |
4 | * (c) UNIX System Laboratories, Inc. |
5 | * All or some portions of this file are derived from material licensed | |
6 | * to the University of California by American Telephone and Telegraph | |
7 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with | |
8 | * the permission of UNIX System Laboratories, Inc. | |
da7c5cc6 | 9 | * |
dbf0c423 | 10 | * %sccs.include.redist.c% |
c4ec2128 | 11 | * |
29e5014e | 12 | * @(#)kern_descrip.c 8.8 (Berkeley) %G% |
da7c5cc6 | 13 | */ |
40056b21 | 14 | |
38a01dbe KB |
15 | #include <sys/param.h> |
16 | #include <sys/systm.h> | |
17 | #include <sys/filedesc.h> | |
18 | #include <sys/kernel.h> | |
19 | #include <sys/vnode.h> | |
20 | #include <sys/proc.h> | |
21 | #include <sys/file.h> | |
22 | #include <sys/socket.h> | |
23 | #include <sys/socketvar.h> | |
24 | #include <sys/stat.h> | |
25 | #include <sys/ioctl.h> | |
26 | #include <sys/fcntl.h> | |
27 | #include <sys/malloc.h> | |
28 | #include <sys/syslog.h> | |
cece3911 | 29 | #include <sys/unistd.h> |
38a01dbe | 30 | #include <sys/resourcevar.h> |
4147b3f6 | 31 | |
29e5014e CD |
32 | #include <sys/mount.h> |
33 | #include <sys/syscallargs.h> | |
34 | ||
4147b3f6 BJ |
35 | /* |
36 | * Descriptor management. | |
37 | */ | |
3ef0a118 KM |
38 | struct filelist filehead; /* head of list of open files */ |
39 | int nfiles; /* actual number of open files */ | |
4147b3f6 | 40 | |
40056b21 | 41 | /* |
4147b3f6 | 42 | * System calls on descriptors. |
40056b21 | 43 | */ |
a53a698b | 44 | /* ARGSUSED */ |
29e5014e | 45 | int |
a53a698b KM |
46 | getdtablesize(p, uap, retval) |
47 | struct proc *p; | |
29e5014e CD |
48 | void *uap; |
49 | register_t *retval; | |
4147b3f6 BJ |
50 | { |
51 | ||
e0ed5a07 | 52 | *retval = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles); |
d9c2f47f | 53 | return (0); |
4147b3f6 BJ |
54 | } |
55 | ||
a53a698b KM |
56 | /* |
57 | * Duplicate a file descriptor. | |
58 | */ | |
59 | /* ARGSUSED */ | |
29e5014e | 60 | int |
a53a698b KM |
61 | dup(p, uap, retval) |
62 | struct proc *p; | |
29e5014e CD |
63 | struct dup_args /* { |
64 | syscallarg(u_int) fd; | |
65 | } */ *uap; | |
66 | register_t *retval; | |
a53a698b | 67 | { |
e0ed5a07 KM |
68 | register struct filedesc *fdp; |
69 | u_int old; | |
70 | int new, error; | |
4147b3f6 | 71 | |
29e5014e | 72 | old = SCARG(uap, fd); |
a53a698b KM |
73 | /* |
74 | * XXX Compatibility | |
75 | */ | |
29e5014e CD |
76 | if (old &~ 077) { |
77 | SCARG(uap, fd) &= 077; | |
78 | return (dup2(p, uap, retval)); | |
79 | } | |
4147b3f6 | 80 | |
e0ed5a07 KM |
81 | fdp = p->p_fd; |
82 | if (old >= fdp->fd_nfiles || fdp->fd_ofiles[old] == NULL) | |
d9c2f47f | 83 | return (EBADF); |
e0ed5a07 | 84 | if (error = fdalloc(p, 0, &new)) |
d9c2f47f | 85 | return (error); |
e0ed5a07 | 86 | return (finishdup(fdp, (int)old, new, retval)); |
4147b3f6 BJ |
87 | } |
88 | ||
a53a698b KM |
89 | /* |
90 | * Duplicate a file descriptor to a particular value. | |
91 | */ | |
92 | /* ARGSUSED */ | |
29e5014e | 93 | int |
a53a698b KM |
94 | dup2(p, uap, retval) |
95 | struct proc *p; | |
29e5014e CD |
96 | struct dup2_args /* { |
97 | syscallarg(u_int) from; | |
98 | syscallarg(u_int) to; | |
99 | } */ *uap; | |
100 | register_t *retval; | |
4147b3f6 | 101 | { |
5e00df3b | 102 | register struct filedesc *fdp = p->p_fd; |
29e5014e | 103 | register int old = SCARG(uap, from), new = SCARG(uap, to); |
5e00df3b | 104 | int i, error; |
40056b21 | 105 | |
7ddc4f96 | 106 | if (old >= fdp->fd_nfiles || |
e0ed5a07 | 107 | fdp->fd_ofiles[old] == NULL || |
271cfd89 | 108 | new >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur || |
e0ed5a07 | 109 | new >= maxfiles) |
d9c2f47f | 110 | return (EBADF); |
e0ed5a07 KM |
111 | if (old == new) { |
112 | *retval = new; | |
d9c2f47f | 113 | return (0); |
e0ed5a07 | 114 | } |
7ddc4f96 MK |
115 | if (new >= fdp->fd_nfiles) { |
116 | if (error = fdalloc(p, new, &i)) | |
5e00df3b | 117 | return (error); |
7ddc4f96 | 118 | if (new != i) |
8429d022 | 119 | panic("dup2: fdalloc"); |
7ddc4f96 MK |
120 | } else if (fdp->fd_ofiles[new]) { |
121 | if (fdp->fd_ofileflags[new] & UF_MAPPED) | |
122 | (void) munmapfd(p, new); | |
123 | /* | |
124 | * dup2() must succeed even if the close has an error. | |
125 | */ | |
126 | (void) closef(fdp->fd_ofiles[new], p); | |
4147b3f6 | 127 | } |
e0ed5a07 | 128 | return (finishdup(fdp, (int)old, (int)new, retval)); |
a81e9a81 SL |
129 | } |
130 | ||
88a7a62a SL |
131 | /* |
132 | * The file control system call. | |
133 | */ | |
a53a698b | 134 | /* ARGSUSED */ |
29e5014e | 135 | int |
a53a698b KM |
136 | fcntl(p, uap, retval) |
137 | struct proc *p; | |
29e5014e CD |
138 | register struct fcntl_args /* { |
139 | syscallarg(int) fd; | |
140 | syscallarg(int) cmd; | |
141 | syscallarg(void *) arg; | |
142 | } */ *uap; | |
143 | register_t *retval; | |
a53a698b | 144 | { |
29e5014e | 145 | int fd = SCARG(uap, fd); |
5e00df3b | 146 | register struct filedesc *fdp = p->p_fd; |
a53a698b | 147 | register struct file *fp; |
88a7a62a | 148 | register char *pop; |
a4128336 | 149 | struct vnode *vp; |
208eb71b | 150 | int i, tmp, error, flg = F_POSIX; |
a4128336 | 151 | struct flock fl; |
e0ed5a07 | 152 | u_int newmin; |
4147b3f6 | 153 | |
29e5014e CD |
154 | if ((u_int)fd >= fdp->fd_nfiles || |
155 | (fp = fdp->fd_ofiles[fd]) == NULL) | |
d9c2f47f | 156 | return (EBADF); |
29e5014e CD |
157 | pop = &fdp->fd_ofileflags[fd]; |
158 | switch (SCARG(uap, cmd)) { | |
e0ed5a07 | 159 | |
85f01bd4 | 160 | case F_DUPFD: |
29e5014e | 161 | newmin = (long)SCARG(uap, arg); |
e0ed5a07 KM |
162 | if (newmin >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur || |
163 | newmin >= maxfiles) | |
d9c2f47f | 164 | return (EINVAL); |
e0ed5a07 | 165 | if (error = fdalloc(p, newmin, &i)) |
d9c2f47f | 166 | return (error); |
29e5014e | 167 | return (finishdup(fdp, fd, i, retval)); |
12438177 | 168 | |
85f01bd4 | 169 | case F_GETFD: |
a53a698b | 170 | *retval = *pop & 1; |
d9c2f47f | 171 | return (0); |
40056b21 | 172 | |
85f01bd4 | 173 | case F_SETFD: |
29e5014e | 174 | *pop = (*pop &~ 1) | ((long)SCARG(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 | 182 | fp->f_flag &= ~FCNTLFLAGS; |
29e5014e | 183 | fp->f_flag |= FFLAGS((long)SCARG(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) | |
29e5014e | 203 | (fp, TIOCGPGRP, (caddr_t)retval, p); |
208eb71b KM |
204 | *retval = -*retval; |
205 | return (error); | |
88a7a62a | 206 | |
85f01bd4 | 207 | case F_SETOWN: |
208eb71b | 208 | if (fp->f_type == DTYPE_SOCKET) { |
29e5014e CD |
209 | ((struct socket *)fp->f_data)->so_pgid = |
210 | (long)SCARG(uap, arg); | |
208eb71b KM |
211 | return (0); |
212 | } | |
29e5014e CD |
213 | if ((long)SCARG(uap, arg) <= 0) { |
214 | SCARG(uap, arg) = (void *)(-(long)SCARG(uap, arg)); | |
208eb71b | 215 | } else { |
29e5014e | 216 | struct proc *p1 = pfind((long)SCARG(uap, arg)); |
208eb71b KM |
217 | if (p1 == 0) |
218 | return (ESRCH); | |
29e5014e | 219 | SCARG(uap, arg) = (void *)(long)p1->p_pgrp->pg_id; |
208eb71b KM |
220 | } |
221 | return ((*fp->f_ops->fo_ioctl) | |
29e5014e | 222 | (fp, TIOCSPGRP, (caddr_t)&SCARG(uap, arg), p)); |
88a7a62a | 223 | |
a4128336 | 224 | case F_SETLKW: |
208eb71b | 225 | flg |= F_WAIT; |
a4128336 KM |
226 | /* Fall into F_SETLK */ |
227 | ||
228 | case F_SETLK: | |
229 | if (fp->f_type != DTYPE_VNODE) | |
230 | return (EBADF); | |
231 | vp = (struct vnode *)fp->f_data; | |
232 | /* Copy in the lock structure */ | |
29e5014e CD |
233 | error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&fl, |
234 | sizeof (fl)); | |
a4128336 KM |
235 | if (error) |
236 | return (error); | |
237 | if (fl.l_whence == SEEK_CUR) | |
238 | fl.l_start += fp->f_offset; | |
239 | switch (fl.l_type) { | |
240 | ||
241 | case F_RDLCK: | |
242 | if ((fp->f_flag & FREAD) == 0) | |
243 | return (EBADF); | |
cf5ef508 | 244 | p->p_flag |= P_ADVLOCK; |
208eb71b | 245 | return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg)); |
a4128336 KM |
246 | |
247 | case F_WRLCK: | |
248 | if ((fp->f_flag & FWRITE) == 0) | |
249 | return (EBADF); | |
cf5ef508 | 250 | p->p_flag |= P_ADVLOCK; |
208eb71b | 251 | return (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &fl, flg)); |
a4128336 KM |
252 | |
253 | case F_UNLCK: | |
208eb71b KM |
254 | return (VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &fl, |
255 | F_POSIX)); | |
a4128336 KM |
256 | |
257 | default: | |
258 | return (EINVAL); | |
259 | } | |
260 | ||
261 | case F_GETLK: | |
262 | if (fp->f_type != DTYPE_VNODE) | |
263 | return (EBADF); | |
264 | vp = (struct vnode *)fp->f_data; | |
265 | /* Copy in the lock structure */ | |
29e5014e CD |
266 | error = copyin((caddr_t)SCARG(uap, arg), (caddr_t)&fl, |
267 | sizeof (fl)); | |
a4128336 KM |
268 | if (error) |
269 | return (error); | |
2975e814 KM |
270 | if (fl.l_whence == SEEK_CUR) |
271 | fl.l_start += fp->f_offset; | |
208eb71b | 272 | if (error = VOP_ADVLOCK(vp, (caddr_t)p, F_GETLK, &fl, F_POSIX)) |
a4128336 | 273 | return (error); |
29e5014e CD |
274 | return (copyout((caddr_t)&fl, (caddr_t)SCARG(uap, arg), |
275 | sizeof (fl))); | |
a4128336 | 276 | |
88a7a62a | 277 | default: |
d9c2f47f | 278 | return (EINVAL); |
40056b21 | 279 | } |
a53a698b | 280 | /* NOTREACHED */ |
40056b21 BJ |
281 | } |
282 | ||
e0ed5a07 KM |
283 | /* |
284 | * Common code for dup, dup2, and fcntl(F_DUPFD). | |
285 | */ | |
286 | int | |
287 | finishdup(fdp, old, new, retval) | |
288 | register struct filedesc *fdp; | |
29e5014e CD |
289 | register int old, new; |
290 | register_t *retval; | |
e0ed5a07 KM |
291 | { |
292 | register struct file *fp; | |
293 | ||
294 | fp = fdp->fd_ofiles[old]; | |
295 | fdp->fd_ofiles[new] = fp; | |
296 | fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] &~ UF_EXCLOSE; | |
297 | fp->f_count++; | |
298 | if (new > fdp->fd_lastfile) | |
299 | fdp->fd_lastfile = new; | |
300 | *retval = new; | |
301 | return (0); | |
302 | } | |
303 | ||
a53a698b KM |
304 | /* |
305 | * Close a file descriptor. | |
306 | */ | |
307 | /* ARGSUSED */ | |
29e5014e | 308 | int |
a53a698b KM |
309 | close(p, uap, retval) |
310 | struct proc *p; | |
29e5014e CD |
311 | struct close_args /* { |
312 | syscallarg(int) fd; | |
313 | } */ *uap; | |
314 | register_t *retval; | |
a53a698b | 315 | { |
29e5014e | 316 | int fd = SCARG(uap, fd); |
5e00df3b | 317 | register struct filedesc *fdp = p->p_fd; |
88a7a62a | 318 | register struct file *fp; |
92438dfc | 319 | register u_char *pf; |
3ebb7a40 | 320 | |
29e5014e | 321 | if ((u_int)fd >= fdp->fd_nfiles || |
7ddc4f96 | 322 | (fp = fdp->fd_ofiles[fd]) == NULL) |
d9c2f47f | 323 | return (EBADF); |
7ddc4f96 | 324 | pf = (u_char *)&fdp->fd_ofileflags[fd]; |
92438dfc | 325 | if (*pf & UF_MAPPED) |
8429d022 | 326 | (void) munmapfd(p, fd); |
7ddc4f96 MK |
327 | fdp->fd_ofiles[fd] = NULL; |
328 | while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL) | |
5e00df3b | 329 | fdp->fd_lastfile--; |
8429d022 MK |
330 | if (fd < fdp->fd_freefile) |
331 | fdp->fd_freefile = fd; | |
92438dfc | 332 | *pf = 0; |
8429d022 | 333 | return (closef(fp, p)); |
92438dfc SL |
334 | } |
335 | ||
0c1cfb60 | 336 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
a53a698b KM |
337 | /* |
338 | * Return status information about a file descriptor. | |
339 | */ | |
340 | /* ARGSUSED */ | |
29e5014e CD |
341 | int |
342 | compat_43_fstat(p, uap, retval) | |
6150798f | 343 | struct proc *p; |
29e5014e CD |
344 | register struct compat_43_fstat_args /* { |
345 | syscallarg(int) fd; | |
346 | syscallarg(struct ostat *) sb; | |
347 | } */ *uap; | |
348 | register_t *retval; | |
6150798f | 349 | { |
29e5014e | 350 | int fd = SCARG(uap, fd); |
6150798f KM |
351 | register struct filedesc *fdp = p->p_fd; |
352 | register struct file *fp; | |
353 | struct stat ub; | |
354 | struct ostat oub; | |
355 | int error; | |
356 | ||
29e5014e CD |
357 | if ((u_int)fd >= fdp->fd_nfiles || |
358 | (fp = fdp->fd_ofiles[fd]) == NULL) | |
6150798f KM |
359 | return (EBADF); |
360 | switch (fp->f_type) { | |
361 | ||
362 | case DTYPE_VNODE: | |
363 | error = vn_stat((struct vnode *)fp->f_data, &ub, p); | |
364 | break; | |
365 | ||
366 | case DTYPE_SOCKET: | |
367 | error = soo_stat((struct socket *)fp->f_data, &ub); | |
368 | break; | |
369 | ||
370 | default: | |
0c1cfb60 | 371 | panic("ofstat"); |
6150798f KM |
372 | /*NOTREACHED*/ |
373 | } | |
374 | cvtstat(&ub, &oub); | |
375 | if (error == 0) | |
29e5014e CD |
376 | error = copyout((caddr_t)&oub, (caddr_t)SCARG(uap, sb), |
377 | sizeof (oub)); | |
6150798f KM |
378 | return (error); |
379 | } | |
0c1cfb60 | 380 | #endif /* COMPAT_43 || COMPAT_SUNOS */ |
6150798f KM |
381 | |
382 | /* | |
383 | * Return status information about a file descriptor. | |
384 | */ | |
385 | /* ARGSUSED */ | |
29e5014e | 386 | int |
a5bec772 | 387 | fstat(p, uap, retval) |
a53a698b | 388 | struct proc *p; |
29e5014e CD |
389 | register struct fstat_args /* { |
390 | syscallarg(int) fd; | |
391 | syscallarg(struct stat *) sb; | |
392 | } */ *uap; | |
393 | register_t *retval; | |
a53a698b | 394 | { |
29e5014e | 395 | int fd = SCARG(uap, fd); |
5e00df3b | 396 | register struct filedesc *fdp = p->p_fd; |
a53a698b | 397 | register struct file *fp; |
92438dfc | 398 | struct stat ub; |
a53a698b | 399 | int error; |
92438dfc | 400 | |
29e5014e CD |
401 | if ((u_int)fd >= fdp->fd_nfiles || |
402 | (fp = fdp->fd_ofiles[fd]) == NULL) | |
d9c2f47f | 403 | return (EBADF); |
92438dfc SL |
404 | switch (fp->f_type) { |
405 | ||
c4ec2128 | 406 | case DTYPE_VNODE: |
208eb71b | 407 | error = vn_stat((struct vnode *)fp->f_data, &ub, p); |
92438dfc SL |
408 | break; |
409 | ||
410 | case DTYPE_SOCKET: | |
a53a698b | 411 | error = soo_stat((struct socket *)fp->f_data, &ub); |
92438dfc SL |
412 | break; |
413 | ||
414 | default: | |
415 | panic("fstat"); | |
416 | /*NOTREACHED*/ | |
417 | } | |
a53a698b | 418 | if (error == 0) |
29e5014e CD |
419 | error = copyout((caddr_t)&ub, (caddr_t)SCARG(uap, sb), |
420 | sizeof (ub)); | |
d9c2f47f | 421 | return (error); |
3ebb7a40 BJ |
422 | } |
423 | ||
cece3911 KM |
424 | /* |
425 | * Return pathconf information about a file descriptor. | |
426 | */ | |
cece3911 | 427 | /* ARGSUSED */ |
29e5014e | 428 | int |
cece3911 KM |
429 | fpathconf(p, uap, retval) |
430 | struct proc *p; | |
29e5014e CD |
431 | register struct fpathconf_args /* { |
432 | syscallarg(int) fd; | |
433 | syscallarg(int) name; | |
434 | } */ *uap; | |
435 | register_t *retval; | |
cece3911 | 436 | { |
29e5014e | 437 | int fd = SCARG(uap, fd); |
cece3911 KM |
438 | struct filedesc *fdp = p->p_fd; |
439 | struct file *fp; | |
440 | struct vnode *vp; | |
441 | ||
29e5014e CD |
442 | if ((u_int)fd >= fdp->fd_nfiles || |
443 | (fp = fdp->fd_ofiles[fd]) == NULL) | |
cece3911 KM |
444 | return (EBADF); |
445 | switch (fp->f_type) { | |
446 | ||
447 | case DTYPE_SOCKET: | |
29e5014e | 448 | if (SCARG(uap, name) != _PC_PIPE_BUF) |
cece3911 KM |
449 | return (EINVAL); |
450 | *retval = PIPE_BUF; | |
451 | return (0); | |
452 | ||
453 | case DTYPE_VNODE: | |
454 | vp = (struct vnode *)fp->f_data; | |
29e5014e | 455 | return (VOP_PATHCONF(vp, SCARG(uap, name), retval)); |
cece3911 KM |
456 | |
457 | default: | |
458 | panic("fpathconf"); | |
459 | } | |
460 | /*NOTREACHED*/ | |
461 | } | |
462 | ||
40056b21 | 463 | /* |
8429d022 | 464 | * Allocate a file descriptor for the process. |
40056b21 | 465 | */ |
8429d022 | 466 | int fdexpand; |
5e00df3b | 467 | |
29e5014e | 468 | int |
8429d022 MK |
469 | fdalloc(p, want, result) |
470 | struct proc *p; | |
471 | int want; | |
c4ec2128 | 472 | int *result; |
4147b3f6 | 473 | { |
8429d022 MK |
474 | register struct filedesc *fdp = p->p_fd; |
475 | register int i; | |
476 | int lim, last, nfiles; | |
5e00df3b KM |
477 | struct file **newofile; |
478 | char *newofileflags; | |
479 | ||
8429d022 MK |
480 | /* |
481 | * Search for a free descriptor starting at the higher | |
482 | * of want or fd_freefile. If that fails, consider | |
483 | * expanding the ofile array. | |
484 | */ | |
e0ed5a07 | 485 | lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles); |
5e00df3b | 486 | for (;;) { |
8429d022 MK |
487 | last = min(fdp->fd_nfiles, lim); |
488 | if ((i = want) < fdp->fd_freefile) | |
489 | i = fdp->fd_freefile; | |
490 | for (; i < last; i++) { | |
7ddc4f96 MK |
491 | if (fdp->fd_ofiles[i] == NULL) { |
492 | fdp->fd_ofileflags[i] = 0; | |
8429d022 MK |
493 | if (i > fdp->fd_lastfile) |
494 | fdp->fd_lastfile = i; | |
7ddc4f96 | 495 | if (want <= fdp->fd_freefile) |
8429d022 MK |
496 | fdp->fd_freefile = i; |
497 | *result = i; | |
5e00df3b KM |
498 | return (0); |
499 | } | |
500 | } | |
8429d022 MK |
501 | |
502 | /* | |
503 | * No space in current array. Expand? | |
504 | */ | |
505 | if (fdp->fd_nfiles >= lim) | |
5e00df3b | 506 | return (EMFILE); |
7ddc4f96 MK |
507 | if (fdp->fd_nfiles < NDEXTENT) |
508 | nfiles = NDEXTENT; | |
509 | else | |
510 | nfiles = 2 * fdp->fd_nfiles; | |
8429d022 MK |
511 | MALLOC(newofile, struct file **, nfiles * OFILESIZE, |
512 | M_FILEDESC, M_WAITOK); | |
513 | newofileflags = (char *) &newofile[nfiles]; | |
514 | /* | |
515 | * Copy the existing ofile and ofileflags arrays | |
516 | * and zero the new portion of each array. | |
517 | */ | |
518 | bcopy(fdp->fd_ofiles, newofile, | |
519 | (i = sizeof(struct file *) * fdp->fd_nfiles)); | |
520 | bzero((char *)newofile + i, nfiles * sizeof(struct file *) - i); | |
521 | bcopy(fdp->fd_ofileflags, newofileflags, | |
522 | (i = sizeof(char) * fdp->fd_nfiles)); | |
523 | bzero(newofileflags + i, nfiles * sizeof(char) - i); | |
7ddc4f96 MK |
524 | if (fdp->fd_nfiles > NDFILE) |
525 | FREE(fdp->fd_ofiles, M_FILEDESC); | |
8429d022 MK |
526 | fdp->fd_ofiles = newofile; |
527 | fdp->fd_ofileflags = newofileflags; | |
528 | fdp->fd_nfiles = nfiles; | |
529 | fdexpand++; | |
06b22f9b | 530 | } |
4147b3f6 BJ |
531 | } |
532 | ||
a53a698b | 533 | /* |
7ddc4f96 MK |
534 | * Check to see whether n user file descriptors |
535 | * are available to the process p. | |
a53a698b | 536 | */ |
29e5014e | 537 | int |
8429d022 MK |
538 | fdavail(p, n) |
539 | struct proc *p; | |
540 | register int n; | |
88a7a62a | 541 | { |
8429d022 | 542 | register struct filedesc *fdp = p->p_fd; |
7ddc4f96 | 543 | register struct file **fpp; |
e0ed5a07 | 544 | register int i, lim; |
88a7a62a | 545 | |
e0ed5a07 KM |
546 | lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfiles); |
547 | if ((i = lim - fdp->fd_nfiles) > 0 && (n -= i) <= 0) | |
8429d022 | 548 | return (1); |
7ddc4f96 MK |
549 | fpp = &fdp->fd_ofiles[fdp->fd_freefile]; |
550 | for (i = fdp->fd_nfiles - fdp->fd_freefile; --i >= 0; fpp++) | |
551 | if (*fpp == NULL && --n <= 0) | |
8429d022 MK |
552 | return (1); |
553 | return (0); | |
88a7a62a SL |
554 | } |
555 | ||
4147b3f6 | 556 | /* |
8429d022 MK |
557 | * Create a new open file structure and allocate |
558 | * a file decriptor for the process that refers to it. | |
4147b3f6 | 559 | */ |
29e5014e | 560 | int |
5e00df3b KM |
561 | falloc(p, resultfp, resultfd) |
562 | register struct proc *p; | |
c4ec2128 KM |
563 | struct file **resultfp; |
564 | int *resultfd; | |
4147b3f6 | 565 | { |
3ef0a118 | 566 | register struct file *fp, *fq; |
c4ec2128 | 567 | int error, i; |
4147b3f6 | 568 | |
8429d022 | 569 | if (error = fdalloc(p, 0, &i)) |
c4ec2128 | 570 | return (error); |
c753a490 KM |
571 | if (nfiles >= maxfiles) { |
572 | tablefull("file"); | |
573 | return (ENFILE); | |
574 | } | |
575 | /* | |
576 | * Allocate a new file descriptor. | |
577 | * If the process has file descriptor zero open, add to the list | |
578 | * of open files at that point, otherwise put it at the front of | |
579 | * the list of open files. | |
580 | */ | |
581 | nfiles++; | |
582 | MALLOC(fp, struct file *, sizeof(struct file), M_FILE, M_WAITOK); | |
d1ae7e4e | 583 | bzero(fp, sizeof(struct file)); |
3ef0a118 KM |
584 | if (fq = p->p_fd->fd_ofiles[0]) { |
585 | LIST_INSERT_AFTER(fq, fp, f_list); | |
586 | } else { | |
587 | LIST_INSERT_HEAD(&filehead, fp, f_list); | |
588 | } | |
c1884703 | 589 | p->p_fd->fd_ofiles[i] = fp; |
88a7a62a | 590 | fp->f_count = 1; |
8429d022 | 591 | fp->f_cred = p->p_ucred; |
c4ec2128 | 592 | crhold(fp->f_cred); |
c4ec2128 KM |
593 | if (resultfp) |
594 | *resultfp = fp; | |
595 | if (resultfd) | |
596 | *resultfd = i; | |
597 | return (0); | |
4147b3f6 BJ |
598 | } |
599 | ||
c753a490 KM |
600 | /* |
601 | * Free a file descriptor. | |
602 | */ | |
29e5014e | 603 | void |
c753a490 KM |
604 | ffree(fp) |
605 | register struct file *fp; | |
606 | { | |
607 | register struct file *fq; | |
608 | ||
3ef0a118 | 609 | LIST_REMOVE(fp, f_list); |
c753a490 KM |
610 | crfree(fp->f_cred); |
611 | #ifdef DIAGNOSTIC | |
c753a490 KM |
612 | fp->f_count = 0; |
613 | #endif | |
614 | nfiles--; | |
615 | FREE(fp, M_FILE); | |
616 | } | |
617 | ||
5e00df3b | 618 | /* |
8429d022 | 619 | * Copy a filedesc structure. |
5e00df3b KM |
620 | */ |
621 | struct filedesc * | |
8429d022 MK |
622 | fdcopy(p) |
623 | struct proc *p; | |
5e00df3b | 624 | { |
7ddc4f96 MK |
625 | register struct filedesc *newfdp, *fdp = p->p_fd; |
626 | register struct file **fpp; | |
5e00df3b | 627 | register int i; |
5e00df3b | 628 | |
7ddc4f96 MK |
629 | MALLOC(newfdp, struct filedesc *, sizeof(struct filedesc0), |
630 | M_FILEDESC, M_WAITOK); | |
631 | bcopy(fdp, newfdp, sizeof(struct filedesc)); | |
5e00df3b KM |
632 | VREF(newfdp->fd_cdir); |
633 | if (newfdp->fd_rdir) | |
634 | VREF(newfdp->fd_rdir); | |
635 | newfdp->fd_refcnt = 1; | |
8429d022 MK |
636 | |
637 | /* | |
7ddc4f96 MK |
638 | * If the number of open files fits in the internal arrays |
639 | * of the open file structure, use them, otherwise allocate | |
640 | * additional memory for the number of descriptors currently | |
641 | * in use. | |
8429d022 | 642 | */ |
7ddc4f96 MK |
643 | if (newfdp->fd_lastfile < NDFILE) { |
644 | newfdp->fd_ofiles = ((struct filedesc0 *) newfdp)->fd_dfiles; | |
645 | newfdp->fd_ofileflags = | |
646 | ((struct filedesc0 *) newfdp)->fd_dfileflags; | |
647 | i = NDFILE; | |
648 | } else { | |
649 | /* | |
650 | * Compute the smallest multiple of NDEXTENT needed | |
651 | * for the file descriptors currently in use, | |
652 | * allowing the table to shrink. | |
653 | */ | |
654 | i = newfdp->fd_nfiles; | |
11b12875 | 655 | while (i > 2 * NDEXTENT && i > newfdp->fd_lastfile * 2) |
7ddc4f96 MK |
656 | i /= 2; |
657 | MALLOC(newfdp->fd_ofiles, struct file **, i * OFILESIZE, | |
658 | M_FILEDESC, M_WAITOK); | |
659 | newfdp->fd_ofileflags = (char *) &newfdp->fd_ofiles[i]; | |
660 | } | |
8429d022 | 661 | newfdp->fd_nfiles = i; |
8429d022 MK |
662 | bcopy(fdp->fd_ofiles, newfdp->fd_ofiles, i * sizeof(struct file **)); |
663 | bcopy(fdp->fd_ofileflags, newfdp->fd_ofileflags, i * sizeof(char)); | |
7ddc4f96 MK |
664 | fpp = newfdp->fd_ofiles; |
665 | for (i = newfdp->fd_lastfile; i-- >= 0; fpp++) | |
666 | if (*fpp != NULL) | |
667 | (*fpp)->f_count++; | |
5e00df3b KM |
668 | return (newfdp); |
669 | } | |
670 | ||
671 | /* | |
672 | * Release a filedesc structure. | |
673 | */ | |
7ddc4f96 | 674 | void |
8429d022 MK |
675 | fdfree(p) |
676 | struct proc *p; | |
5e00df3b | 677 | { |
8429d022 | 678 | register struct filedesc *fdp = p->p_fd; |
7ddc4f96 | 679 | struct file **fpp; |
5e00df3b KM |
680 | register int i; |
681 | ||
8429d022 | 682 | if (--fdp->fd_refcnt > 0) |
5e00df3b | 683 | return; |
7ddc4f96 MK |
684 | fpp = fdp->fd_ofiles; |
685 | for (i = fdp->fd_lastfile; i-- >= 0; fpp++) | |
686 | if (*fpp) | |
687 | (void) closef(*fpp, p); | |
688 | if (fdp->fd_nfiles > NDFILE) | |
689 | FREE(fdp->fd_ofiles, M_FILEDESC); | |
5e00df3b KM |
690 | vrele(fdp->fd_cdir); |
691 | if (fdp->fd_rdir) | |
692 | vrele(fdp->fd_rdir); | |
8429d022 | 693 | FREE(fdp, M_FILEDESC); |
5e00df3b KM |
694 | } |
695 | ||
4147b3f6 BJ |
696 | /* |
697 | * Internal form of close. | |
88a7a62a | 698 | * Decrement reference count on file structure. |
93ca0e50 MK |
699 | * Note: p may be NULL when closing a file |
700 | * that was being passed in a message. | |
4147b3f6 | 701 | */ |
29e5014e | 702 | int |
8429d022 | 703 | closef(fp, p) |
4147b3f6 | 704 | register struct file *fp; |
c753a490 | 705 | register struct proc *p; |
4147b3f6 | 706 | { |
a4128336 KM |
707 | struct vnode *vp; |
708 | struct flock lf; | |
f9934296 | 709 | int error; |
4147b3f6 | 710 | |
40056b21 | 711 | if (fp == NULL) |
f9934296 | 712 | return (0); |
a4128336 KM |
713 | /* |
714 | * POSIX record locking dictates that any close releases ALL | |
715 | * locks owned by this process. This is handled by setting | |
716 | * a flag in the unlock to free ONLY locks obeying POSIX | |
717 | * semantics, and not to free BSD-style file locks. | |
93ca0e50 MK |
718 | * If the descriptor was in a message, POSIX-style locks |
719 | * aren't passed with the descriptor. | |
a4128336 | 720 | */ |
cf5ef508 | 721 | if (p && (p->p_flag & P_ADVLOCK) && fp->f_type == DTYPE_VNODE) { |
a4128336 KM |
722 | lf.l_whence = SEEK_SET; |
723 | lf.l_start = 0; | |
724 | lf.l_len = 0; | |
725 | lf.l_type = F_UNLCK; | |
726 | vp = (struct vnode *)fp->f_data; | |
208eb71b | 727 | (void) VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_POSIX); |
a4128336 | 728 | } |
8429d022 | 729 | if (--fp->f_count > 0) |
f9934296 | 730 | return (0); |
8429d022 MK |
731 | if (fp->f_count < 0) |
732 | panic("closef: count < 0"); | |
9bd5ee04 KM |
733 | if ((fp->f_flag & FHASLOCK) && fp->f_type == DTYPE_VNODE) { |
734 | lf.l_whence = SEEK_SET; | |
735 | lf.l_start = 0; | |
736 | lf.l_len = 0; | |
737 | lf.l_type = F_UNLCK; | |
738 | vp = (struct vnode *)fp->f_data; | |
208eb71b | 739 | (void) VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK); |
9bd5ee04 | 740 | } |
d1ae7e4e KM |
741 | if (fp->f_ops) |
742 | error = (*fp->f_ops->fo_close)(fp, p); | |
743 | else | |
744 | error = 0; | |
c753a490 | 745 | ffree(fp); |
f9934296 | 746 | return (error); |
8d528261 | 747 | } |
92438dfc SL |
748 | |
749 | /* | |
750 | * Apply an advisory lock on a file descriptor. | |
a4128336 KM |
751 | * |
752 | * Just attempt to get a record lock of the requested type on | |
753 | * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0). | |
92438dfc | 754 | */ |
a53a698b | 755 | /* ARGSUSED */ |
29e5014e | 756 | int |
a53a698b KM |
757 | flock(p, uap, retval) |
758 | struct proc *p; | |
29e5014e CD |
759 | register struct flock_args /* { |
760 | syscallarg(int) fd; | |
761 | syscallarg(int) how; | |
762 | } */ *uap; | |
763 | register_t *retval; | |
a53a698b | 764 | { |
29e5014e CD |
765 | int fd = SCARG(uap, fd); |
766 | int how = SCARG(uap, how); | |
5e00df3b | 767 | register struct filedesc *fdp = p->p_fd; |
92438dfc | 768 | register struct file *fp; |
a4128336 KM |
769 | struct vnode *vp; |
770 | struct flock lf; | |
92438dfc | 771 | |
29e5014e CD |
772 | if ((u_int)fd >= fdp->fd_nfiles || |
773 | (fp = fdp->fd_ofiles[fd]) == NULL) | |
d9c2f47f | 774 | return (EBADF); |
a53a698b | 775 | if (fp->f_type != DTYPE_VNODE) |
d9c2f47f | 776 | return (EOPNOTSUPP); |
a4128336 KM |
777 | vp = (struct vnode *)fp->f_data; |
778 | lf.l_whence = SEEK_SET; | |
779 | lf.l_start = 0; | |
780 | lf.l_len = 0; | |
29e5014e | 781 | if (how & LOCK_UN) { |
a4128336 | 782 | lf.l_type = F_UNLCK; |
9bd5ee04 | 783 | fp->f_flag &= ~FHASLOCK; |
208eb71b | 784 | return (VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK)); |
92438dfc | 785 | } |
29e5014e | 786 | if (how & LOCK_EX) |
a4128336 | 787 | lf.l_type = F_WRLCK; |
29e5014e | 788 | else if (how & LOCK_SH) |
a4128336 KM |
789 | lf.l_type = F_RDLCK; |
790 | else | |
791 | return (EBADF); | |
9bd5ee04 | 792 | fp->f_flag |= FHASLOCK; |
29e5014e | 793 | if (how & LOCK_NB) |
208eb71b KM |
794 | return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK)); |
795 | return (VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, F_FLOCK|F_WAIT)); | |
92438dfc | 796 | } |
75ebd8c9 MT |
797 | |
798 | /* | |
799 | * File Descriptor pseudo-device driver (/dev/fd/). | |
800 | * | |
75ebd8c9 MT |
801 | * Opening minor device N dup()s the file (if any) connected to file |
802 | * descriptor N belonging to the calling process. Note that this driver | |
803 | * consists of only the ``open()'' routine, because all subsequent | |
804 | * references to this file will be direct to the other driver. | |
805 | */ | |
c4ec2128 | 806 | /* ARGSUSED */ |
29e5014e | 807 | int |
b640277d | 808 | fdopen(dev, mode, type, p) |
75ebd8c9 | 809 | dev_t dev; |
c4ec2128 | 810 | int mode, type; |
b640277d | 811 | struct proc *p; |
75ebd8c9 | 812 | { |
75ebd8c9 MT |
813 | |
814 | /* | |
8429d022 | 815 | * XXX Kludge: set curproc->p_dupfd to contain the value of the |
1105efe2 KM |
816 | * the file descriptor being sought for duplication. The error |
817 | * return ensures that the vnode for this device will be released | |
818 | * by vn_open. Open will detect this special error and take the | |
819 | * actions in dupfdopen below. Other callers of vn_open or VOP_OPEN | |
820 | * will simply report the error. | |
75ebd8c9 | 821 | */ |
b640277d | 822 | p->p_dupfd = minor(dev); |
1105efe2 KM |
823 | return (ENODEV); |
824 | } | |
e99d5db8 | 825 | |
1105efe2 KM |
826 | /* |
827 | * Duplicate the specified descriptor to a free descriptor. | |
828 | */ | |
29e5014e | 829 | int |
d1c3140e | 830 | dupfdopen(fdp, indx, dfd, mode, error) |
5e00df3b | 831 | register struct filedesc *fdp; |
1105efe2 KM |
832 | register int indx, dfd; |
833 | int mode; | |
d1c3140e | 834 | int error; |
1105efe2 KM |
835 | { |
836 | register struct file *wfp; | |
837 | struct file *fp; | |
29e5014e | 838 | |
75ebd8c9 | 839 | /* |
1105efe2 KM |
840 | * If the to-be-dup'd fd number is greater than the allowed number |
841 | * of file descriptors, or the fd to be dup'd has already been | |
842 | * closed, reject. Note, check for new == old is necessary as | |
843 | * falloc could allocate an already closed to-be-dup'd descriptor | |
844 | * as the new descriptor. | |
75ebd8c9 | 845 | */ |
7ddc4f96 MK |
846 | fp = fdp->fd_ofiles[indx]; |
847 | if ((u_int)dfd >= fdp->fd_nfiles || | |
848 | (wfp = fdp->fd_ofiles[dfd]) == NULL || fp == wfp) | |
75ebd8c9 | 849 | return (EBADF); |
e99d5db8 | 850 | |
75ebd8c9 | 851 | /* |
d1c3140e JSP |
852 | * There are two cases of interest here. |
853 | * | |
854 | * For ENODEV simply dup (dfd) to file descriptor | |
855 | * (indx) and return. | |
856 | * | |
857 | * For ENXIO steal away the file structure from (dfd) and | |
858 | * store it in (indx). (dfd) is effectively closed by | |
859 | * this operation. | |
860 | * | |
861 | * Any other error code is just returned. | |
75ebd8c9 | 862 | */ |
d1c3140e JSP |
863 | switch (error) { |
864 | case ENODEV: | |
865 | /* | |
866 | * Check that the mode the file is being opened for is a | |
867 | * subset of the mode of the existing descriptor. | |
868 | */ | |
869 | if (((mode & (FREAD|FWRITE)) | wfp->f_flag) != wfp->f_flag) | |
870 | return (EACCES); | |
871 | fdp->fd_ofiles[indx] = wfp; | |
872 | fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd]; | |
873 | wfp->f_count++; | |
874 | if (indx > fdp->fd_lastfile) | |
875 | fdp->fd_lastfile = indx; | |
876 | return (0); | |
877 | ||
878 | case ENXIO: | |
879 | /* | |
880 | * Steal away the file pointer from dfd, and stuff it into indx. | |
881 | */ | |
882 | fdp->fd_ofiles[indx] = fdp->fd_ofiles[dfd]; | |
883 | fdp->fd_ofiles[dfd] = NULL; | |
884 | fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd]; | |
885 | fdp->fd_ofileflags[dfd] = 0; | |
886 | /* | |
887 | * Complete the clean up of the filedesc structure by | |
888 | * recomputing the various hints. | |
889 | */ | |
890 | if (indx > fdp->fd_lastfile) | |
891 | fdp->fd_lastfile = indx; | |
892 | else | |
893 | while (fdp->fd_lastfile > 0 && | |
894 | fdp->fd_ofiles[fdp->fd_lastfile] == NULL) | |
895 | fdp->fd_lastfile--; | |
896 | if (dfd < fdp->fd_freefile) | |
897 | fdp->fd_freefile = dfd; | |
898 | return (0); | |
899 | ||
900 | default: | |
901 | return (error); | |
902 | } | |
903 | /* NOTREACHED */ | |
75ebd8c9 | 904 | } |