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

https://bitbucket.org/evzijst/gittest
C | 680 lines | 529 code | 132 blank | 19 comment | 124 complexity | 2e8680560fd15d50b389c11fa2b9a9d0 MD5 | raw file
  1/* 
  2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.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/types.h>
 12#include <sys/stat.h>
 13#include <sys/socket.h>
 14#include <sys/un.h>
 15#include <sys/ioctl.h>
 16#include <sys/mount.h>
 17#include <sys/uio.h>
 18#include "os.h"
 19#include "user.h"
 20#include "kern_util.h"
 21
 22static void copy_stat(struct uml_stat *dst, struct stat64 *src)
 23{
 24	*dst = ((struct uml_stat) {
 25		.ust_dev     = src->st_dev,     /* device */
 26		.ust_ino     = src->st_ino,     /* inode */
 27		.ust_mode    = src->st_mode,    /* protection */
 28		.ust_nlink   = src->st_nlink,   /* number of hard links */
 29		.ust_uid     = src->st_uid,     /* user ID of owner */
 30		.ust_gid     = src->st_gid,     /* group ID of owner */
 31		.ust_size    = src->st_size,    /* total size, in bytes */
 32		.ust_blksize = src->st_blksize, /* blocksize for filesys I/O */
 33		.ust_blocks  = src->st_blocks,  /* number of blocks allocated */
 34		.ust_atime   = src->st_atime,   /* time of last access */
 35		.ust_mtime   = src->st_mtime,   /* time of last modification */
 36		.ust_ctime   = src->st_ctime,   /* time of last change */
 37	});
 38}
 39
 40int os_stat_fd(const int fd, struct uml_stat *ubuf)
 41{
 42	struct stat64 sbuf;
 43	int err;
 44
 45	do {
 46		err = fstat64(fd, &sbuf);
 47	} while((err < 0) && (errno == EINTR)) ;
 48
 49	if(err < 0)
 50		return(-errno);
 51
 52	if(ubuf != NULL)
 53		copy_stat(ubuf, &sbuf);
 54	return(err);
 55}
 56
 57int os_stat_file(const char *file_name, struct uml_stat *ubuf)
 58{
 59	struct stat64 sbuf;
 60	int err;
 61
 62	do {
 63		err = stat64(file_name, &sbuf);
 64	} while((err < 0) && (errno == EINTR)) ;
 65
 66	if(err < 0)
 67		return(-errno);
 68
 69	if(ubuf != NULL)
 70		copy_stat(ubuf, &sbuf);
 71	return(err);
 72}
 73
 74int os_access(const char* file, int mode)
 75{
 76	int amode, err;
 77
 78	amode=(mode&OS_ACC_R_OK ? R_OK : 0) | (mode&OS_ACC_W_OK ? W_OK : 0) |
 79	      (mode&OS_ACC_X_OK ? X_OK : 0) | (mode&OS_ACC_F_OK ? F_OK : 0) ;
 80
 81	err = access(file, amode);
 82	if(err < 0)
 83		return(-errno);
 84
 85	return(0);
 86}
 87
 88void os_print_error(int error, const char* str)
 89{
 90	errno = error < 0 ? -error : error;
 91
 92	perror(str);
 93}
 94
 95/* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
 96int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
 97{
 98	int err;
 99
100	err = ioctl(fd, cmd, arg);
101	if(err < 0)
102		return(-errno);
103
104	return(err);
105}
106
107int os_window_size(int fd, int *rows, int *cols)
108{
109	struct winsize size;
110
111	if(ioctl(fd, TIOCGWINSZ, &size) < 0)
112		return(-errno);
113
114	*rows = size.ws_row;
115	*cols = size.ws_col;
116
117	return(0);
118}
119
120int os_new_tty_pgrp(int fd, int pid)
121{
122	if(ioctl(fd, TIOCSCTTY, 0) < 0){
123		printk("TIOCSCTTY failed, errno = %d\n", errno);
124		return(-errno);
125	}
126
127	if(tcsetpgrp(fd, pid) < 0){
128		printk("tcsetpgrp failed, errno = %d\n", errno);
129		return(-errno);
130	}
131
132	return(0);
133}
134
135/* FIXME: ensure namebuf in os_get_if_name is big enough */
136int os_get_ifname(int fd, char* namebuf)
137{
138	if(ioctl(fd, SIOCGIFNAME, namebuf) < 0)
139		return(-errno);
140
141	return(0);
142}
143
144int os_set_slip(int fd)
145{
146	int disc, sencap;
147
148	disc = N_SLIP;
149	if(ioctl(fd, TIOCSETD, &disc) < 0){
150		printk("Failed to set slip line discipline - "
151		       "errno = %d\n", errno);
152		return(-errno);
153	}
154
155	sencap = 0;
156	if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0){
157		printk("Failed to set slip encapsulation - "
158		       "errno = %d\n", errno);
159		return(-errno);
160	}
161
162	return(0);
163}
164
165int os_set_owner(int fd, int pid)
166{
167	if(fcntl(fd, F_SETOWN, pid) < 0){
168		int save_errno = errno;
169
170		if(fcntl(fd, F_GETOWN, 0) != pid)
171			return(-save_errno);
172	}
173
174	return(0);
175}
176
177/* FIXME? moved wholesale from sigio_user.c to get fcntls out of that file */
178int os_sigio_async(int master, int slave)
179{
180	int flags;
181
182	flags = fcntl(master, F_GETFL);
183	if(flags < 0) {
184		printk("fcntl F_GETFL failed, errno = %d\n", errno);
185		return(-errno);
186	}
187
188	if((fcntl(master, F_SETFL, flags | O_NONBLOCK | O_ASYNC) < 0) ||
189	   (fcntl(master, F_SETOWN, os_getpid()) < 0)){
190		printk("fcntl F_SETFL or F_SETOWN failed, errno = %d\n",
191		       errno);
192		return(-errno);
193	}
194
195	if((fcntl(slave, F_SETFL, flags | O_NONBLOCK) < 0)){
196		printk("fcntl F_SETFL failed, errno = %d\n", errno);
197		return(-errno);
198	}
199
200	return(0);
201}
202
203int os_mode_fd(int fd, int mode)
204{
205	int err;
206
207	do {
208		err = fchmod(fd, mode);
209	} while((err < 0) && (errno==EINTR)) ;
210
211	if(err < 0)
212		return(-errno);
213
214	return(0);
215}
216
217int os_file_type(char *file)
218{
219	struct uml_stat buf;
220	int err;
221
222	err = os_stat_file(file, &buf);
223	if(err < 0)
224		return(err);
225
226	if(S_ISDIR(buf.ust_mode)) return(OS_TYPE_DIR);
227	else if(S_ISLNK(buf.ust_mode)) return(OS_TYPE_SYMLINK);
228	else if(S_ISCHR(buf.ust_mode)) return(OS_TYPE_CHARDEV);
229	else if(S_ISBLK(buf.ust_mode)) return(OS_TYPE_BLOCKDEV);
230	else if(S_ISFIFO(buf.ust_mode)) return(OS_TYPE_FIFO);
231	else if(S_ISSOCK(buf.ust_mode)) return(OS_TYPE_SOCK);
232	else return(OS_TYPE_FILE);
233}
234
235int os_file_mode(char *file, struct openflags *mode_out)
236{
237	int err;
238
239	*mode_out = OPENFLAGS();
240
241	err = os_access(file, OS_ACC_W_OK);
242	if((err < 0) && (err != -EACCES))
243		return(err);
244
245	*mode_out = of_write(*mode_out);
246
247	err = os_access(file, OS_ACC_R_OK);
248	if((err < 0) && (err != -EACCES))
249		return(err);
250
251	*mode_out = of_read(*mode_out);
252
253	return(0);
254}
255
256int os_open_file(char *file, struct openflags flags, int mode)
257{
258	int fd, f = 0;
259
260	if(flags.r && flags.w) f = O_RDWR;
261	else if(flags.r) f = O_RDONLY;
262	else if(flags.w) f = O_WRONLY;
263	else f = 0;
264
265	if(flags.s) f |= O_SYNC;
266	if(flags.c) f |= O_CREAT;
267	if(flags.t) f |= O_TRUNC;
268	if(flags.e) f |= O_EXCL;
269
270	fd = open64(file, f, mode);
271	if(fd < 0)
272		return(-errno);
273
274	if(flags.cl && fcntl(fd, F_SETFD, 1)){
275		os_close_file(fd);
276		return(-errno);
277	}
278
279	return(fd);
280}
281
282int os_connect_socket(char *name)
283{
284	struct sockaddr_un sock;
285	int fd, err;
286
287	sock.sun_family = AF_UNIX;
288	snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
289
290	fd = socket(AF_UNIX, SOCK_STREAM, 0);
291	if(fd < 0)
292		return(fd);
293
294	err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
295	if(err)
296		return(-errno);
297
298	return(fd);
299}
300
301void os_close_file(int fd)
302{
303	close(fd);
304}
305
306int os_seek_file(int fd, __u64 offset)
307{
308	__u64 actual;
309
310	actual = lseek64(fd, offset, SEEK_SET);
311	if(actual != offset)
312		return(-errno);
313	return(0);
314}
315
316static int fault_buffer(void *start, int len,
317			int (*copy_proc)(void *addr, void *buf, int len))
318{
319	int page = getpagesize(), i;
320	char c;
321
322	for(i = 0; i < len; i += page){
323		if((*copy_proc)(start + i, &c, sizeof(c)))
324			return(-EFAULT);
325	}
326	if((len % page) != 0){
327		if((*copy_proc)(start + len - 1, &c, sizeof(c)))
328			return(-EFAULT);
329	}
330	return(0);
331}
332
333static int file_io(int fd, void *buf, int len,
334		   int (*io_proc)(int fd, void *buf, int len),
335		   int (*copy_user_proc)(void *addr, void *buf, int len))
336{
337	int n, err;
338
339	do {
340		n = (*io_proc)(fd, buf, len);
341		if((n < 0) && (errno == EFAULT)){
342			err = fault_buffer(buf, len, copy_user_proc);
343			if(err)
344				return(err);
345			n = (*io_proc)(fd, buf, len);
346		}
347	} while((n < 0) && (errno == EINTR));
348
349	if(n < 0)
350		return(-errno);
351	return(n);
352}
353
354int os_read_file(int fd, void *buf, int len)
355{
356	return(file_io(fd, buf, len, (int (*)(int, void *, int)) read,
357		       copy_from_user_proc));
358}
359
360int os_write_file(int fd, const void *buf, int len)
361{
362	return(file_io(fd, (void *) buf, len,
363		       (int (*)(int, void *, int)) write, copy_to_user_proc));
364}
365
366int os_file_size(char *file, long long *size_out)
367{
368	struct uml_stat buf;
369	int err;
370
371	err = os_stat_file(file, &buf);
372	if(err < 0){
373		printk("Couldn't stat \"%s\" : err = %d\n", file, -err);
374		return(err);
375	}
376
377	if(S_ISBLK(buf.ust_mode)){
378		int fd, blocks;
379
380		fd = os_open_file(file, of_read(OPENFLAGS()), 0);
381		if(fd < 0){
382			printk("Couldn't open \"%s\", errno = %d\n", file, -fd);
383			return(fd);
384		}
385		if(ioctl(fd, BLKGETSIZE, &blocks) < 0){
386			printk("Couldn't get the block size of \"%s\", "
387			       "errno = %d\n", file, errno);
388			err = -errno;
389			os_close_file(fd);
390			return(err);
391		}
392		*size_out = ((long long) blocks) * 512;
393		os_close_file(fd);
394		return(0);
395	}
396	*size_out = buf.ust_size;
397	return(0);
398}
399
400int os_file_modtime(char *file, unsigned long *modtime)
401{
402	struct uml_stat buf;
403	int err;
404
405	err = os_stat_file(file, &buf);
406	if(err < 0){
407		printk("Couldn't stat \"%s\" : err = %d\n", file, -err);
408		return(err);
409	}
410
411	*modtime = buf.ust_mtime;
412	return(0);
413}
414
415int os_get_exec_close(int fd, int* close_on_exec)
416{
417	int ret;
418
419	do {
420		ret = fcntl(fd, F_GETFD);
421	} while((ret < 0) && (errno == EINTR)) ;
422
423	if(ret < 0)
424		return(-errno);
425
426	*close_on_exec = (ret&FD_CLOEXEC) ? 1 : 0;
427	return(ret);
428}
429
430int os_set_exec_close(int fd, int close_on_exec)
431{
432	int flag, err;
433
434	if(close_on_exec) flag = FD_CLOEXEC;
435	else flag = 0;
436
437	do {
438		err = fcntl(fd, F_SETFD, flag);
439	} while((err < 0) && (errno == EINTR)) ;
440
441	if(err < 0)
442		return(-errno);
443	return(err);
444}
445
446int os_pipe(int *fds, int stream, int close_on_exec)
447{
448	int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
449
450	err = socketpair(AF_UNIX, type, 0, fds);
451	if(err < 0)
452		return(-errno);
453
454	if(!close_on_exec)
455		return(0);
456
457	err = os_set_exec_close(fds[0], 1);
458	if(err < 0)
459		goto error;
460
461	err = os_set_exec_close(fds[1], 1);
462	if(err < 0)
463		goto error;
464
465	return(0);
466
467 error:
468	printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err);
469	os_close_file(fds[1]);
470	os_close_file(fds[0]);
471	return(err);
472}
473
474int os_set_fd_async(int fd, int owner)
475{
476	/* XXX This should do F_GETFL first */
477	if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){
478		printk("os_set_fd_async : failed to set O_ASYNC and "
479		       "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
480		return(-errno);
481	}
482#ifdef notdef
483	if(fcntl(fd, F_SETFD, 1) < 0){
484		printk("os_set_fd_async : Setting FD_CLOEXEC failed, "
485		       "errno = %d\n", errno);
486	}
487#endif
488
489	if((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
490	   (fcntl(fd, F_SETOWN, owner) < 0)){
491		printk("os_set_fd_async : Failed to fcntl F_SETOWN "
492		       "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd, 
493		       owner, errno);
494		return(-errno);
495	}
496
497	return(0);
498}
499
500int os_clear_fd_async(int fd)
501{
502	int flags = fcntl(fd, F_GETFL);
503
504	flags &= ~(O_ASYNC | O_NONBLOCK);
505	if(fcntl(fd, F_SETFL, flags) < 0)
506		return(-errno);
507	return(0);
508}
509
510int os_set_fd_block(int fd, int blocking)
511{
512	int flags;
513
514	flags = fcntl(fd, F_GETFL);
515
516	if(blocking) flags &= ~O_NONBLOCK;
517	else flags |= O_NONBLOCK;
518
519	if(fcntl(fd, F_SETFL, flags) < 0){
520		printk("Failed to change blocking on fd # %d, errno = %d\n",
521		       fd, errno);
522		return(-errno);
523	}
524	return(0);
525}
526
527int os_accept_connection(int fd)
528{
529	int new;
530
531	new = accept(fd, NULL, 0);
532	if(new < 0) 
533		return(-errno);
534	return(new);
535}
536
537#ifndef SHUT_RD
538#define SHUT_RD 0
539#endif
540
541#ifndef SHUT_WR
542#define SHUT_WR 1
543#endif
544
545#ifndef SHUT_RDWR
546#define SHUT_RDWR 2
547#endif
548
549int os_shutdown_socket(int fd, int r, int w)
550{
551	int what, err;
552
553	if(r && w) what = SHUT_RDWR;
554	else if(r) what = SHUT_RD;
555	else if(w) what = SHUT_WR;
556	else {
557		printk("os_shutdown_socket : neither r or w was set\n");
558		return(-EINVAL);
559	}
560	err = shutdown(fd, what);
561	if(err < 0)
562		return(-errno);
563	return(0);
564}
565
566int os_rcv_fd(int fd, int *helper_pid_out)
567{
568	int new, n;
569	char buf[CMSG_SPACE(sizeof(new))];
570	struct msghdr msg;
571	struct cmsghdr *cmsg;
572	struct iovec iov;
573
574	msg.msg_name = NULL;
575	msg.msg_namelen = 0;
576	iov = ((struct iovec) { .iov_base  = helper_pid_out,
577				.iov_len   = sizeof(*helper_pid_out) });
578	msg.msg_iov = &iov;
579	msg.msg_iovlen = 1;
580	msg.msg_control = buf;
581	msg.msg_controllen = sizeof(buf);
582	msg.msg_flags = 0;
583
584	n = recvmsg(fd, &msg, 0);
585	if(n < 0)
586		return(-errno);
587
588	else if(n != sizeof(iov.iov_len))
589		*helper_pid_out = -1;
590
591	cmsg = CMSG_FIRSTHDR(&msg);
592	if(cmsg == NULL){
593		printk("rcv_fd didn't receive anything, error = %d\n", errno);
594		return(-1);
595	}
596	if((cmsg->cmsg_level != SOL_SOCKET) || 
597	   (cmsg->cmsg_type != SCM_RIGHTS)){
598		printk("rcv_fd didn't receive a descriptor\n");
599		return(-1);
600	}
601
602	new = ((int *) CMSG_DATA(cmsg))[0];
603	return(new);
604}
605
606int os_create_unix_socket(char *file, int len, int close_on_exec)
607{
608	struct sockaddr_un addr;
609	int sock, err;
610
611	sock = socket(PF_UNIX, SOCK_DGRAM, 0);
612	if (sock < 0){
613		printk("create_unix_socket - socket failed, errno = %d\n",
614		       errno);
615		return(-errno);
616	}
617
618	if(close_on_exec) {
619		err = os_set_exec_close(sock, 1);
620		if(err < 0)
621			printk("create_unix_socket : close_on_exec failed, "
622		       "err = %d", -err);
623	}
624
625	addr.sun_family = AF_UNIX;
626
627	/* XXX Be more careful about overflow */
628	snprintf(addr.sun_path, len, "%s", file);
629
630	err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
631	if (err < 0){
632		printk("create_listening_socket at '%s' - bind failed, "
633		       "errno = %d\n", file, errno);
634		return(-errno);
635	}
636
637	return(sock);
638}
639
640void os_flush_stdout(void)
641{
642	fflush(stdout);
643}
644
645int os_lock_file(int fd, int excl)
646{
647	int type = excl ? F_WRLCK : F_RDLCK;
648	struct flock lock = ((struct flock) { .l_type	= type,
649					      .l_whence	= SEEK_SET,
650					      .l_start	= 0,
651					      .l_len	= 0 } );
652	int err, save;
653
654	err = fcntl(fd, F_SETLK, &lock);
655	if(!err)
656		goto out;
657
658	save = -errno;
659	err = fcntl(fd, F_GETLK, &lock);
660	if(err){
661		err = -errno;
662		goto out;
663	}
664
665	printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid);
666	err = save;
667 out:
668	return(err);
669}
670
671/*
672 * Overrides for Emacs so that we follow Linus's tabbing style.
673 * Emacs will notice this stuff at the end of the file and automatically
674 * adjust the settings for this buffer only.  This must remain at the end
675 * of the file.
676 * ---------------------------------------------------------------------------
677 * Local variables:
678 * c-file-style: "linux"
679 * End:
680 */