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/arch/um/os-Linux/file.c

https://bitbucket.org/ndreys/linux-sunxi
C | 578 lines | 462 code | 110 blank | 6 comment | 98 complexity | 2d654abd3f5b1f228e7687f66689353c MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  3 * Licensed under the GPL
  4 */
  5
  6#include <stdio.h>
  7#include <unistd.h>
  8#include <errno.h>
  9#include <fcntl.h>
 10#include <signal.h>
 11#include <sys/ioctl.h>
 12#include <sys/mount.h>
 13#include <sys/socket.h>
 14#include <sys/stat.h>
 15#include <sys/un.h>
 16#include "kern_constants.h"
 17#include "os.h"
 18#include "user.h"
 19
 20static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
 21{
 22	*dst = ((struct uml_stat) {
 23		.ust_dev     = src->st_dev,     /* device */
 24		.ust_ino     = src->st_ino,     /* inode */
 25		.ust_mode    = src->st_mode,    /* protection */
 26		.ust_nlink   = src->st_nlink,   /* number of hard links */
 27		.ust_uid     = src->st_uid,     /* user ID of owner */
 28		.ust_gid     = src->st_gid,     /* group ID of owner */
 29		.ust_size    = src->st_size,    /* total size, in bytes */
 30		.ust_blksize = src->st_blksize, /* blocksize for filesys I/O */
 31		.ust_blocks  = src->st_blocks,  /* number of blocks allocated */
 32		.ust_atime   = src->st_atime,   /* time of last access */
 33		.ust_mtime   = src->st_mtime,   /* time of last modification */
 34		.ust_ctime   = src->st_ctime,   /* time of last change */
 35	});
 36}
 37
 38int os_stat_fd(const int fd, struct uml_stat *ubuf)
 39{
 40	struct stat64 sbuf;
 41	int err;
 42
 43	CATCH_EINTR(err = fstat64(fd, &sbuf));
 44	if (err < 0)
 45		return -errno;
 46
 47	if (ubuf != NULL)
 48		copy_stat(ubuf, &sbuf);
 49	return err;
 50}
 51
 52int os_stat_file(const char *file_name, struct uml_stat *ubuf)
 53{
 54	struct stat64 sbuf;
 55	int err;
 56
 57	CATCH_EINTR(err = stat64(file_name, &sbuf));
 58	if (err < 0)
 59		return -errno;
 60
 61	if (ubuf != NULL)
 62		copy_stat(ubuf, &sbuf);
 63	return err;
 64}
 65
 66int os_access(const char *file, int mode)
 67{
 68	int amode, err;
 69
 70	amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
 71		(mode & OS_ACC_W_OK ? W_OK : 0) |
 72		(mode & OS_ACC_X_OK ? X_OK : 0) |
 73		(mode & OS_ACC_F_OK ? F_OK : 0);
 74
 75	err = access(file, amode);
 76	if (err < 0)
 77		return -errno;
 78
 79	return 0;
 80}
 81
 82/* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
 83int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
 84{
 85	int err;
 86
 87	err = ioctl(fd, cmd, arg);
 88	if (err < 0)
 89		return -errno;
 90
 91	return err;
 92}
 93
 94/* FIXME: ensure namebuf in os_get_if_name is big enough */
 95int os_get_ifname(int fd, char* namebuf)
 96{
 97	if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
 98		return -errno;
 99
100	return 0;
101}
102
103int os_set_slip(int fd)
104{
105	int disc, sencap;
106
107	disc = N_SLIP;
108	if (ioctl(fd, TIOCSETD, &disc) < 0)
109		return -errno;
110
111	sencap = 0;
112	if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
113		return -errno;
114
115	return 0;
116}
117
118int os_mode_fd(int fd, int mode)
119{
120	int err;
121
122	CATCH_EINTR(err = fchmod(fd, mode));
123	if (err < 0)
124		return -errno;
125
126	return 0;
127}
128
129int os_file_type(char *file)
130{
131	struct uml_stat buf;
132	int err;
133
134	err = os_stat_file(file, &buf);
135	if (err < 0)
136		return err;
137
138	if (S_ISDIR(buf.ust_mode))
139		return OS_TYPE_DIR;
140	else if (S_ISLNK(buf.ust_mode))
141		return OS_TYPE_SYMLINK;
142	else if (S_ISCHR(buf.ust_mode))
143		return OS_TYPE_CHARDEV;
144	else if (S_ISBLK(buf.ust_mode))
145		return OS_TYPE_BLOCKDEV;
146	else if (S_ISFIFO(buf.ust_mode))
147		return OS_TYPE_FIFO;
148	else if (S_ISSOCK(buf.ust_mode))
149		return OS_TYPE_SOCK;
150	else return OS_TYPE_FILE;
151}
152
153int os_file_mode(const char *file, struct openflags *mode_out)
154{
155	int err;
156
157	*mode_out = OPENFLAGS();
158
159	err = access(file, W_OK);
160	if (err && (errno != EACCES))
161		return -errno;
162	else if (!err)
163		*mode_out = of_write(*mode_out);
164
165	err = access(file, R_OK);
166	if (err && (errno != EACCES))
167		return -errno;
168	else if (!err)
169		*mode_out = of_read(*mode_out);
170
171	return err;
172}
173
174int os_open_file(const char *file, struct openflags flags, int mode)
175{
176	int fd, err, f = 0;
177
178	if (flags.r && flags.w)
179		f = O_RDWR;
180	else if (flags.r)
181		f = O_RDONLY;
182	else if (flags.w)
183		f = O_WRONLY;
184	else f = 0;
185
186	if (flags.s)
187		f |= O_SYNC;
188	if (flags.c)
189		f |= O_CREAT;
190	if (flags.t)
191		f |= O_TRUNC;
192	if (flags.e)
193		f |= O_EXCL;
194	if (flags.a)
195		f |= O_APPEND;
196
197	fd = open64(file, f, mode);
198	if (fd < 0)
199		return -errno;
200
201	if (flags.cl && fcntl(fd, F_SETFD, 1)) {
202		err = -errno;
203		close(fd);
204		return err;
205	}
206
207	return fd;
208}
209
210int os_connect_socket(const char *name)
211{
212	struct sockaddr_un sock;
213	int fd, err;
214
215	sock.sun_family = AF_UNIX;
216	snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
217
218	fd = socket(AF_UNIX, SOCK_STREAM, 0);
219	if (fd < 0) {
220		err = -errno;
221		goto out;
222	}
223
224	err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
225	if (err) {
226		err = -errno;
227		goto out_close;
228	}
229
230	return fd;
231
232out_close:
233	close(fd);
234out:
235	return err;
236}
237
238void os_close_file(int fd)
239{
240	close(fd);
241}
242
243int os_seek_file(int fd, unsigned long long offset)
244{
245	unsigned long long actual;
246
247	actual = lseek64(fd, offset, SEEK_SET);
248	if (actual != offset)
249		return -errno;
250	return 0;
251}
252
253int os_read_file(int fd, void *buf, int len)
254{
255	int n = read(fd, buf, len);
256
257	if (n < 0)
258		return -errno;
259	return n;
260}
261
262int os_write_file(int fd, const void *buf, int len)
263{
264	int n = write(fd, (void *) buf, len);
265
266	if (n < 0)
267		return -errno;
268	return n;
269}
270
271int os_file_size(const char *file, unsigned long long *size_out)
272{
273	struct uml_stat buf;
274	int err;
275
276	err = os_stat_file(file, &buf);
277	if (err < 0) {
278		printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
279		       -err);
280		return err;
281	}
282
283	if (S_ISBLK(buf.ust_mode)) {
284		int fd;
285		long blocks;
286
287		fd = open(file, O_RDONLY, 0);
288		if (fd < 0) {
289			err = -errno;
290			printk(UM_KERN_ERR "Couldn't open \"%s\", "
291			       "errno = %d\n", file, errno);
292			return err;
293		}
294		if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
295			err = -errno;
296			printk(UM_KERN_ERR "Couldn't get the block size of "
297			       "\"%s\", errno = %d\n", file, errno);
298			close(fd);
299			return err;
300		}
301		*size_out = ((long long) blocks) * 512;
302		close(fd);
303	}
304	else *size_out = buf.ust_size;
305
306	return 0;
307}
308
309int os_file_modtime(const char *file, unsigned long *modtime)
310{
311	struct uml_stat buf;
312	int err;
313
314	err = os_stat_file(file, &buf);
315	if (err < 0) {
316		printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
317		       -err);
318		return err;
319	}
320
321	*modtime = buf.ust_mtime;
322	return 0;
323}
324
325int os_set_exec_close(int fd)
326{
327	int err;
328
329	CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
330
331	if (err < 0)
332		return -errno;
333	return err;
334}
335
336int os_pipe(int *fds, int stream, int close_on_exec)
337{
338	int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
339
340	err = socketpair(AF_UNIX, type, 0, fds);
341	if (err < 0)
342		return -errno;
343
344	if (!close_on_exec)
345		return 0;
346
347	err = os_set_exec_close(fds[0]);
348	if (err < 0)
349		goto error;
350
351	err = os_set_exec_close(fds[1]);
352	if (err < 0)
353		goto error;
354
355	return 0;
356
357 error:
358	printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
359	       -err);
360	close(fds[1]);
361	close(fds[0]);
362	return err;
363}
364
365int os_set_fd_async(int fd)
366{
367	int err, flags;
368
369	flags = fcntl(fd, F_GETFL);
370	if (flags < 0)
371		return -errno;
372
373	flags |= O_ASYNC | O_NONBLOCK;
374	if (fcntl(fd, F_SETFL, flags) < 0) {
375		err = -errno;
376		printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
377		       "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
378		return err;
379	}
380
381	if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
382	    (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
383		err = -errno;
384		printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
385		       "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
386		return err;
387	}
388
389	return 0;
390}
391
392int os_clear_fd_async(int fd)
393{
394	int flags;
395
396	flags = fcntl(fd, F_GETFL);
397	if (flags < 0)
398		return -errno;
399
400	flags &= ~(O_ASYNC | O_NONBLOCK);
401	if (fcntl(fd, F_SETFL, flags) < 0)
402		return -errno;
403	return 0;
404}
405
406int os_set_fd_block(int fd, int blocking)
407{
408	int flags;
409
410	flags = fcntl(fd, F_GETFL);
411	if (flags < 0)
412		return -errno;
413
414	if (blocking)
415		flags &= ~O_NONBLOCK;
416	else
417		flags |= O_NONBLOCK;
418
419	if (fcntl(fd, F_SETFL, flags) < 0)
420		return -errno;
421
422	return 0;
423}
424
425int os_accept_connection(int fd)
426{
427	int new;
428
429	new = accept(fd, NULL, 0);
430	if (new < 0)
431		return -errno;
432	return new;
433}
434
435#ifndef SHUT_RD
436#define SHUT_RD 0
437#endif
438
439#ifndef SHUT_WR
440#define SHUT_WR 1
441#endif
442
443#ifndef SHUT_RDWR
444#define SHUT_RDWR 2
445#endif
446
447int os_shutdown_socket(int fd, int r, int w)
448{
449	int what, err;
450
451	if (r && w)
452		what = SHUT_RDWR;
453	else if (r)
454		what = SHUT_RD;
455	else if (w)
456		what = SHUT_WR;
457	else
458		return -EINVAL;
459
460	err = shutdown(fd, what);
461	if (err < 0)
462		return -errno;
463	return 0;
464}
465
466int os_rcv_fd(int fd, int *helper_pid_out)
467{
468	int new, n;
469	char buf[CMSG_SPACE(sizeof(new))];
470	struct msghdr msg;
471	struct cmsghdr *cmsg;
472	struct iovec iov;
473
474	msg.msg_name = NULL;
475	msg.msg_namelen = 0;
476	iov = ((struct iovec) { .iov_base  = helper_pid_out,
477				.iov_len   = sizeof(*helper_pid_out) });
478	msg.msg_iov = &iov;
479	msg.msg_iovlen = 1;
480	msg.msg_control = buf;
481	msg.msg_controllen = sizeof(buf);
482	msg.msg_flags = 0;
483
484	n = recvmsg(fd, &msg, 0);
485	if (n < 0)
486		return -errno;
487	else if (n != iov.iov_len)
488		*helper_pid_out = -1;
489
490	cmsg = CMSG_FIRSTHDR(&msg);
491	if (cmsg == NULL) {
492		printk(UM_KERN_ERR "rcv_fd didn't receive anything, "
493		       "error = %d\n", errno);
494		return -1;
495	}
496	if ((cmsg->cmsg_level != SOL_SOCKET) ||
497	    (cmsg->cmsg_type != SCM_RIGHTS)) {
498		printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n");
499		return -1;
500	}
501
502	new = ((int *) CMSG_DATA(cmsg))[0];
503	return new;
504}
505
506int os_create_unix_socket(const char *file, int len, int close_on_exec)
507{
508	struct sockaddr_un addr;
509	int sock, err;
510
511	sock = socket(PF_UNIX, SOCK_DGRAM, 0);
512	if (sock < 0)
513		return -errno;
514
515	if (close_on_exec) {
516		err = os_set_exec_close(sock);
517		if (err < 0)
518			printk(UM_KERN_ERR "create_unix_socket : "
519			       "close_on_exec failed, err = %d", -err);
520	}
521
522	addr.sun_family = AF_UNIX;
523
524	snprintf(addr.sun_path, len, "%s", file);
525
526	err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
527	if (err < 0)
528		return -errno;
529
530	return sock;
531}
532
533void os_flush_stdout(void)
534{
535	fflush(stdout);
536}
537
538int os_lock_file(int fd, int excl)
539{
540	int type = excl ? F_WRLCK : F_RDLCK;
541	struct flock lock = ((struct flock) { .l_type	= type,
542					      .l_whence	= SEEK_SET,
543					      .l_start	= 0,
544					      .l_len	= 0 } );
545	int err, save;
546
547	err = fcntl(fd, F_SETLK, &lock);
548	if (!err)
549		goto out;
550
551	save = -errno;
552	err = fcntl(fd, F_GETLK, &lock);
553	if (err) {
554		err = -errno;
555		goto out;
556	}
557
558	printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
559	       lock.l_pid);
560	err = save;
561 out:
562	return err;
563}
564
565unsigned os_major(unsigned long long dev)
566{
567	return major(dev);
568}
569
570unsigned os_minor(unsigned long long dev)
571{
572	return minor(dev);
573}
574
575unsigned long long os_makedev(unsigned major, unsigned minor)
576{
577	return makedev(major, minor);
578}