1 files changed, 680 insertions, 0 deletions

diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
new file mode 100644
index 000000000000..77d4066d1af8
--- /dev/null
+++ b/arch/um/os-Linux/file.c
@@ -0,0 +1,680 @@
+/* 
+ * 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){
+                printk("TIOCSCTTY failed, errno = %d\n", errno);
+                return(-errno);
+        }
+
+        if(tcsetpgrp(fd, pid) < 0){
+                printk("tcsetpgrp failed, errno = %d\n", errno);
+                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){
+                printk("Failed to set slip line discipline - "
+                       "errno = %d\n", errno);
+                return(-errno);
+        }
+
+        sencap = 0;
+        if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0){
+                printk("Failed to set slip encapsulation - "
+                       "errno = %d\n", errno);
+                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) {
+                printk("fcntl F_GETFL failed, errno = %d\n", errno);
+                return(-errno);
+        }
+
+        if((fcntl(master, F_SETFL, flags | O_NONBLOCK | O_ASYNC) < 0) ||
+           (fcntl(master, F_SETOWN, os_getpid()) < 0)){
+                printk("fcntl F_SETFL or F_SETOWN failed, errno = %d\n",
+                       errno);
+                return(-errno);
+        }
+
+        if((fcntl(slave, F_SETFL, flags | O_NONBLOCK) < 0)){
+                printk("fcntl F_SETFL failed, errno = %d\n", errno);
+                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, 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)){
+                os_close_file(fd);
+                return(-errno);
+        }
+
+        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)
+                return(fd);
+
+        err = connect(fd, (struct sockaddr *) &sock, sizeof(sock));
+        if(err)
+                return(-errno);
+
+        return(fd);
+}
+
+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, 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){
+                        printk("Couldn't get the block size of \"%s\", "
+                               "errno = %d\n", file, errno);
+                        err = -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)
+{
+        /* XXX This should do F_GETFL first */
+        if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){
+                printk("os_set_fd_async : failed to set O_ASYNC and "
+                       "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
+                return(-errno);
+        }
+#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)){
+                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(-errno);
+        }
+
+        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){
+                printk("Failed to change blocking on fd # %d, errno = %d\n",
+                       fd, errno);
+                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){
+                printk("create_unix_socket - socket failed, errno = %d\n",
+                       errno);
+                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){
+                printk("create_listening_socket at '%s' - bind failed, "
+                       "errno = %d\n", file, errno);
+                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);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */