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

/*
 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 */

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

static void copy_stat(struct uml_stat *dst, 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;

	do {
		err = fstat64(fd, &sbuf);
	} while((err < 0) && (errno == EINTR)) ;

	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;

	do {
		err = stat64(file_name, &sbuf);
	} while((err < 0) && (errno == EINTR)) ;

	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;
}

void os_print_error(int error, const char* str)
{
	errno = error < 0 ? -error : error;

	perror(str);
}

/* 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;
}

int os_window_size(int fd, int *rows, int *cols)
{
	struct winsize size;

	if(ioctl(fd, TIOCGWINSZ, &size) < 0)
		return -errno;

	*rows = size.ws_row;
	*cols = size.ws_col;

	return 0;
}

int os_new_tty_pgrp(int fd, int pid)
{
	if(ioctl(fd, TIOCSCTTY, 0) < 0)
		return -errno;

	if(tcsetpgrp(fd, pid) < 0)
		return -errno;

	return 0;
}

/* 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_set_owner(int fd, int pid)
{
	if(fcntl(fd, F_SETOWN, pid) < 0){
		int save_errno = errno;

		if(fcntl(fd, F_GETOWN, 0) != pid)
			return -save_errno;
	}

	return 0;
}

/* FIXME? moved wholesale from sigio_user.c to get fcntls out of that file */
int os_sigio_async(int master, int slave)
{
	int flags;

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

	if((fcntl(master, F_SETFL, flags | O_NONBLOCK | O_ASYNC) < 0) ||
	   (fcntl(master, F_SETOWN, os_getpid()) < 0))
		return -errno;

	if((fcntl(slave, F_SETFL, flags | O_NONBLOCK) < 0))
		return -errno;

	return(0);
}

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

	do {
		err = fchmod(fd, mode);
	} while((err < 0) && (errno==EINTR)) ;

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

	*mode_out = OPENFLAGS();

	err = os_access(file, OS_ACC_W_OK);
	if((err < 0) && (err != -EACCES))
		return(err);

	*mode_out = of_write(*mode_out);

	err = os_access(file, OS_ACC_R_OK);
	if((err < 0) && (err != -EACCES))
		return(err);

	*mode_out = of_read(*mode_out);

	return(0);
}

int os_open_file(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;

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

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

	return(fd);
}

int os_connect_socket(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, __u64 offset)
{
	__u64 actual;

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

static int fault_buffer(void *start, int len,
			int (*copy_proc)(void *addr, void *buf, int len))
{
	int page = getpagesize(), i;
	char c;

	for(i = 0; i < len; i += page){
		if((*copy_proc)(start + i, &c, sizeof(c)))
			return -EFAULT;
	}
	if((len % page) != 0){
		if((*copy_proc)(start + len - 1, &c, sizeof(c)))
			return -EFAULT;
	}
	return 0;
}

static int file_io(int fd, void *buf, int len,
		   int (*io_proc)(int fd, void *buf, int len),
		   int (*copy_user_proc)(void *addr, void *buf, int len))
{
	int n, err;

	do {
		n = (*io_proc)(fd, buf, len);
		if((n < 0) && (errno == EFAULT)){
			err = fault_buffer(buf, len, copy_user_proc);
			if(err)
				return err;
			n = (*io_proc)(fd, buf, len);
		}
	} while((n < 0) && (errno == EINTR));

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

int os_read_file(int fd, void *buf, int len)
{
	return file_io(fd, buf, len, (int (*)(int, void *, int)) read,
		       copy_from_user_proc);
}

int os_write_file(int fd, const void *buf, int len)
{
	return file_io(fd, (void *) buf, len,
		       (int (*)(int, void *, int)) write, copy_to_user_proc);
}

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

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

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

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

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

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

	*modtime = buf.ust_mtime;
	return 0;
}

int os_get_exec_close(int fd, int* close_on_exec)
{
	int ret;

	do {
		ret = fcntl(fd, F_GETFD);
	} while((ret < 0) && (errno == EINTR)) ;

	if(ret < 0)
		return(-errno);

	*close_on_exec = (ret&FD_CLOEXEC) ? 1 : 0;
	return(ret);
}

int os_set_exec_close(int fd, int close_on_exec)
{
	int flag, err;

	if(close_on_exec) flag = FD_CLOEXEC;
	else flag = 0;

	do {
		err = fcntl(fd, F_SETFD, flag);
	} while((err < 0) && (errno == EINTR)) ;

	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], 1);
	if(err < 0)
		goto error;

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

	return 0;

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

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

	/* XXX This should do F_GETFL first */
	if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){
		err = -errno;
		printk("os_set_fd_async : failed to set O_ASYNC and "
		       "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
		return err;
	}
#ifdef notdef
	if(fcntl(fd, F_SETFD, 1) < 0){
		printk("os_set_fd_async : Setting FD_CLOEXEC failed, "
		       "errno = %d\n", errno);
	}
#endif

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

	return 0;
}

int os_clear_fd_async(int fd)
{
	int flags = fcntl(fd, F_GETFL);

	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(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 {
		printk("os_shutdown_socket : neither r or w was set\n");
		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 != sizeof(iov.iov_len))
		*helper_pid_out = -1;

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

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

int os_create_unix_socket(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, 1);
		if(err < 0)
			printk("create_unix_socket : close_on_exec failed, "
		       "err = %d", -err);
	}

	addr.sun_family = AF_UNIX;

	/* XXX Be more careful about overflow */
	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("F_SETLK failed, file already locked by pid %d\n", lock.l_pid);
	err = save;
 out:
	return err;
}
Commit	Line	Data
108ffa8c	1	/*
1da177e4 LT	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
	22	static 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
	40	int 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)
108ffa8c	50	return -errno;
1da177e4 LT	51
	52	if(ubuf != NULL)
	53	copy_stat(ubuf, &sbuf);
108ffa8c	54	return err;
1da177e4 LT	55	}
	56
	57	int 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)
108ffa8c	67	return -errno;
1da177e4 LT	68
	69	if(ubuf != NULL)
	70	copy_stat(ubuf, &sbuf);
108ffa8c	71	return err;
1da177e4 LT	72	}
	73
	74	int 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)
108ffa8c	83	return -errno;
1da177e4	84
108ffa8c	85	return 0;
1da177e4 LT	86	}
	87
	88	void 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) */
	96	int 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)
108ffa8c	102	return -errno;
1da177e4	103
108ffa8c	104	return err;
1da177e4 LT	105	}
	106
	107	int os_window_size(int fd, int rows, int cols)
	108	{
	109	struct winsize size;
	110
	111	if(ioctl(fd, TIOCGWINSZ, &size) < 0)
108ffa8c	112	return -errno;
1da177e4 LT	113
	114	*rows = size.ws_row;
	115	*cols = size.ws_col;
	116
108ffa8c	117	return 0;
1da177e4 LT	118	}
	119
	120	int os_new_tty_pgrp(int fd, int pid)
	121	{
b4fd310e JD	122	if(ioctl(fd, TIOCSCTTY, 0) < 0)
b4fd310e JD	123	return -errno;
1da177e4	124
b4fd310e JD	125	if(tcsetpgrp(fd, pid) < 0)
b4fd310e JD	126	return -errno;
1da177e4	127
108ffa8c	128	return 0;
1da177e4 LT	129	}
	130
	131	/* FIXME: ensure namebuf in os_get_if_name is big enough */
	132	int os_get_ifname(int fd, char* namebuf)
	133	{
	134	if(ioctl(fd, SIOCGIFNAME, namebuf) < 0)
108ffa8c	135	return -errno;
1da177e4	136
108ffa8c	137	return 0;
1da177e4 LT	138	}
	139
	140	int os_set_slip(int fd)
	141	{
	142	int disc, sencap;
	143
	144	disc = N_SLIP;
b4fd310e JD	145	if(ioctl(fd, TIOCSETD, &disc) < 0)
b4fd310e JD	146	return -errno;
1da177e4 LT	147
1da177e4 LT	148	sencap = 0;
b4fd310e JD	149	if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0)
b4fd310e JD	150	return -errno;
1da177e4	151
108ffa8c	152	return 0;
1da177e4 LT	153	}
	154
	155	int os_set_owner(int fd, int pid)
	156	{
	157	if(fcntl(fd, F_SETOWN, pid) < 0){
	158	int save_errno = errno;
	159
	160	if(fcntl(fd, F_GETOWN, 0) != pid)
108ffa8c	161	return -save_errno;
1da177e4 LT	162	}
1da177e4 LT	163
108ffa8c	164	return 0;
1da177e4 LT	165	}
	166
	167	/* FIXME? moved wholesale from sigio_user.c to get fcntls out of that file */
	168	int os_sigio_async(int master, int slave)
	169	{
	170	int flags;
	171
	172	flags = fcntl(master, F_GETFL);
b4fd310e	173	if(flags < 0)
2ace87b9	174	return -errno;
1da177e4 LT	175
1da177e4 LT	176	if((fcntl(master, F_SETFL, flags \| O_NONBLOCK \| O_ASYNC) < 0) \|\|
b4fd310e JD	177	(fcntl(master, F_SETOWN, os_getpid()) < 0))
b4fd310e JD	178	return -errno;
1da177e4	179
b4fd310e JD	180	if((fcntl(slave, F_SETFL, flags \| O_NONBLOCK) < 0))
b4fd310e JD	181	return -errno;
1da177e4 LT	182
	183	return(0);
	184	}
	185
	186	int os_mode_fd(int fd, int mode)
	187	{
	188	int err;
	189
	190	do {
	191	err = fchmod(fd, mode);
	192	} while((err < 0) && (errno==EINTR)) ;
	193
	194	if(err < 0)
108ffa8c	195	return -errno;
1da177e4	196
108ffa8c	197	return 0;
1da177e4 LT	198	}
	199
	200	int os_file_type(char *file)
	201	{
	202	struct uml_stat buf;
	203	int err;
	204
	205	err = os_stat_file(file, &buf);
	206	if(err < 0)
108ffa8c	207	return err;
1da177e4	208
108ffa8c JD	209	if(S_ISDIR(buf.ust_mode))
	210	return OS_TYPE_DIR;
	211	else if(S_ISLNK(buf.ust_mode))
	212	return OS_TYPE_SYMLINK;
	213	else if(S_ISCHR(buf.ust_mode))
	214	return OS_TYPE_CHARDEV;
	215	else if(S_ISBLK(buf.ust_mode))
	216	return OS_TYPE_BLOCKDEV;
	217	else if(S_ISFIFO(buf.ust_mode))
	218	return OS_TYPE_FIFO;
	219	else if(S_ISSOCK(buf.ust_mode))
	220	return OS_TYPE_SOCK;
	221	else return OS_TYPE_FILE;
1da177e4 LT	222	}
	223
	224	int os_file_mode(char file, struct openflags mode_out)
	225	{
	226	int err;
	227
	228	*mode_out = OPENFLAGS();
	229
	230	err = os_access(file, OS_ACC_W_OK);
	231	if((err < 0) && (err != -EACCES))
	232	return(err);
	233
	234	mode_out = of_write(mode_out);
	235
	236	err = os_access(file, OS_ACC_R_OK);
	237	if((err < 0) && (err != -EACCES))
	238	return(err);
	239
	240	mode_out = of_read(mode_out);
	241
	242	return(0);
	243	}
	244
	245	int os_open_file(char *file, struct openflags flags, int mode)
	246	{
b4fd310e	247	int fd, err, f = 0;
1da177e4 LT	248
	249	if(flags.r && flags.w) f = O_RDWR;
	250	else if(flags.r) f = O_RDONLY;
	251	else if(flags.w) f = O_WRONLY;
	252	else f = 0;
	253
	254	if(flags.s) f \|= O_SYNC;
	255	if(flags.c) f \|= O_CREAT;
	256	if(flags.t) f \|= O_TRUNC;
	257	if(flags.e) f \|= O_EXCL;
	258
	259	fd = open64(file, f, mode);
	260	if(fd < 0)
	261	return(-errno);
	262
	263	if(flags.cl && fcntl(fd, F_SETFD, 1)){
b4fd310e	264	err = -errno;
1da177e4	265	os_close_file(fd);
b4fd310e	266	return err;
1da177e4 LT	267	}
	268
	269	return(fd);
	270	}
	271
	272	int os_connect_socket(char *name)
	273	{
	274	struct sockaddr_un sock;
	275	int fd, err;
	276
	277	sock.sun_family = AF_UNIX;
	278	snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name);
	279
	280	fd = socket(AF_UNIX, SOCK_STREAM, 0);
dc1561ac PBG	281	if(fd < 0) {
	282	err = -errno;
	283	goto out;
	284	}
1da177e4 LT	285
1da177e4 LT	286	err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
dc1561ac PBG	287	if(err) {
	288	err = -errno;
	289	goto out_close;
	290	}
1da177e4	291
dc1561ac PBG	292	return fd;
	293
	294	out_close:
	295	close(fd);
	296	out:
	297	return err;
1da177e4 LT	298	}
	299
	300	void os_close_file(int fd)
	301	{
	302	close(fd);
	303	}
	304
	305	int os_seek_file(int fd, __u64 offset)
	306	{
	307	__u64 actual;
	308
	309	actual = lseek64(fd, offset, SEEK_SET);
	310	if(actual != offset)
108ffa8c JD	311	return -errno;
108ffa8c JD	312	return 0;
1da177e4 LT	313	}
	314
	315	static int fault_buffer(void *start, int len,
	316	int (copy_proc)(void addr, void *buf, int len))
	317	{
	318	int page = getpagesize(), i;
	319	char c;
	320
	321	for(i = 0; i < len; i += page){
	322	if((*copy_proc)(start + i, &c, sizeof(c)))
108ffa8c	323	return -EFAULT;
1da177e4 LT	324	}
	325	if((len % page) != 0){
	326	if((*copy_proc)(start + len - 1, &c, sizeof(c)))
108ffa8c	327	return -EFAULT;
1da177e4	328	}
108ffa8c	329	return 0;
1da177e4 LT	330	}
	331
	332	static int file_io(int fd, void *buf, int len,
	333	int (io_proc)(int fd, void buf, int len),
	334	int (copy_user_proc)(void addr, void *buf, int len))
	335	{
	336	int n, err;
	337
	338	do {
	339	n = (*io_proc)(fd, buf, len);
	340	if((n < 0) && (errno == EFAULT)){
	341	err = fault_buffer(buf, len, copy_user_proc);
	342	if(err)
108ffa8c	343	return err;
1da177e4 LT	344	n = (*io_proc)(fd, buf, len);
	345	}
	346	} while((n < 0) && (errno == EINTR));
	347
	348	if(n < 0)
108ffa8c JD	349	return -errno;
108ffa8c JD	350	return n;
1da177e4 LT	351	}
	352
	353	int os_read_file(int fd, void *buf, int len)
	354	{
108ffa8c JD	355	return file_io(fd, buf, len, (int ()(int, void , int)) read,
108ffa8c JD	356	copy_from_user_proc);
1da177e4 LT	357	}
	358
	359	int os_write_file(int fd, const void *buf, int len)
	360	{
108ffa8c JD	361	return file_io(fd, (void *) buf, len,
108ffa8c JD	362	(int ()(int, void , int)) write, copy_to_user_proc);
1da177e4 LT	363	}
1da177e4 LT	364
da00d9a5	365	int os_file_size(char file, unsigned long long size_out)
1da177e4 LT	366	{
	367	struct uml_stat buf;
	368	int err;
	369
	370	err = os_stat_file(file, &buf);
	371	if(err < 0){
	372	printk("Couldn't stat \"%s\" : err = %d\n", file, -err);
	373	return(err);
	374	}
	375
	376	if(S_ISBLK(buf.ust_mode)){
	377	int fd, blocks;
	378
	379	fd = os_open_file(file, of_read(OPENFLAGS()), 0);
	380	if(fd < 0){
	381	printk("Couldn't open \"%s\", errno = %d\n", file, -fd);
	382	return(fd);
	383	}
	384	if(ioctl(fd, BLKGETSIZE, &blocks) < 0){
b4fd310e	385	err = -errno;
1da177e4 LT	386	printk("Couldn't get the block size of \"%s\", "
1da177e4 LT	387	"errno = %d\n", file, errno);
1da177e4 LT	388	os_close_file(fd);
	389	return(err);
	390	}
	391	size_out = ((long long) blocks) 512;
	392	os_close_file(fd);
	393	return(0);
	394	}
	395	*size_out = buf.ust_size;
	396	return(0);
	397	}
	398
	399	int os_file_modtime(char file, unsigned long modtime)
	400	{
	401	struct uml_stat buf;
	402	int err;
	403
	404	err = os_stat_file(file, &buf);
	405	if(err < 0){
	406	printk("Couldn't stat \"%s\" : err = %d\n", file, -err);
108ffa8c	407	return err;
1da177e4 LT	408	}
	409
	410	*modtime = buf.ust_mtime;
108ffa8c	411	return 0;
1da177e4 LT	412	}
	413
	414	int os_get_exec_close(int fd, int* close_on_exec)
	415	{
	416	int ret;
	417
	418	do {
	419	ret = fcntl(fd, F_GETFD);
	420	} while((ret < 0) && (errno == EINTR)) ;
	421
	422	if(ret < 0)
	423	return(-errno);
	424
	425	*close_on_exec = (ret&FD_CLOEXEC) ? 1 : 0;
	426	return(ret);
	427	}
	428
	429	int os_set_exec_close(int fd, int close_on_exec)
	430	{
	431	int flag, err;
	432
	433	if(close_on_exec) flag = FD_CLOEXEC;
	434	else flag = 0;
	435
	436	do {
	437	err = fcntl(fd, F_SETFD, flag);
	438	} while((err < 0) && (errno == EINTR)) ;
	439
	440	if(err < 0)
	441	return(-errno);
	442	return(err);
	443	}
	444
	445	int os_pipe(int *fds, int stream, int close_on_exec)
	446	{
	447	int err, type = stream ? SOCK_STREAM : SOCK_DGRAM;
	448
	449	err = socketpair(AF_UNIX, type, 0, fds);
	450	if(err < 0)
	451	return(-errno);
	452
	453	if(!close_on_exec)
	454	return(0);
	455
	456	err = os_set_exec_close(fds[0], 1);
	457	if(err < 0)
	458	goto error;
	459
	460	err = os_set_exec_close(fds[1], 1);
	461	if(err < 0)
	462	goto error;
	463
108ffa8c	464	return 0;
1da177e4 LT	465
	466	error:
	467	printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err);
	468	os_close_file(fds[1]);
	469	os_close_file(fds[0]);
	470	return(err);
	471	}
	472
	473	int os_set_fd_async(int fd, int owner)
	474	{
b4fd310e JD	475	int err;
b4fd310e JD	476
1da177e4 LT	477	/* XXX This should do F_GETFL first */
1da177e4 LT	478	if(fcntl(fd, F_SETFL, O_ASYNC \| O_NONBLOCK) < 0){
b4fd310e	479	err = -errno;
1da177e4 LT	480	printk("os_set_fd_async : failed to set O_ASYNC and "
1da177e4 LT	481	"O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
b4fd310e	482	return err;
1da177e4 LT	483	}
	484	#ifdef notdef
	485	if(fcntl(fd, F_SETFD, 1) < 0){
	486	printk("os_set_fd_async : Setting FD_CLOEXEC failed, "
	487	"errno = %d\n", errno);
	488	}
	489	#endif
	490
	491	if((fcntl(fd, F_SETSIG, SIGIO) < 0) \|\|
	492	(fcntl(fd, F_SETOWN, owner) < 0)){
b4fd310e	493	err = -errno;
1da177e4	494	printk("os_set_fd_async : Failed to fcntl F_SETOWN "
108ffa8c	495	"(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd,
1da177e4	496	owner, errno);
b4fd310e	497	return err;
1da177e4 LT	498	}
1da177e4 LT	499
108ffa8c	500	return 0;
1da177e4 LT	501	}
	502
	503	int os_clear_fd_async(int fd)
	504	{
	505	int flags = fcntl(fd, F_GETFL);
	506
	507	flags &= ~(O_ASYNC \| O_NONBLOCK);
	508	if(fcntl(fd, F_SETFL, flags) < 0)
108ffa8c JD	509	return -errno;
108ffa8c JD	510	return 0;
1da177e4 LT	511	}
	512
	513	int os_set_fd_block(int fd, int blocking)
	514	{
	515	int flags;
	516
	517	flags = fcntl(fd, F_GETFL);
	518
	519	if(blocking) flags &= ~O_NONBLOCK;
	520	else flags \|= O_NONBLOCK;
	521
b4fd310e JD	522	if(fcntl(fd, F_SETFL, flags) < 0)
	523	return -errno;
	524
108ffa8c	525	return 0;
1da177e4 LT	526	}
	527
	528	int os_accept_connection(int fd)
	529	{
	530	int new;
	531
	532	new = accept(fd, NULL, 0);
108ffa8c JD	533	if(new < 0)
	534	return -errno;
	535	return new;
1da177e4 LT	536	}
	537
	538	#ifndef SHUT_RD
	539	#define SHUT_RD 0
	540	#endif
	541
	542	#ifndef SHUT_WR
	543	#define SHUT_WR 1
	544	#endif
	545
	546	#ifndef SHUT_RDWR
	547	#define SHUT_RDWR 2
	548	#endif
	549
	550	int os_shutdown_socket(int fd, int r, int w)
	551	{
	552	int what, err;
	553
	554	if(r && w) what = SHUT_RDWR;
	555	else if(r) what = SHUT_RD;
	556	else if(w) what = SHUT_WR;
	557	else {
	558	printk("os_shutdown_socket : neither r or w was set\n");
108ffa8c	559	return -EINVAL;
1da177e4 LT	560	}
	561	err = shutdown(fd, what);
	562	if(err < 0)
108ffa8c JD	563	return -errno;
108ffa8c JD	564	return 0;
1da177e4 LT	565	}
	566
	567	int os_rcv_fd(int fd, int *helper_pid_out)
	568	{
	569	int new, n;
	570	char buf[CMSG_SPACE(sizeof(new))];
	571	struct msghdr msg;
	572	struct cmsghdr *cmsg;
	573	struct iovec iov;
	574
	575	msg.msg_name = NULL;
	576	msg.msg_namelen = 0;
	577	iov = ((struct iovec) { .iov_base = helper_pid_out,
	578	.iov_len = sizeof(*helper_pid_out) });
	579	msg.msg_iov = &iov;
	580	msg.msg_iovlen = 1;
	581	msg.msg_control = buf;
	582	msg.msg_controllen = sizeof(buf);
	583	msg.msg_flags = 0;
	584
	585	n = recvmsg(fd, &msg, 0);
	586	if(n < 0)
108ffa8c	587	return -errno;
1da177e4 LT	588
	589	else if(n != sizeof(iov.iov_len))
	590	*helper_pid_out = -1;
	591
	592	cmsg = CMSG_FIRSTHDR(&msg);
	593	if(cmsg == NULL){
	594	printk("rcv_fd didn't receive anything, error = %d\n", errno);
108ffa8c	595	return -1;
1da177e4	596	}
108ffa8c	597	if((cmsg->cmsg_level != SOL_SOCKET) \|\|
1da177e4 LT	598	(cmsg->cmsg_type != SCM_RIGHTS)){
1da177e4 LT	599	printk("rcv_fd didn't receive a descriptor\n");
108ffa8c	600	return -1;
1da177e4 LT	601	}
	602
	603	new = ((int *) CMSG_DATA(cmsg))[0];
108ffa8c	604	return new;
1da177e4 LT	605	}
	606
	607	int os_create_unix_socket(char *file, int len, int close_on_exec)
	608	{
	609	struct sockaddr_un addr;
	610	int sock, err;
	611
	612	sock = socket(PF_UNIX, SOCK_DGRAM, 0);
b4fd310e JD	613	if(sock < 0)
b4fd310e JD	614	return -errno;
1da177e4 LT	615
	616	if(close_on_exec) {
	617	err = os_set_exec_close(sock, 1);
	618	if(err < 0)
	619	printk("create_unix_socket : close_on_exec failed, "
	620	"err = %d", -err);
	621	}
	622
	623	addr.sun_family = AF_UNIX;
	624
	625	/* XXX Be more careful about overflow */
	626	snprintf(addr.sun_path, len, "%s", file);
	627
	628	err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
b4fd310e JD	629	if(err < 0)
b4fd310e JD	630	return -errno;
1da177e4	631
108ffa8c	632	return sock;
1da177e4 LT	633	}
	634
	635	void os_flush_stdout(void)
	636	{
	637	fflush(stdout);
	638	}
	639
	640	int os_lock_file(int fd, int excl)
	641	{
	642	int type = excl ? F_WRLCK : F_RDLCK;
	643	struct flock lock = ((struct flock) { .l_type = type,
	644	.l_whence = SEEK_SET,
	645	.l_start = 0,
	646	.l_len = 0 } );
	647	int err, save;
	648
	649	err = fcntl(fd, F_SETLK, &lock);
	650	if(!err)
	651	goto out;
	652
	653	save = -errno;
	654	err = fcntl(fd, F_GETLK, &lock);
	655	if(err){
	656	err = -errno;
	657	goto out;
	658	}
	659
	660	printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid);
	661	err = save;
	662	out:
108ffa8c	663	return err;
1da177e4	664	}