11da177e4SLinus Torvalds /* 21adfd609SJeff Dike * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 31da177e4SLinus Torvalds * Licensed under the GPL 41da177e4SLinus Torvalds */ 51da177e4SLinus Torvalds 61da177e4SLinus Torvalds #include <stdio.h> 71da177e4SLinus Torvalds #include <unistd.h> 81da177e4SLinus Torvalds #include <errno.h> 91da177e4SLinus Torvalds #include <fcntl.h> 101da177e4SLinus Torvalds #include <signal.h> 111da177e4SLinus Torvalds #include <sys/ioctl.h> 121da177e4SLinus Torvalds #include <sys/mount.h> 131adfd609SJeff Dike #include <sys/socket.h> 141adfd609SJeff Dike #include <sys/stat.h> 151adfd609SJeff Dike #include <sys/un.h> 161adfd609SJeff Dike #include "kern_constants.h" 171da177e4SLinus Torvalds #include "os.h" 181da177e4SLinus Torvalds #include "user.h" 191da177e4SLinus Torvalds 20c9a3072dSWANG Cong static void copy_stat(struct uml_stat *dst, const struct stat64 *src) 211da177e4SLinus Torvalds { 221da177e4SLinus Torvalds *dst = ((struct uml_stat) { 231da177e4SLinus Torvalds .ust_dev = src->st_dev, /* device */ 241da177e4SLinus Torvalds .ust_ino = src->st_ino, /* inode */ 251da177e4SLinus Torvalds .ust_mode = src->st_mode, /* protection */ 261da177e4SLinus Torvalds .ust_nlink = src->st_nlink, /* number of hard links */ 271da177e4SLinus Torvalds .ust_uid = src->st_uid, /* user ID of owner */ 281da177e4SLinus Torvalds .ust_gid = src->st_gid, /* group ID of owner */ 291da177e4SLinus Torvalds .ust_size = src->st_size, /* total size, in bytes */ 301da177e4SLinus Torvalds .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */ 311da177e4SLinus Torvalds .ust_blocks = src->st_blocks, /* number of blocks allocated */ 321da177e4SLinus Torvalds .ust_atime = src->st_atime, /* time of last access */ 331da177e4SLinus Torvalds .ust_mtime = src->st_mtime, /* time of last modification */ 341da177e4SLinus Torvalds .ust_ctime = src->st_ctime, /* time of last change */ 351da177e4SLinus Torvalds }); 361da177e4SLinus Torvalds } 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds int os_stat_fd(const int fd, struct uml_stat *ubuf) 391da177e4SLinus Torvalds { 401da177e4SLinus Torvalds struct stat64 sbuf; 411da177e4SLinus Torvalds int err; 421da177e4SLinus Torvalds 439ead6feeSJeff Dike CATCH_EINTR(err = fstat64(fd, &sbuf)); 441da177e4SLinus Torvalds if (err < 0) 45108ffa8cSJeff Dike return -errno; 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds if (ubuf != NULL) 481da177e4SLinus Torvalds copy_stat(ubuf, &sbuf); 49108ffa8cSJeff Dike return err; 501da177e4SLinus Torvalds } 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds int os_stat_file(const char *file_name, struct uml_stat *ubuf) 531da177e4SLinus Torvalds { 541da177e4SLinus Torvalds struct stat64 sbuf; 551da177e4SLinus Torvalds int err; 561da177e4SLinus Torvalds 571adfd609SJeff Dike CATCH_EINTR(err = stat64(file_name, &sbuf)); 581da177e4SLinus Torvalds if (err < 0) 59108ffa8cSJeff Dike return -errno; 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds if (ubuf != NULL) 621da177e4SLinus Torvalds copy_stat(ubuf, &sbuf); 63108ffa8cSJeff Dike return err; 641da177e4SLinus Torvalds } 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds int os_access(const char *file, int mode) 671da177e4SLinus Torvalds { 681da177e4SLinus Torvalds int amode, err; 691da177e4SLinus Torvalds 701adfd609SJeff Dike amode = (mode & OS_ACC_R_OK ? R_OK : 0) | 711adfd609SJeff Dike (mode & OS_ACC_W_OK ? W_OK : 0) | 721adfd609SJeff Dike (mode & OS_ACC_X_OK ? X_OK : 0) | 731adfd609SJeff Dike (mode & OS_ACC_F_OK ? F_OK : 0); 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds err = access(file, amode); 761da177e4SLinus Torvalds if (err < 0) 77108ffa8cSJeff Dike return -errno; 781da177e4SLinus Torvalds 79108ffa8cSJeff Dike return 0; 801da177e4SLinus Torvalds } 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */ 831da177e4SLinus Torvalds int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg) 841da177e4SLinus Torvalds { 851da177e4SLinus Torvalds int err; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds err = ioctl(fd, cmd, arg); 881da177e4SLinus Torvalds if (err < 0) 89108ffa8cSJeff Dike return -errno; 901da177e4SLinus Torvalds 91108ffa8cSJeff Dike return err; 921da177e4SLinus Torvalds } 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds /* FIXME: ensure namebuf in os_get_if_name is big enough */ 951da177e4SLinus Torvalds int os_get_ifname(int fd, char* namebuf) 961da177e4SLinus Torvalds { 971da177e4SLinus Torvalds if (ioctl(fd, SIOCGIFNAME, namebuf) < 0) 98108ffa8cSJeff Dike return -errno; 991da177e4SLinus Torvalds 100108ffa8cSJeff Dike return 0; 1011da177e4SLinus Torvalds } 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds int os_set_slip(int fd) 1041da177e4SLinus Torvalds { 1051da177e4SLinus Torvalds int disc, sencap; 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds disc = N_SLIP; 108b4fd310eSJeff Dike if (ioctl(fd, TIOCSETD, &disc) < 0) 109b4fd310eSJeff Dike return -errno; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds sencap = 0; 112b4fd310eSJeff Dike if (ioctl(fd, SIOCSIFENCAP, &sencap) < 0) 113b4fd310eSJeff Dike return -errno; 1141da177e4SLinus Torvalds 115108ffa8cSJeff Dike return 0; 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds int os_mode_fd(int fd, int mode) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds int err; 1211da177e4SLinus Torvalds 1221adfd609SJeff Dike CATCH_EINTR(err = fchmod(fd, mode)); 1231da177e4SLinus Torvalds if (err < 0) 124108ffa8cSJeff Dike return -errno; 1251da177e4SLinus Torvalds 126108ffa8cSJeff Dike return 0; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds int os_file_type(char *file) 1301da177e4SLinus Torvalds { 1311da177e4SLinus Torvalds struct uml_stat buf; 1321da177e4SLinus Torvalds int err; 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds err = os_stat_file(file, &buf); 1351da177e4SLinus Torvalds if (err < 0) 136108ffa8cSJeff Dike return err; 1371da177e4SLinus Torvalds 138108ffa8cSJeff Dike if (S_ISDIR(buf.ust_mode)) 139108ffa8cSJeff Dike return OS_TYPE_DIR; 140108ffa8cSJeff Dike else if (S_ISLNK(buf.ust_mode)) 141108ffa8cSJeff Dike return OS_TYPE_SYMLINK; 142108ffa8cSJeff Dike else if (S_ISCHR(buf.ust_mode)) 143108ffa8cSJeff Dike return OS_TYPE_CHARDEV; 144108ffa8cSJeff Dike else if (S_ISBLK(buf.ust_mode)) 145108ffa8cSJeff Dike return OS_TYPE_BLOCKDEV; 146108ffa8cSJeff Dike else if (S_ISFIFO(buf.ust_mode)) 147108ffa8cSJeff Dike return OS_TYPE_FIFO; 148108ffa8cSJeff Dike else if (S_ISSOCK(buf.ust_mode)) 149108ffa8cSJeff Dike return OS_TYPE_SOCK; 150108ffa8cSJeff Dike else return OS_TYPE_FILE; 1511da177e4SLinus Torvalds } 1521da177e4SLinus Torvalds 153c9a3072dSWANG Cong int os_file_mode(const char *file, struct openflags *mode_out) 1541da177e4SLinus Torvalds { 1551da177e4SLinus Torvalds int err; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds *mode_out = OPENFLAGS(); 1581da177e4SLinus Torvalds 159512b6fb1SJeff Dike err = access(file, W_OK); 160512b6fb1SJeff Dike if (err && (errno != EACCES)) 161512b6fb1SJeff Dike return -errno; 162512b6fb1SJeff Dike else if (!err) 1631da177e4SLinus Torvalds *mode_out = of_write(*mode_out); 1641da177e4SLinus Torvalds 165512b6fb1SJeff Dike err = access(file, R_OK); 166512b6fb1SJeff Dike if (err && (errno != EACCES)) 167512b6fb1SJeff Dike return -errno; 168512b6fb1SJeff Dike else if (!err) 1691da177e4SLinus Torvalds *mode_out = of_read(*mode_out); 1701da177e4SLinus Torvalds 171512b6fb1SJeff Dike return err; 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds 174c9a3072dSWANG Cong int os_open_file(const char *file, struct openflags flags, int mode) 1751da177e4SLinus Torvalds { 176b4fd310eSJeff Dike int fd, err, f = 0; 1771da177e4SLinus Torvalds 1781adfd609SJeff Dike if (flags.r && flags.w) 1791adfd609SJeff Dike f = O_RDWR; 1801adfd609SJeff Dike else if (flags.r) 1811adfd609SJeff Dike f = O_RDONLY; 1821adfd609SJeff Dike else if (flags.w) 1831adfd609SJeff Dike f = O_WRONLY; 1841da177e4SLinus Torvalds else f = 0; 1851da177e4SLinus Torvalds 1861adfd609SJeff Dike if (flags.s) 1871adfd609SJeff Dike f |= O_SYNC; 1881adfd609SJeff Dike if (flags.c) 1891adfd609SJeff Dike f |= O_CREAT; 1901adfd609SJeff Dike if (flags.t) 1911adfd609SJeff Dike f |= O_TRUNC; 1921adfd609SJeff Dike if (flags.e) 1931adfd609SJeff Dike f |= O_EXCL; 194bf53d85eSJeff Dike if (flags.a) 195bf53d85eSJeff Dike f |= O_APPEND; 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds fd = open64(file, f, mode); 1981da177e4SLinus Torvalds if (fd < 0) 199512b6fb1SJeff Dike return -errno; 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds if (flags.cl && fcntl(fd, F_SETFD, 1)) { 202b4fd310eSJeff Dike err = -errno; 203512b6fb1SJeff Dike close(fd); 204b4fd310eSJeff Dike return err; 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds 207512b6fb1SJeff Dike return fd; 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds 210c9a3072dSWANG Cong int os_connect_socket(const char *name) 2111da177e4SLinus Torvalds { 2121da177e4SLinus Torvalds struct sockaddr_un sock; 2131da177e4SLinus Torvalds int fd, err; 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds sock.sun_family = AF_UNIX; 2161da177e4SLinus Torvalds snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name); 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds fd = socket(AF_UNIX, SOCK_STREAM, 0); 219dc1561acSPaolo 'Blaisorblade' Giarrusso if (fd < 0) { 220dc1561acSPaolo 'Blaisorblade' Giarrusso err = -errno; 221dc1561acSPaolo 'Blaisorblade' Giarrusso goto out; 222dc1561acSPaolo 'Blaisorblade' Giarrusso } 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); 225dc1561acSPaolo 'Blaisorblade' Giarrusso if (err) { 226dc1561acSPaolo 'Blaisorblade' Giarrusso err = -errno; 227dc1561acSPaolo 'Blaisorblade' Giarrusso goto out_close; 228dc1561acSPaolo 'Blaisorblade' Giarrusso } 2291da177e4SLinus Torvalds 230dc1561acSPaolo 'Blaisorblade' Giarrusso return fd; 231dc1561acSPaolo 'Blaisorblade' Giarrusso 232dc1561acSPaolo 'Blaisorblade' Giarrusso out_close: 233dc1561acSPaolo 'Blaisorblade' Giarrusso close(fd); 234dc1561acSPaolo 'Blaisorblade' Giarrusso out: 235dc1561acSPaolo 'Blaisorblade' Giarrusso return err; 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds 2381da177e4SLinus Torvalds void os_close_file(int fd) 2391da177e4SLinus Torvalds { 2401da177e4SLinus Torvalds close(fd); 2411da177e4SLinus Torvalds } 2421da177e4SLinus Torvalds 243ba180fd4SJeff Dike int os_seek_file(int fd, unsigned long long offset) 2441da177e4SLinus Torvalds { 245ba180fd4SJeff Dike unsigned long long actual; 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds actual = lseek64(fd, offset, SEEK_SET); 2481da177e4SLinus Torvalds if (actual != offset) 249108ffa8cSJeff Dike return -errno; 250108ffa8cSJeff Dike return 0; 2511da177e4SLinus Torvalds } 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds int os_read_file(int fd, void *buf, int len) 2541da177e4SLinus Torvalds { 2553d564047SJeff Dike int n = read(fd, buf, len); 2563d564047SJeff Dike 2573d564047SJeff Dike if (n < 0) 2583d564047SJeff Dike return -errno; 2593d564047SJeff Dike return n; 2603d564047SJeff Dike } 2613d564047SJeff Dike 2621da177e4SLinus Torvalds int os_write_file(int fd, const void *buf, int len) 2631da177e4SLinus Torvalds { 2643d564047SJeff Dike int n = write(fd, (void *) buf, len); 2653d564047SJeff Dike 2663d564047SJeff Dike if (n < 0) 2673d564047SJeff Dike return -errno; 2683d564047SJeff Dike return n; 2693d564047SJeff Dike } 2703d564047SJeff Dike 271c9a3072dSWANG Cong int os_file_size(const char *file, unsigned long long *size_out) 2721da177e4SLinus Torvalds { 2731da177e4SLinus Torvalds struct uml_stat buf; 2741da177e4SLinus Torvalds int err; 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds err = os_stat_file(file, &buf); 2771da177e4SLinus Torvalds if (err < 0) { 2781adfd609SJeff Dike printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 2791adfd609SJeff Dike -err); 280512b6fb1SJeff Dike return err; 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds if (S_ISBLK(buf.ust_mode)) { 2842c392a4fSNicolas George int fd; 2852c392a4fSNicolas George long blocks; 2861da177e4SLinus Torvalds 287512b6fb1SJeff Dike fd = open(file, O_RDONLY, 0); 2881da177e4SLinus Torvalds if (fd < 0) { 289512b6fb1SJeff Dike err = -errno; 2901adfd609SJeff Dike printk(UM_KERN_ERR "Couldn't open \"%s\", " 2911adfd609SJeff Dike "errno = %d\n", file, errno); 292512b6fb1SJeff Dike return err; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds if (ioctl(fd, BLKGETSIZE, &blocks) < 0) { 295b4fd310eSJeff Dike err = -errno; 2961adfd609SJeff Dike printk(UM_KERN_ERR "Couldn't get the block size of " 2971adfd609SJeff Dike "\"%s\", errno = %d\n", file, errno); 298512b6fb1SJeff Dike close(fd); 299512b6fb1SJeff Dike return err; 3001da177e4SLinus Torvalds } 3011da177e4SLinus Torvalds *size_out = ((long long) blocks) * 512; 302512b6fb1SJeff Dike close(fd); 3031da177e4SLinus Torvalds } 304512b6fb1SJeff Dike else *size_out = buf.ust_size; 305512b6fb1SJeff Dike 306512b6fb1SJeff Dike return 0; 3071da177e4SLinus Torvalds } 3081da177e4SLinus Torvalds 309c9a3072dSWANG Cong int os_file_modtime(const char *file, unsigned long *modtime) 3101da177e4SLinus Torvalds { 3111da177e4SLinus Torvalds struct uml_stat buf; 3121da177e4SLinus Torvalds int err; 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds err = os_stat_file(file, &buf); 3151da177e4SLinus Torvalds if (err < 0) { 3161adfd609SJeff Dike printk(UM_KERN_ERR "Couldn't stat \"%s\" : err = %d\n", file, 3171adfd609SJeff Dike -err); 318108ffa8cSJeff Dike return err; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds *modtime = buf.ust_mtime; 322108ffa8cSJeff Dike return 0; 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds 325512b6fb1SJeff Dike int os_set_exec_close(int fd) 3261da177e4SLinus Torvalds { 327512b6fb1SJeff Dike int err; 3281da177e4SLinus Torvalds 329512b6fb1SJeff Dike CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC)); 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds if (err < 0) 332512b6fb1SJeff Dike return -errno; 333512b6fb1SJeff Dike return err; 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds int os_pipe(int *fds, int stream, int close_on_exec) 3371da177e4SLinus Torvalds { 3381da177e4SLinus Torvalds int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds err = socketpair(AF_UNIX, type, 0, fds); 3411da177e4SLinus Torvalds if (err < 0) 342512b6fb1SJeff Dike return -errno; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds if (!close_on_exec) 345512b6fb1SJeff Dike return 0; 3461da177e4SLinus Torvalds 347512b6fb1SJeff Dike err = os_set_exec_close(fds[0]); 3481da177e4SLinus Torvalds if (err < 0) 3491da177e4SLinus Torvalds goto error; 3501da177e4SLinus Torvalds 351512b6fb1SJeff Dike err = os_set_exec_close(fds[1]); 3521da177e4SLinus Torvalds if (err < 0) 3531da177e4SLinus Torvalds goto error; 3541da177e4SLinus Torvalds 355108ffa8cSJeff Dike return 0; 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds error: 3581adfd609SJeff Dike printk(UM_KERN_ERR "os_pipe : Setting FD_CLOEXEC failed, err = %d\n", 3591adfd609SJeff Dike -err); 360512b6fb1SJeff Dike close(fds[1]); 361512b6fb1SJeff Dike close(fds[0]); 362512b6fb1SJeff Dike return err; 3631da177e4SLinus Torvalds } 3641da177e4SLinus Torvalds 365bf8fde78SJeff Dike int os_set_fd_async(int fd) 3661da177e4SLinus Torvalds { 367bf8fde78SJeff Dike int err, flags; 368b4fd310eSJeff Dike 369bf8fde78SJeff Dike flags = fcntl(fd, F_GETFL); 370bf8fde78SJeff Dike if (flags < 0) 371bf8fde78SJeff Dike return -errno; 372bf8fde78SJeff Dike 373bf8fde78SJeff Dike flags |= O_ASYNC | O_NONBLOCK; 374bf8fde78SJeff Dike if (fcntl(fd, F_SETFL, flags) < 0) { 375b4fd310eSJeff Dike err = -errno; 3761adfd609SJeff Dike printk(UM_KERN_ERR "os_set_fd_async : failed to set O_ASYNC " 3771adfd609SJeff Dike "and O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 378b4fd310eSJeff Dike return err; 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds if ((fcntl(fd, F_SETSIG, SIGIO) < 0) || 382bf8fde78SJeff Dike (fcntl(fd, F_SETOWN, os_getpid()) < 0)) { 383b4fd310eSJeff Dike err = -errno; 3841adfd609SJeff Dike printk(UM_KERN_ERR "os_set_fd_async : Failed to fcntl F_SETOWN " 385bf8fde78SJeff Dike "(or F_SETSIG) fd %d, errno = %d\n", fd, errno); 386b4fd310eSJeff Dike return err; 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 389108ffa8cSJeff Dike return 0; 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds int os_clear_fd_async(int fd) 3931da177e4SLinus Torvalds { 3941adfd609SJeff Dike int flags; 3951adfd609SJeff Dike 3961adfd609SJeff Dike flags = fcntl(fd, F_GETFL); 3971adfd609SJeff Dike if (flags < 0) 3981adfd609SJeff Dike return -errno; 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds flags &= ~(O_ASYNC | O_NONBLOCK); 4011da177e4SLinus Torvalds if (fcntl(fd, F_SETFL, flags) < 0) 402108ffa8cSJeff Dike return -errno; 403108ffa8cSJeff Dike return 0; 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds int os_set_fd_block(int fd, int blocking) 4071da177e4SLinus Torvalds { 4081da177e4SLinus Torvalds int flags; 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds flags = fcntl(fd, F_GETFL); 4111adfd609SJeff Dike if (flags < 0) 4121adfd609SJeff Dike return -errno; 4131da177e4SLinus Torvalds 4141adfd609SJeff Dike if (blocking) 4151adfd609SJeff Dike flags &= ~O_NONBLOCK; 4161adfd609SJeff Dike else 4171adfd609SJeff Dike flags |= O_NONBLOCK; 4181da177e4SLinus Torvalds 419b4fd310eSJeff Dike if (fcntl(fd, F_SETFL, flags) < 0) 420b4fd310eSJeff Dike return -errno; 421b4fd310eSJeff Dike 422108ffa8cSJeff Dike return 0; 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds int os_accept_connection(int fd) 4261da177e4SLinus Torvalds { 4271da177e4SLinus Torvalds int new; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds new = accept(fd, NULL, 0); 4301da177e4SLinus Torvalds if (new < 0) 431108ffa8cSJeff Dike return -errno; 432108ffa8cSJeff Dike return new; 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds #ifndef SHUT_RD 4361da177e4SLinus Torvalds #define SHUT_RD 0 4371da177e4SLinus Torvalds #endif 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds #ifndef SHUT_WR 4401da177e4SLinus Torvalds #define SHUT_WR 1 4411da177e4SLinus Torvalds #endif 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds #ifndef SHUT_RDWR 4441da177e4SLinus Torvalds #define SHUT_RDWR 2 4451da177e4SLinus Torvalds #endif 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds int os_shutdown_socket(int fd, int r, int w) 4481da177e4SLinus Torvalds { 4491da177e4SLinus Torvalds int what, err; 4501da177e4SLinus Torvalds 4511adfd609SJeff Dike if (r && w) 4521adfd609SJeff Dike what = SHUT_RDWR; 4531adfd609SJeff Dike else if (r) 4541adfd609SJeff Dike what = SHUT_RD; 4551adfd609SJeff Dike else if (w) 4561adfd609SJeff Dike what = SHUT_WR; 4571adfd609SJeff Dike else 458108ffa8cSJeff Dike return -EINVAL; 4591adfd609SJeff Dike 4601da177e4SLinus Torvalds err = shutdown(fd, what); 4611da177e4SLinus Torvalds if (err < 0) 462108ffa8cSJeff Dike return -errno; 463108ffa8cSJeff Dike return 0; 4641da177e4SLinus Torvalds } 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds int os_rcv_fd(int fd, int *helper_pid_out) 4671da177e4SLinus Torvalds { 4681da177e4SLinus Torvalds int new, n; 4691da177e4SLinus Torvalds char buf[CMSG_SPACE(sizeof(new))]; 4701da177e4SLinus Torvalds struct msghdr msg; 4711da177e4SLinus Torvalds struct cmsghdr *cmsg; 4721da177e4SLinus Torvalds struct iovec iov; 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds msg.msg_name = NULL; 4751da177e4SLinus Torvalds msg.msg_namelen = 0; 4761da177e4SLinus Torvalds iov = ((struct iovec) { .iov_base = helper_pid_out, 4771da177e4SLinus Torvalds .iov_len = sizeof(*helper_pid_out) }); 4781da177e4SLinus Torvalds msg.msg_iov = &iov; 4791da177e4SLinus Torvalds msg.msg_iovlen = 1; 4801da177e4SLinus Torvalds msg.msg_control = buf; 4811da177e4SLinus Torvalds msg.msg_controllen = sizeof(buf); 4821da177e4SLinus Torvalds msg.msg_flags = 0; 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds n = recvmsg(fd, &msg, 0); 4851da177e4SLinus Torvalds if (n < 0) 486108ffa8cSJeff Dike return -errno; 487d4d5d205SJeff Dike else if (n != iov.iov_len) 4881da177e4SLinus Torvalds *helper_pid_out = -1; 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds cmsg = CMSG_FIRSTHDR(&msg); 4911da177e4SLinus Torvalds if (cmsg == NULL) { 4921adfd609SJeff Dike printk(UM_KERN_ERR "rcv_fd didn't receive anything, " 4931adfd609SJeff Dike "error = %d\n", errno); 494108ffa8cSJeff Dike return -1; 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds if ((cmsg->cmsg_level != SOL_SOCKET) || 4971da177e4SLinus Torvalds (cmsg->cmsg_type != SCM_RIGHTS)) { 4981adfd609SJeff Dike printk(UM_KERN_ERR "rcv_fd didn't receive a descriptor\n"); 499108ffa8cSJeff Dike return -1; 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds new = ((int *) CMSG_DATA(cmsg))[0]; 503108ffa8cSJeff Dike return new; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds 506c9a3072dSWANG Cong int os_create_unix_socket(const char *file, int len, int close_on_exec) 5071da177e4SLinus Torvalds { 5081da177e4SLinus Torvalds struct sockaddr_un addr; 5091da177e4SLinus Torvalds int sock, err; 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds sock = socket(PF_UNIX, SOCK_DGRAM, 0); 512b4fd310eSJeff Dike if (sock < 0) 513b4fd310eSJeff Dike return -errno; 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds if (close_on_exec) { 516512b6fb1SJeff Dike err = os_set_exec_close(sock); 5171da177e4SLinus Torvalds if (err < 0) 5181adfd609SJeff Dike printk(UM_KERN_ERR "create_unix_socket : " 5191adfd609SJeff Dike "close_on_exec failed, err = %d", -err); 5201da177e4SLinus Torvalds } 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds addr.sun_family = AF_UNIX; 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds snprintf(addr.sun_path, len, "%s", file); 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 527b4fd310eSJeff Dike if (err < 0) 528b4fd310eSJeff Dike return -errno; 5291da177e4SLinus Torvalds 530108ffa8cSJeff Dike return sock; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds void os_flush_stdout(void) 5341da177e4SLinus Torvalds { 5351da177e4SLinus Torvalds fflush(stdout); 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds int os_lock_file(int fd, int excl) 5391da177e4SLinus Torvalds { 5401da177e4SLinus Torvalds int type = excl ? F_WRLCK : F_RDLCK; 5411da177e4SLinus Torvalds struct flock lock = ((struct flock) { .l_type = type, 5421da177e4SLinus Torvalds .l_whence = SEEK_SET, 5431da177e4SLinus Torvalds .l_start = 0, 5441da177e4SLinus Torvalds .l_len = 0 } ); 5451da177e4SLinus Torvalds int err, save; 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds err = fcntl(fd, F_SETLK, &lock); 5481da177e4SLinus Torvalds if (!err) 5491da177e4SLinus Torvalds goto out; 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds save = -errno; 5521da177e4SLinus Torvalds err = fcntl(fd, F_GETLK, &lock); 5531da177e4SLinus Torvalds if (err) { 5541da177e4SLinus Torvalds err = -errno; 5551da177e4SLinus Torvalds goto out; 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds 5581adfd609SJeff Dike printk(UM_KERN_ERR "F_SETLK failed, file already locked by pid %d\n", 5591adfd609SJeff Dike lock.l_pid); 5601da177e4SLinus Torvalds err = save; 5611da177e4SLinus Torvalds out: 562108ffa8cSJeff Dike return err; 5631da177e4SLinus Torvalds } 564005a59ecSAl Viro 565005a59ecSAl Viro unsigned os_major(unsigned long long dev) 566005a59ecSAl Viro { 567005a59ecSAl Viro return major(dev); 568005a59ecSAl Viro } 569005a59ecSAl Viro 570005a59ecSAl Viro unsigned os_minor(unsigned long long dev) 571005a59ecSAl Viro { 572005a59ecSAl Viro return minor(dev); 573005a59ecSAl Viro } 574005a59ecSAl Viro 575005a59ecSAl Viro unsigned long long os_makedev(unsigned major, unsigned minor) 576005a59ecSAl Viro { 577005a59ecSAl Viro return makedev(major, minor); 578005a59ecSAl Viro } 579