[mirror_ubuntu-bionic-kernel.git] / arch / um / os-Linux / file.c

/*
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include "kern_constants.h"
#include "os.h"
#include "user.h"

static void copy_stat(struct uml_stat *dst, const struct stat64 *src)
{
	*dst = ((struct uml_stat) {
		.ust_dev     = src->st_dev,     /* device */
		.ust_ino     = src->st_ino,     /* inode */
		.ust_mode    = src->st_mode,    /* protection */
		.ust_nlink   = src->st_nlink,   /* number of hard links */
		.ust_uid     = src->st_uid,     /* user ID of owner */
		.ust_gid     = src->st_gid,     /* group ID of owner */
		.ust_size    = src->st_size,    /* total size, in bytes */
		.ust_blksize = src->st_blksize, /* blocksize for filesys I/O */
		.ust_blocks  = src->st_blocks,  /* number of blocks allocated */
		.ust_atime   = src->st_atime,   /* time of last access */
		.ust_mtime   = src->st_mtime,   /* time of last modification */
		.ust_ctime   = src->st_ctime,   /* time of last change */
	});
}

int os_stat_fd(const int fd, struct uml_stat *ubuf)
{
	struct stat64 sbuf;
	int err;

	CATCH_EINTR(err = fstat64(fd, &sbuf));
	if (err < 0)
		return -errno;

	if (ubuf != NULL)
		copy_stat(ubuf, &sbuf);
	return err;
}

int os_stat_file(const char *file_name, struct uml_stat *ubuf)
{
	struct stat64 sbuf;
	int err;

	CATCH_EINTR(err = stat64(file_name, &sbuf));
	if (err < 0)
		return -errno;

	if (ubuf != NULL)
		copy_stat(ubuf, &sbuf);
	return err;
}

int os_access(const char *file, int mode)
{
	int amode, err;

	amode = (mode & OS_ACC_R_OK ? R_OK : 0) |
		(mode & OS_ACC_W_OK ? W_OK : 0) |
		(mode & OS_ACC_X_OK ? X_OK : 0) |
		(mode & OS_ACC_F_OK ? F_OK : 0);

	err = access(file, amode);
	if (err < 0)
		return -errno;

	return 0;
}

/* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
{
	int err;

	err = ioctl(fd, cmd, arg);
	if (err < 0)
		return -errno;

	return err;
}

/* FIXME: ensure namebuf in os_get_if_name is big enough */
int os_get_ifname(int fd, char* namebuf)
{
	if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
		return -errno;

	return 0;
}

int os_set_slip(int fd)
{
	int disc, sencap;

	disc = N_SLIP;
	if (ioctl(fd, TIOCSETD, &disc) < 0)
		return -errno;

	sencap = 0;
	if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
		return -errno;

	return 0;
}

int os_mode_fd(int fd, int mode)
{
	int err;

	CATCH_EINTR(err = fchmod(fd, mode));
	if (err < 0)
		return -errno;

	return 0;
}

int os_file_type(char *file)
{
	struct uml_stat buf;
	int err;

	err = os_stat_file(file, &buf);
	if (err < 0)
		return err;

	if (S_ISDIR(buf.ust_mode))
		return OS_TYPE_DIR;
	else if (S_ISLNK(buf.ust_mode))
		return OS_TYPE_SYMLINK;
	else if (S_ISCHR(buf.ust_mode))
		return OS_TYPE_CHARDEV;
	else if (S_ISBLK(buf.ust_mode))
		return OS_TYPE_BLOCKDEV;
	else if (S_ISFIFO(buf.ust_mode))
		return OS_TYPE_FIFO;
	else if (S_ISSOCK(buf.ust_mode))
		return OS_TYPE_SOCK;
	else return OS_TYPE_FILE;
}

int os_file_mode(const char *file, struct openflags *mode_out)
{
	int err;

	*mode_out = OPENFLAGS();

	err = access(file, W_OK);
	if (err && (errno != EACCES))
		return -errno;
	else if (!err)
		*mode_out = of_write(*mode_out);

	err = access(file, R_OK);
	if (err && (errno != EACCES))
		return -errno;
	else if (!err)
		*mode_out = of_read(*mode_out);

	return err;
}

int os_open_file(const char *file, struct openflags flags, int mode)
{
	int fd, err, f = 0;

	if (flags.r && flags.w)
		f = O_RDWR;
	else if (flags.r)
		f = O_RDONLY;
	else if (flags.w)
		f = O_WRONLY;
	else f = 0;

	if (flags.s)
		f |= O_SYNC;
	if (flags.c)
		f |= O_CREAT;
	if (flags.t)
		f |= O_TRUNC;
	if (flags.e)
		f |= O_EXCL;
	if (flags.a)
		f |= O_APPEND;

	fd = open64(file, f, mode);
	if (fd < 0)
		return -errno;

	if (flags.cl && fcntl(fd, F_SETFD, 1)) {
		err = -errno;
		close(fd);
		return err;
	}

	return fd;
}

int os_connect_socket(const char *name)
{
	struct sockaddr_un sock;
	int fd, err;

	sock.sun_family = AF_UNIX;
	snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);

	fd = socket(AF_UNIX, SOCK_STREAM, 0);
	if (fd < 0) {
		err = -errno;
		goto out;
	}

	err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
	if (err) {
		err = -errno;
		goto out_close;
	}

	return fd;

out_close:
	close(fd);
out:
	return err;
}

void os_close_file(int fd)
{
	close(fd);
}

int os_seek_file(int fd, unsigned long long offset)
{
	unsigned long long actual;

	actual = lseek64(fd, offset, SEEK_SET);
	if (actual != offset)
		return -errno;
	return 0;
}

int os_read_file(int fd, void *buf, int len)
{
	int n = read(fd, buf, len);

	if (n < 0)
		return -errno;
	return n;
}

int os_write_file(int fd, const void *buf, int len)
{
	int n = write(fd, (void *) buf, len);

	if (n < 0)
		return -errno;
	return n;
}

int os_file_size(const char *file, unsigned long long *size_out)
{
	struct uml_stat buf;
	int err;

	err = os_stat_file(file, &buf);
	if (err < 0) {
		printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
		       -err);
		return err;
	}

	if (S_ISBLK(buf.ust_mode)) {
		int fd;
		long blocks;

		fd = open(file, O_RDONLY, 0);
		if (fd < 0) {
			err = -errno;
			printk(UM_KERN_ERR "Couldn't open \"%s\", "
			       "errno = %d\n", file, errno);
			return err;
		}
		if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
			err = -errno;
			printk(UM_KERN_ERR "Couldn't get the block size of "
			       "\"%s\", errno = %d\n", file, errno);
			close(fd);
			return err;
		}
		*size_out = ((long long) blocks) * 512;
		close(fd);
	}
	else *size_out = buf.ust_size;

	return 0;
}

int os_file_modtime(const char *file, unsigned long *modtime)
{
	struct uml_stat buf;
	int err;

	err = os_stat_file(file, &buf);
	if (err < 0) {
		printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
		       -err);
		return err;
	}

	*modtime = buf.ust_mtime;
	return 0;
}

int os_set_exec_close(int fd)
{
	int err;

	CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));

	if (err < 0)
		return -errno;
	return err;
}

int os_pipe(int *fds, int stream, int close_on_exec)
{
	int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;

	err = socketpair(AF_UNIX, type, 0, fds);
	if (err < 0)
		return -errno;

	if (!close_on_exec)
		return 0;

	err = os_set_exec_close(fds[0]);
	if (err < 0)
		goto error;

	err = os_set_exec_close(fds[1]);
	if (err < 0)
		goto error;

	return 0;

 error:
	printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
	       -err);
	close(fds[1]);
	close(fds[0]);
	return err;
}

int os_set_fd_async(int fd)
{
	int err, flags;

	flags = fcntl(fd, F_GETFL);
	if (flags < 0)
		return -errno;

	flags |= O_ASYNC | O_NONBLOCK;
	if (fcntl(fd, F_SETFL, flags) < 0) {
		err = -errno;
		printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
		       "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
		return err;
	}

	if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
	    (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
		err = -errno;
		printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
		       "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
		return err;
	}

	return 0;
}

int os_clear_fd_async(int fd)
{
	int flags;

	flags = fcntl(fd, F_GETFL);
	if (flags < 0)
		return -errno;

	flags &= ~(O_ASYNC | O_NONBLOCK);
	if (fcntl(fd, F_SETFL, flags) < 0)
		return -errno;
	return 0;
}

int os_set_fd_block(int fd, int blocking)
{
	int flags;

	flags = fcntl(fd, F_GETFL);
	if (flags < 0)
		return -errno;

	if (blocking)
		flags &= ~O_NONBLOCK;
	else
		flags |= O_NONBLOCK;

	if (fcntl(fd, F_SETFL, flags) < 0)
		return -errno;

	return 0;
}

int os_accept_connection(int fd)
{
	int new;

	new = accept(fd, NULL, 0);
	if (new < 0)
		return -errno;
	return new;
}

#ifndef SHUT_RD
#define SHUT_RD 0
#endif

#ifndef SHUT_WR
#define SHUT_WR 1
#endif

#ifndef SHUT_RDWR
#define SHUT_RDWR 2
#endif

int os_shutdown_socket(int fd, int r, int w)
{
	int what, err;

	if (r && w)
		what = SHUT_RDWR;
	else if (r)
		what = SHUT_RD;
	else if (w)
		what = SHUT_WR;
	else
		return -EINVAL;

	err = shutdown(fd, what);
	if (err < 0)
		return -errno;
	return 0;
}

int os_rcv_fd(int fd, int *helper_pid_out)
{
	int new, n;
	char buf[CMSG_SPACE(sizeof(new))];
	struct msghdr msg;
	struct cmsghdr *cmsg;
	struct iovec iov;

	msg.msg_name = NULL;
	msg.msg_namelen = 0;
	iov = ((struct iovec) { .iov_base  = helper_pid_out,
				.iov_len   = sizeof(*helper_pid_out) });
	msg.msg_iov = &iov;
	msg.msg_iovlen = 1;
	msg.msg_control = buf;
	msg.msg_controllen = sizeof(buf);
	msg.msg_flags = 0;

	n = recvmsg(fd, &msg, 0);
	if (n < 0)
		return -errno;
	else if (n != iov.iov_len)
		*helper_pid_out = -1;

	cmsg = CMSG_FIRSTHDR(&msg);
	if (cmsg == NULL) {
		printk(UM_KERN_ERR "rcv_fd didn't receive anything, "
		       "error = %d\n", errno);
		return -1;
	}
	if ((cmsg->cmsg_level != SOL_SOCKET) ||
	    (cmsg->cmsg_type != SCM_RIGHTS)) {
		printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n");
		return -1;
	}

	new = ((int *) CMSG_DATA(cmsg))[0];
	return new;
}

int os_create_unix_socket(const char *file, int len, int close_on_exec)
{
	struct sockaddr_un addr;
	int sock, err;

	sock = socket(PF_UNIX, SOCK_DGRAM, 0);
	if (sock < 0)
		return -errno;

	if (close_on_exec) {
		err = os_set_exec_close(sock);
		if (err < 0)
			printk(UM_KERN_ERR "create_unix_socket : "
			       "close_on_exec failed, err = %d", -err);
	}

	addr.sun_family = AF_UNIX;

	snprintf(addr.sun_path, len, "%s", file);

	err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
	if (err < 0)
		return -errno;

	return sock;
}

void os_flush_stdout(void)
{
	fflush(stdout);
}

int os_lock_file(int fd, int excl)
{
	int type = excl ? F_WRLCK : F_RDLCK;
	struct flock lock = ((struct flock) { .l_type	= type,
					      .l_whence	= SEEK_SET,
					      .l_start	= 0,
					      .l_len	= 0 } );
	int err, save;

	err = fcntl(fd, F_SETLK, &lock);
	if (!err)
		goto out;

	save = -errno;
	err = fcntl(fd, F_GETLK, &lock);
	if (err) {
		err = -errno;
		goto out;
	}

	printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
	       lock.l_pid);
	err = save;
 out:
	return err;
}
Commit	Line	Data
108ffa8c	1	/*
1adfd609	2	* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
1da177e4 LT	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>
1da177e4 LT	11	#include <sys/ioctl.h>
1da177e4 LT	12	#include <sys/mount.h>
1adfd609 JD	13	#include <sys/socket.h>
	14	#include <sys/stat.h>
	15	#include <sys/un.h>
	16	#include "kern_constants.h"
1da177e4 LT	17	#include "os.h"
1da177e4 LT	18	#include "user.h"
1da177e4	19
c9a3072d	20	static void copy_stat(struct uml_stat dst, const struct stat64 src)
1da177e4 LT	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
	38	int os_stat_fd(const int fd, struct uml_stat *ubuf)
	39	{
	40	struct stat64 sbuf;
	41	int err;
	42
9ead6fee	43	CATCH_EINTR(err = fstat64(fd, &sbuf));
1adfd609	44	if (err < 0)
108ffa8c	45	return -errno;
1da177e4	46
1adfd609	47	if (ubuf != NULL)
1da177e4	48	copy_stat(ubuf, &sbuf);
108ffa8c	49	return err;
1da177e4 LT	50	}
	51
	52	int os_stat_file(const char file_name, struct uml_stat ubuf)
	53	{
	54	struct stat64 sbuf;
	55	int err;
	56
1adfd609 JD	57	CATCH_EINTR(err = stat64(file_name, &sbuf));
1adfd609 JD	58	if (err < 0)
108ffa8c	59	return -errno;
1da177e4	60
1adfd609	61	if (ubuf != NULL)
1da177e4	62	copy_stat(ubuf, &sbuf);
108ffa8c	63	return err;
1da177e4 LT	64	}
1da177e4 LT	65
1adfd609	66	int os_access(const char *file, int mode)
1da177e4 LT	67	{
	68	int amode, err;
	69
1adfd609 JD	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);
1da177e4 LT	74
1da177e4 LT	75	err = access(file, amode);
1adfd609	76	if (err < 0)
108ffa8c	77	return -errno;
1da177e4	78
108ffa8c	79	return 0;
1da177e4 LT	80	}
1da177e4 LT	81
1da177e4 LT	82	/* FIXME? required only by hostaudio (because it passes ioctls verbatim) */
	83	int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
	84	{
	85	int err;
	86
	87	err = ioctl(fd, cmd, arg);
1adfd609	88	if (err < 0)
108ffa8c	89	return -errno;
1da177e4	90
108ffa8c	91	return err;
1da177e4 LT	92	}
1da177e4 LT	93
1da177e4 LT	94	/* FIXME: ensure namebuf in os_get_if_name is big enough */
	95	int os_get_ifname(int fd, char* namebuf)
	96	{
1adfd609	97	if (ioctl(fd, SIOCGIFNAME, namebuf) < 0)
108ffa8c	98	return -errno;
1da177e4	99
108ffa8c	100	return 0;
1da177e4 LT	101	}
	102
	103	int os_set_slip(int fd)
	104	{
	105	int disc, sencap;
	106
	107	disc = N_SLIP;
1adfd609	108	if (ioctl(fd, TIOCSETD, &disc) < 0)
b4fd310e	109	return -errno;
1da177e4 LT	110
1da177e4 LT	111	sencap = 0;
1adfd609	112	if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
b4fd310e	113	return -errno;
1da177e4	114
108ffa8c	115	return 0;
1da177e4 LT	116	}
1da177e4 LT	117
1da177e4 LT	118	int os_mode_fd(int fd, int mode)
	119	{
	120	int err;
	121
1adfd609 JD	122	CATCH_EINTR(err = fchmod(fd, mode));
1adfd609 JD	123	if (err < 0)
108ffa8c	124	return -errno;
1da177e4	125
108ffa8c	126	return 0;
1da177e4 LT	127	}
	128
	129	int os_file_type(char *file)
	130	{
	131	struct uml_stat buf;
	132	int err;
	133
	134	err = os_stat_file(file, &buf);
1adfd609	135	if (err < 0)
108ffa8c	136	return err;
1da177e4	137
1adfd609	138	if (S_ISDIR(buf.ust_mode))
108ffa8c	139	return OS_TYPE_DIR;
1adfd609	140	else if (S_ISLNK(buf.ust_mode))
108ffa8c	141	return OS_TYPE_SYMLINK;
1adfd609	142	else if (S_ISCHR(buf.ust_mode))
108ffa8c	143	return OS_TYPE_CHARDEV;
1adfd609	144	else if (S_ISBLK(buf.ust_mode))
108ffa8c	145	return OS_TYPE_BLOCKDEV;
1adfd609	146	else if (S_ISFIFO(buf.ust_mode))
108ffa8c	147	return OS_TYPE_FIFO;
1adfd609	148	else if (S_ISSOCK(buf.ust_mode))
108ffa8c JD	149	return OS_TYPE_SOCK;
108ffa8c JD	150	else return OS_TYPE_FILE;
1da177e4 LT	151	}
1da177e4 LT	152
c9a3072d	153	int os_file_mode(const char file, struct openflags mode_out)
1da177e4 LT	154	{
	155	int err;
	156
	157	*mode_out = OPENFLAGS();
	158
512b6fb1	159	err = access(file, W_OK);
1adfd609	160	if (err && (errno != EACCES))
512b6fb1	161	return -errno;
1adfd609	162	else if (!err)
512b6fb1	163	mode_out = of_write(mode_out);
1da177e4	164
512b6fb1	165	err = access(file, R_OK);
1adfd609	166	if (err && (errno != EACCES))
512b6fb1	167	return -errno;
1adfd609	168	else if (!err)
512b6fb1	169	mode_out = of_read(mode_out);
1da177e4	170
512b6fb1	171	return err;
1da177e4 LT	172	}
1da177e4 LT	173
c9a3072d	174	int os_open_file(const char *file, struct openflags flags, int mode)
1da177e4	175	{
b4fd310e	176	int fd, err, f = 0;
1da177e4	177
1adfd609 JD	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;
1da177e4 LT	184	else f = 0;
1da177e4 LT	185
1adfd609 JD	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;
bf53d85e JD	194	if (flags.a)
bf53d85e JD	195	f \|= O_APPEND;
1da177e4 LT	196
1da177e4 LT	197	fd = open64(file, f, mode);
1adfd609	198	if (fd < 0)
512b6fb1	199	return -errno;
1da177e4	200
1adfd609	201	if (flags.cl && fcntl(fd, F_SETFD, 1)) {
b4fd310e	202	err = -errno;
512b6fb1	203	close(fd);
b4fd310e	204	return err;
1da177e4 LT	205	}
1da177e4 LT	206
512b6fb1	207	return fd;
1da177e4 LT	208	}
1da177e4 LT	209
c9a3072d	210	int os_connect_socket(const char *name)
1da177e4 LT	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);
1adfd609	219	if (fd < 0) {
dc1561ac PBG	220	err = -errno;
	221	goto out;
	222	}
1da177e4 LT	223
1da177e4 LT	224	err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
1adfd609	225	if (err) {
dc1561ac PBG	226	err = -errno;
	227	goto out_close;
	228	}
1da177e4	229
dc1561ac PBG	230	return fd;
	231
	232	out_close:
	233	close(fd);
	234	out:
	235	return err;
1da177e4 LT	236	}
	237
	238	void os_close_file(int fd)
	239	{
	240	close(fd);
	241	}
	242
ba180fd4	243	int os_seek_file(int fd, unsigned long long offset)
1da177e4	244	{
ba180fd4	245	unsigned long long actual;
1da177e4 LT	246
1da177e4 LT	247	actual = lseek64(fd, offset, SEEK_SET);
1adfd609	248	if (actual != offset)
108ffa8c JD	249	return -errno;
108ffa8c JD	250	return 0;
1da177e4 LT	251	}
1da177e4 LT	252
1da177e4	253	int os_read_file(int fd, void *buf, int len)
3d564047 JD	254	{
	255	int n = read(fd, buf, len);
	256
1adfd609	257	if (n < 0)
3d564047 JD	258	return -errno;
	259	return n;
	260	}
	261
1da177e4	262	int os_write_file(int fd, const void *buf, int len)
3d564047 JD	263	{
	264	int n = write(fd, (void *) buf, len);
	265
1adfd609	266	if (n < 0)
3d564047 JD	267	return -errno;
	268	return n;
	269	}
	270
c9a3072d	271	int os_file_size(const char file, unsigned long long size_out)
1da177e4 LT	272	{
	273	struct uml_stat buf;
	274	int err;
	275
	276	err = os_stat_file(file, &buf);
1adfd609 JD	277	if (err < 0) {
	278	printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
	279	-err);
512b6fb1	280	return err;
1da177e4 LT	281	}
1da177e4 LT	282
1adfd609	283	if (S_ISBLK(buf.ust_mode)) {
2c392a4f NG	284	int fd;
2c392a4f NG	285	long blocks;
1da177e4	286
512b6fb1	287	fd = open(file, O_RDONLY, 0);
1adfd609	288	if (fd < 0) {
512b6fb1	289	err = -errno;
1adfd609 JD	290	printk(UM_KERN_ERR "Couldn't open \"%s\", "
1adfd609 JD	291	"errno = %d\n", file, errno);
512b6fb1	292	return err;
1da177e4	293	}
1adfd609	294	if (ioctl(fd, BLKGETSIZE, &blocks) < 0) {
b4fd310e	295	err = -errno;
1adfd609 JD	296	printk(UM_KERN_ERR "Couldn't get the block size of "
1adfd609 JD	297	"\"%s\", errno = %d\n", file, errno);
512b6fb1 JD	298	close(fd);
512b6fb1 JD	299	return err;
1da177e4 LT	300	}
1da177e4 LT	301	size_out = ((long long) blocks) 512;
512b6fb1	302	close(fd);
1da177e4	303	}
512b6fb1 JD	304	else *size_out = buf.ust_size;
	305
	306	return 0;
1da177e4 LT	307	}
1da177e4 LT	308
c9a3072d	309	int os_file_modtime(const char file, unsigned long modtime)
1da177e4 LT	310	{
	311	struct uml_stat buf;
	312	int err;
	313
	314	err = os_stat_file(file, &buf);
1adfd609 JD	315	if (err < 0) {
	316	printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file,
	317	-err);
108ffa8c	318	return err;
1da177e4 LT	319	}
	320
	321	*modtime = buf.ust_mtime;
108ffa8c	322	return 0;
1da177e4 LT	323	}
1da177e4 LT	324
512b6fb1	325	int os_set_exec_close(int fd)
1da177e4	326	{
512b6fb1	327	int err;
1da177e4	328
512b6fb1	329	CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC));
1da177e4	330
1adfd609	331	if (err < 0)
512b6fb1 JD	332	return -errno;
512b6fb1 JD	333	return err;
1da177e4 LT	334	}
	335
	336	int 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);
1adfd609	341	if (err < 0)
512b6fb1	342	return -errno;
1da177e4	343
1adfd609	344	if (!close_on_exec)
512b6fb1	345	return 0;
1da177e4	346
512b6fb1	347	err = os_set_exec_close(fds[0]);
1adfd609	348	if (err < 0)
1da177e4 LT	349	goto error;
1da177e4 LT	350
512b6fb1	351	err = os_set_exec_close(fds[1]);
1adfd609	352	if (err < 0)
1da177e4 LT	353	goto error;
1da177e4 LT	354
108ffa8c	355	return 0;
1da177e4 LT	356
1da177e4 LT	357	error:
1adfd609 JD	358	printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n",
1adfd609 JD	359	-err);
512b6fb1 JD	360	close(fds[1]);
	361	close(fds[0]);
	362	return err;
1da177e4 LT	363	}
1da177e4 LT	364
bf8fde78	365	int os_set_fd_async(int fd)
1da177e4	366	{
bf8fde78 JD	367	int err, flags;
	368
	369	flags = fcntl(fd, F_GETFL);
	370	if (flags < 0)
	371	return -errno;
b4fd310e	372
bf8fde78 JD	373	flags \|= O_ASYNC \| O_NONBLOCK;
bf8fde78 JD	374	if (fcntl(fd, F_SETFL, flags) < 0) {
b4fd310e	375	err = -errno;
1adfd609 JD	376	printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC "
1adfd609 JD	377	"and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
b4fd310e	378	return err;
1da177e4	379	}
1da177e4	380
bf8fde78 JD	381	if ((fcntl(fd, F_SETSIG, SIGIO) < 0) \|\|
bf8fde78 JD	382	(fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
b4fd310e	383	err = -errno;
1adfd609	384	printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN "
bf8fde78	385	"(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
b4fd310e	386	return err;
1da177e4 LT	387	}
1da177e4 LT	388
108ffa8c	389	return 0;
1da177e4 LT	390	}
	391
	392	int os_clear_fd_async(int fd)
	393	{
1adfd609 JD	394	int flags;
	395
	396	flags = fcntl(fd, F_GETFL);
	397	if (flags < 0)
	398	return -errno;
1da177e4 LT	399
1da177e4 LT	400	flags &= ~(O_ASYNC \| O_NONBLOCK);
1adfd609	401	if (fcntl(fd, F_SETFL, flags) < 0)
108ffa8c JD	402	return -errno;
108ffa8c JD	403	return 0;
1da177e4 LT	404	}
	405
	406	int os_set_fd_block(int fd, int blocking)
	407	{
	408	int flags;
	409
	410	flags = fcntl(fd, F_GETFL);
1adfd609 JD	411	if (flags < 0)
1adfd609 JD	412	return -errno;
1da177e4	413
1adfd609 JD	414	if (blocking)
	415	flags &= ~O_NONBLOCK;
	416	else
	417	flags \|= O_NONBLOCK;
1da177e4	418
1adfd609	419	if (fcntl(fd, F_SETFL, flags) < 0)
b4fd310e JD	420	return -errno;
b4fd310e JD	421
108ffa8c	422	return 0;
1da177e4 LT	423	}
	424
	425	int os_accept_connection(int fd)
	426	{
	427	int new;
	428
	429	new = accept(fd, NULL, 0);
1adfd609	430	if (new < 0)
108ffa8c JD	431	return -errno;
108ffa8c JD	432	return new;
1da177e4 LT	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
	447	int os_shutdown_socket(int fd, int r, int w)
	448	{
	449	int what, err;
	450
1adfd609 JD	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
108ffa8c	458	return -EINVAL;
1adfd609	459
1da177e4	460	err = shutdown(fd, what);
1adfd609	461	if (err < 0)
108ffa8c JD	462	return -errno;
108ffa8c JD	463	return 0;
1da177e4 LT	464	}
	465
	466	int 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);
1adfd609	485	if (n < 0)
108ffa8c	486	return -errno;
1adfd609	487	else if (n != iov.iov_len)
1da177e4 LT	488	*helper_pid_out = -1;
	489
	490	cmsg = CMSG_FIRSTHDR(&msg);
1adfd609 JD	491	if (cmsg == NULL) {
	492	printk(UM_KERN_ERR "rcv_fd didn't receive anything, "
	493	"error = %d\n", errno);
108ffa8c	494	return -1;
1da177e4	495	}
1adfd609 JD	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");
108ffa8c	499	return -1;
1da177e4 LT	500	}
	501
	502	new = ((int *) CMSG_DATA(cmsg))[0];
108ffa8c	503	return new;
1da177e4 LT	504	}
1da177e4 LT	505
c9a3072d	506	int os_create_unix_socket(const char *file, int len, int close_on_exec)
1da177e4 LT	507	{
	508	struct sockaddr_un addr;
	509	int sock, err;
	510
	511	sock = socket(PF_UNIX, SOCK_DGRAM, 0);
1adfd609	512	if (sock < 0)
b4fd310e	513	return -errno;
1da177e4	514
1adfd609	515	if (close_on_exec) {
512b6fb1	516	err = os_set_exec_close(sock);
1adfd609 JD	517	if (err < 0)
	518	printk(UM_KERN_ERR "create_unix_socket : "
	519	"close_on_exec failed, err = %d", -err);
1da177e4 LT	520	}
	521
	522	addr.sun_family = AF_UNIX;
	523
1da177e4 LT	524	snprintf(addr.sun_path, len, "%s", file);
	525
	526	err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
1adfd609	527	if (err < 0)
b4fd310e	528	return -errno;
1da177e4	529
108ffa8c	530	return sock;
1da177e4 LT	531	}
	532
	533	void os_flush_stdout(void)
	534	{
	535	fflush(stdout);
	536	}
	537
	538	int 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);
1adfd609	548	if (!err)
1da177e4 LT	549	goto out;
	550
	551	save = -errno;
	552	err = fcntl(fd, F_GETLK, &lock);
1adfd609	553	if (err) {
1da177e4 LT	554	err = -errno;
	555	goto out;
	556	}
	557
1adfd609 JD	558	printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n",
1adfd609 JD	559	lock.l_pid);
1da177e4 LT	560	err = save;
1da177e4 LT	561	out:
108ffa8c	562	return err;
1da177e4	563	}