11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Copyright (C) 2002 Jeff Dike (jdike@karaya.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/types.h> 121da177e4SLinus Torvalds #include <sys/stat.h> 131da177e4SLinus Torvalds #include <sys/socket.h> 141da177e4SLinus Torvalds #include <sys/un.h> 151da177e4SLinus Torvalds #include <sys/ioctl.h> 161da177e4SLinus Torvalds #include <sys/mount.h> 171da177e4SLinus Torvalds #include <sys/uio.h> 181da177e4SLinus Torvalds #include "os.h" 191da177e4SLinus Torvalds #include "user.h" 201da177e4SLinus Torvalds #include "kern_util.h" 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds static void copy_stat(struct uml_stat *dst, struct stat64 *src) 231da177e4SLinus Torvalds { 241da177e4SLinus Torvalds *dst = ((struct uml_stat) { 251da177e4SLinus Torvalds .ust_dev = src->st_dev, /* device */ 261da177e4SLinus Torvalds .ust_ino = src->st_ino, /* inode */ 271da177e4SLinus Torvalds .ust_mode = src->st_mode, /* protection */ 281da177e4SLinus Torvalds .ust_nlink = src->st_nlink, /* number of hard links */ 291da177e4SLinus Torvalds .ust_uid = src->st_uid, /* user ID of owner */ 301da177e4SLinus Torvalds .ust_gid = src->st_gid, /* group ID of owner */ 311da177e4SLinus Torvalds .ust_size = src->st_size, /* total size, in bytes */ 321da177e4SLinus Torvalds .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */ 331da177e4SLinus Torvalds .ust_blocks = src->st_blocks, /* number of blocks allocated */ 341da177e4SLinus Torvalds .ust_atime = src->st_atime, /* time of last access */ 351da177e4SLinus Torvalds .ust_mtime = src->st_mtime, /* time of last modification */ 361da177e4SLinus Torvalds .ust_ctime = src->st_ctime, /* time of last change */ 371da177e4SLinus Torvalds }); 381da177e4SLinus Torvalds } 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds int os_stat_fd(const int fd, struct uml_stat *ubuf) 411da177e4SLinus Torvalds { 421da177e4SLinus Torvalds struct stat64 sbuf; 431da177e4SLinus Torvalds int err; 441da177e4SLinus Torvalds 459ead6feeSJeff Dike CATCH_EINTR(err = fstat64(fd, &sbuf)); 461da177e4SLinus Torvalds if(err < 0) 47108ffa8cSJeff Dike return -errno; 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds if(ubuf != NULL) 501da177e4SLinus Torvalds copy_stat(ubuf, &sbuf); 51108ffa8cSJeff Dike return err; 521da177e4SLinus Torvalds } 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds int os_stat_file(const char *file_name, struct uml_stat *ubuf) 551da177e4SLinus Torvalds { 561da177e4SLinus Torvalds struct stat64 sbuf; 571da177e4SLinus Torvalds int err; 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds do { 601da177e4SLinus Torvalds err = stat64(file_name, &sbuf); 611da177e4SLinus Torvalds } while((err < 0) && (errno == EINTR)) ; 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds if(err < 0) 64108ffa8cSJeff Dike return -errno; 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds if(ubuf != NULL) 671da177e4SLinus Torvalds copy_stat(ubuf, &sbuf); 68108ffa8cSJeff Dike return err; 691da177e4SLinus Torvalds } 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds int os_access(const char* file, int mode) 721da177e4SLinus Torvalds { 731da177e4SLinus Torvalds int amode, err; 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds amode=(mode&OS_ACC_R_OK ? R_OK : 0) | (mode&OS_ACC_W_OK ? W_OK : 0) | 761da177e4SLinus Torvalds (mode&OS_ACC_X_OK ? X_OK : 0) | (mode&OS_ACC_F_OK ? F_OK : 0) ; 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds err = access(file, amode); 791da177e4SLinus Torvalds if(err < 0) 80108ffa8cSJeff Dike return -errno; 811da177e4SLinus Torvalds 82108ffa8cSJeff Dike return 0; 831da177e4SLinus Torvalds } 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */ 861da177e4SLinus Torvalds int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg) 871da177e4SLinus Torvalds { 881da177e4SLinus Torvalds int err; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds err = ioctl(fd, cmd, arg); 911da177e4SLinus Torvalds if(err < 0) 92108ffa8cSJeff Dike return -errno; 931da177e4SLinus Torvalds 94108ffa8cSJeff Dike return err; 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds /* FIXME: ensure namebuf in os_get_if_name is big enough */ 981da177e4SLinus Torvalds int os_get_ifname(int fd, char* namebuf) 991da177e4SLinus Torvalds { 1001da177e4SLinus Torvalds if(ioctl(fd, SIOCGIFNAME, namebuf) < 0) 101108ffa8cSJeff Dike return -errno; 1021da177e4SLinus Torvalds 103108ffa8cSJeff Dike return 0; 1041da177e4SLinus Torvalds } 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds int os_set_slip(int fd) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds int disc, sencap; 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds disc = N_SLIP; 111b4fd310eSJeff Dike if(ioctl(fd, TIOCSETD, &disc) < 0) 112b4fd310eSJeff Dike return -errno; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds sencap = 0; 115b4fd310eSJeff Dike if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0) 116b4fd310eSJeff Dike return -errno; 1171da177e4SLinus Torvalds 118108ffa8cSJeff Dike return 0; 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds int os_set_owner(int fd, int pid) 1221da177e4SLinus Torvalds { 1231da177e4SLinus Torvalds if(fcntl(fd, F_SETOWN, pid) < 0){ 1241da177e4SLinus Torvalds int save_errno = errno; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds if(fcntl(fd, F_GETOWN, 0) != pid) 127108ffa8cSJeff Dike return -save_errno; 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 130108ffa8cSJeff Dike return 0; 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds int os_mode_fd(int fd, int mode) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds int err; 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds do { 1381da177e4SLinus Torvalds err = fchmod(fd, mode); 1391da177e4SLinus Torvalds } while((err < 0) && (errno==EINTR)) ; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds if(err < 0) 142108ffa8cSJeff Dike return -errno; 1431da177e4SLinus Torvalds 144108ffa8cSJeff Dike return 0; 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds int os_file_type(char *file) 1481da177e4SLinus Torvalds { 1491da177e4SLinus Torvalds struct uml_stat buf; 1501da177e4SLinus Torvalds int err; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds err = os_stat_file(file, &buf); 1531da177e4SLinus Torvalds if(err < 0) 154108ffa8cSJeff Dike return err; 1551da177e4SLinus Torvalds 156108ffa8cSJeff Dike if(S_ISDIR(buf.ust_mode)) 157108ffa8cSJeff Dike return OS_TYPE_DIR; 158108ffa8cSJeff Dike else if(S_ISLNK(buf.ust_mode)) 159108ffa8cSJeff Dike return OS_TYPE_SYMLINK; 160108ffa8cSJeff Dike else if(S_ISCHR(buf.ust_mode)) 161108ffa8cSJeff Dike return OS_TYPE_CHARDEV; 162108ffa8cSJeff Dike else if(S_ISBLK(buf.ust_mode)) 163108ffa8cSJeff Dike return OS_TYPE_BLOCKDEV; 164108ffa8cSJeff Dike else if(S_ISFIFO(buf.ust_mode)) 165108ffa8cSJeff Dike return OS_TYPE_FIFO; 166108ffa8cSJeff Dike else if(S_ISSOCK(buf.ust_mode)) 167108ffa8cSJeff Dike return OS_TYPE_SOCK; 168108ffa8cSJeff Dike else return OS_TYPE_FILE; 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds int os_file_mode(char *file, struct openflags *mode_out) 1721da177e4SLinus Torvalds { 1731da177e4SLinus Torvalds int err; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds *mode_out = OPENFLAGS(); 1761da177e4SLinus Torvalds 177512b6fb1SJeff Dike err = access(file, W_OK); 178512b6fb1SJeff Dike if(err && (errno != EACCES)) 179512b6fb1SJeff Dike return -errno; 180512b6fb1SJeff Dike else if(!err) 1811da177e4SLinus Torvalds *mode_out = of_write(*mode_out); 1821da177e4SLinus Torvalds 183512b6fb1SJeff Dike err = access(file, R_OK); 184512b6fb1SJeff Dike if(err && (errno != EACCES)) 185512b6fb1SJeff Dike return -errno; 186512b6fb1SJeff Dike else if(!err) 1871da177e4SLinus Torvalds *mode_out = of_read(*mode_out); 1881da177e4SLinus Torvalds 189512b6fb1SJeff Dike return err; 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds int os_open_file(char *file, struct openflags flags, int mode) 1931da177e4SLinus Torvalds { 194b4fd310eSJeff Dike int fd, err, f = 0; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds if(flags.r && flags.w) f = O_RDWR; 1971da177e4SLinus Torvalds else if(flags.r) f = O_RDONLY; 1981da177e4SLinus Torvalds else if(flags.w) f = O_WRONLY; 1991da177e4SLinus Torvalds else f = 0; 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds if(flags.s) f |= O_SYNC; 2021da177e4SLinus Torvalds if(flags.c) f |= O_CREAT; 2031da177e4SLinus Torvalds if(flags.t) f |= O_TRUNC; 2041da177e4SLinus Torvalds if(flags.e) f |= O_EXCL; 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds fd = open64(file, f, mode); 2071da177e4SLinus Torvalds if(fd < 0) 208512b6fb1SJeff Dike return -errno; 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds if(flags.cl && fcntl(fd, F_SETFD, 1)){ 211b4fd310eSJeff Dike err = -errno; 212512b6fb1SJeff Dike close(fd); 213b4fd310eSJeff Dike return err; 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 216512b6fb1SJeff Dike return fd; 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds int os_connect_socket(char *name) 2201da177e4SLinus Torvalds { 2211da177e4SLinus Torvalds struct sockaddr_un sock; 2221da177e4SLinus Torvalds int fd, err; 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds sock.sun_family = AF_UNIX; 2251da177e4SLinus Torvalds snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name); 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds fd = socket(AF_UNIX, SOCK_STREAM, 0); 228dc1561acSPaolo 'Blaisorblade' Giarrusso if(fd < 0) { 229dc1561acSPaolo 'Blaisorblade' Giarrusso err = -errno; 230dc1561acSPaolo 'Blaisorblade' Giarrusso goto out; 231dc1561acSPaolo 'Blaisorblade' Giarrusso } 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); 234dc1561acSPaolo 'Blaisorblade' Giarrusso if(err) { 235dc1561acSPaolo 'Blaisorblade' Giarrusso err = -errno; 236dc1561acSPaolo 'Blaisorblade' Giarrusso goto out_close; 237dc1561acSPaolo 'Blaisorblade' Giarrusso } 2381da177e4SLinus Torvalds 239dc1561acSPaolo 'Blaisorblade' Giarrusso return fd; 240dc1561acSPaolo 'Blaisorblade' Giarrusso 241dc1561acSPaolo 'Blaisorblade' Giarrusso out_close: 242dc1561acSPaolo 'Blaisorblade' Giarrusso close(fd); 243dc1561acSPaolo 'Blaisorblade' Giarrusso out: 244dc1561acSPaolo 'Blaisorblade' Giarrusso return err; 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds void os_close_file(int fd) 2481da177e4SLinus Torvalds { 2491da177e4SLinus Torvalds close(fd); 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds 252ba180fd4SJeff Dike int os_seek_file(int fd, unsigned long long offset) 2531da177e4SLinus Torvalds { 254ba180fd4SJeff Dike unsigned long long actual; 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds actual = lseek64(fd, offset, SEEK_SET); 2571da177e4SLinus Torvalds if(actual != offset) 258108ffa8cSJeff Dike return -errno; 259108ffa8cSJeff Dike return 0; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds int os_read_file(int fd, void *buf, int len) 2631da177e4SLinus Torvalds { 2643d564047SJeff Dike int n = read(fd, buf, len); 2653d564047SJeff Dike 2663d564047SJeff Dike if(n < 0) 2673d564047SJeff Dike return -errno; 2683d564047SJeff Dike return n; 2693d564047SJeff Dike } 2703d564047SJeff Dike 2711da177e4SLinus Torvalds int os_write_file(int fd, const void *buf, int len) 2721da177e4SLinus Torvalds { 2733d564047SJeff Dike int n = write(fd, (void *) buf, len); 2743d564047SJeff Dike 2753d564047SJeff Dike if(n < 0) 2763d564047SJeff Dike return -errno; 2773d564047SJeff Dike return n; 2783d564047SJeff Dike } 2793d564047SJeff Dike 280da00d9a5SJeff Dike int os_file_size(char *file, unsigned long long *size_out) 2811da177e4SLinus Torvalds { 2821da177e4SLinus Torvalds struct uml_stat buf; 2831da177e4SLinus Torvalds int err; 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds err = os_stat_file(file, &buf); 2861da177e4SLinus Torvalds if(err < 0){ 2871da177e4SLinus Torvalds printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 288512b6fb1SJeff Dike return err; 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds if(S_ISBLK(buf.ust_mode)){ 2922c392a4fSNicolas George int fd; 2932c392a4fSNicolas George long blocks; 2941da177e4SLinus Torvalds 295512b6fb1SJeff Dike fd = open(file, O_RDONLY, 0); 2961da177e4SLinus Torvalds if(fd < 0) { 297512b6fb1SJeff Dike err = -errno; 298512b6fb1SJeff Dike printk("Couldn't open \"%s\", errno = %d\n", file, 299512b6fb1SJeff Dike errno); 300512b6fb1SJeff Dike return err; 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds if(ioctl(fd, BLKGETSIZE, &blocks) < 0){ 303b4fd310eSJeff Dike err = -errno; 3041da177e4SLinus Torvalds printk("Couldn't get the block size of \"%s\", " 3051da177e4SLinus Torvalds "errno = %d\n", file, errno); 306512b6fb1SJeff Dike close(fd); 307512b6fb1SJeff Dike return err; 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds *size_out = ((long long) blocks) * 512; 310512b6fb1SJeff Dike close(fd); 3111da177e4SLinus Torvalds } 312512b6fb1SJeff Dike else *size_out = buf.ust_size; 313512b6fb1SJeff Dike 314512b6fb1SJeff Dike return 0; 3151da177e4SLinus Torvalds } 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds int os_file_modtime(char *file, unsigned long *modtime) 3181da177e4SLinus Torvalds { 3191da177e4SLinus Torvalds struct uml_stat buf; 3201da177e4SLinus Torvalds int err; 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds err = os_stat_file(file, &buf); 3231da177e4SLinus Torvalds if(err < 0){ 3241da177e4SLinus Torvalds printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 325108ffa8cSJeff Dike return err; 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds *modtime = buf.ust_mtime; 329108ffa8cSJeff Dike return 0; 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds int os_get_exec_close(int fd, int *close_on_exec) 3331da177e4SLinus Torvalds { 3341da177e4SLinus Torvalds int ret; 3351da177e4SLinus Torvalds 336512b6fb1SJeff Dike CATCH_EINTR(ret = fcntl(fd, F_GETFD)); 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds if(ret < 0) 339512b6fb1SJeff Dike return -errno; 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds *close_on_exec = (ret & FD_CLOEXEC) ? 1 : 0; 342512b6fb1SJeff Dike return ret; 3431da177e4SLinus Torvalds } 3441da177e4SLinus Torvalds 345512b6fb1SJeff Dike int os_set_exec_close(int fd) 3461da177e4SLinus Torvalds { 347512b6fb1SJeff Dike int err; 3481da177e4SLinus Torvalds 349512b6fb1SJeff Dike CATCH_EINTR(err = fcntl(fd, F_SETFD, FD_CLOEXEC)); 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds if(err < 0) 352512b6fb1SJeff Dike return -errno; 353512b6fb1SJeff Dike return err; 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds int os_pipe(int *fds, int stream, int close_on_exec) 3571da177e4SLinus Torvalds { 3581da177e4SLinus Torvalds int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds err = socketpair(AF_UNIX, type, 0, fds); 3611da177e4SLinus Torvalds if(err < 0) 362512b6fb1SJeff Dike return -errno; 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds if(!close_on_exec) 365512b6fb1SJeff Dike return 0; 3661da177e4SLinus Torvalds 367512b6fb1SJeff Dike err = os_set_exec_close(fds[0]); 3681da177e4SLinus Torvalds if(err < 0) 3691da177e4SLinus Torvalds goto error; 3701da177e4SLinus Torvalds 371512b6fb1SJeff Dike err = os_set_exec_close(fds[1]); 3721da177e4SLinus Torvalds if(err < 0) 3731da177e4SLinus Torvalds goto error; 3741da177e4SLinus Torvalds 375108ffa8cSJeff Dike return 0; 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds error: 3781da177e4SLinus Torvalds printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err); 379512b6fb1SJeff Dike close(fds[1]); 380512b6fb1SJeff Dike close(fds[0]); 381512b6fb1SJeff Dike return err; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds int os_set_fd_async(int fd, int owner) 3851da177e4SLinus Torvalds { 386b4fd310eSJeff Dike int err; 387b4fd310eSJeff Dike 3881da177e4SLinus Torvalds /* XXX This should do F_GETFL first */ 3891da177e4SLinus Torvalds if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){ 390b4fd310eSJeff Dike err = -errno; 3911da177e4SLinus Torvalds printk("os_set_fd_async : failed to set O_ASYNC and " 3921da177e4SLinus Torvalds "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 393b4fd310eSJeff Dike return err; 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds #ifdef notdef 3961da177e4SLinus Torvalds if(fcntl(fd, F_SETFD, 1) < 0){ 3971da177e4SLinus Torvalds printk("os_set_fd_async : Setting FD_CLOEXEC failed, " 3981da177e4SLinus Torvalds "errno = %d\n", errno); 3991da177e4SLinus Torvalds } 4001da177e4SLinus Torvalds #endif 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds if((fcntl(fd, F_SETSIG, SIGIO) < 0) || 4031da177e4SLinus Torvalds (fcntl(fd, F_SETOWN, owner) < 0)){ 404b4fd310eSJeff Dike err = -errno; 4051da177e4SLinus Torvalds printk("os_set_fd_async : Failed to fcntl F_SETOWN " 4061da177e4SLinus Torvalds "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd, 4071da177e4SLinus Torvalds owner, errno); 408b4fd310eSJeff Dike return err; 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds 411108ffa8cSJeff Dike return 0; 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds int os_clear_fd_async(int fd) 4151da177e4SLinus Torvalds { 4161da177e4SLinus Torvalds int flags = fcntl(fd, F_GETFL); 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds flags &= ~(O_ASYNC | O_NONBLOCK); 4191da177e4SLinus Torvalds if(fcntl(fd, F_SETFL, flags) < 0) 420108ffa8cSJeff Dike return -errno; 421108ffa8cSJeff Dike return 0; 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds int os_set_fd_block(int fd, int blocking) 4251da177e4SLinus Torvalds { 4261da177e4SLinus Torvalds int flags; 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds flags = fcntl(fd, F_GETFL); 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds if(blocking) flags &= ~O_NONBLOCK; 4311da177e4SLinus Torvalds else flags |= O_NONBLOCK; 4321da177e4SLinus Torvalds 433b4fd310eSJeff Dike if(fcntl(fd, F_SETFL, flags) < 0) 434b4fd310eSJeff Dike return -errno; 435b4fd310eSJeff Dike 436108ffa8cSJeff Dike return 0; 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds int os_accept_connection(int fd) 4401da177e4SLinus Torvalds { 4411da177e4SLinus Torvalds int new; 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds new = accept(fd, NULL, 0); 4441da177e4SLinus Torvalds if(new < 0) 445108ffa8cSJeff Dike return -errno; 446108ffa8cSJeff Dike return new; 4471da177e4SLinus Torvalds } 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds #ifndef SHUT_RD 4501da177e4SLinus Torvalds #define SHUT_RD 0 4511da177e4SLinus Torvalds #endif 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds #ifndef SHUT_WR 4541da177e4SLinus Torvalds #define SHUT_WR 1 4551da177e4SLinus Torvalds #endif 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds #ifndef SHUT_RDWR 4581da177e4SLinus Torvalds #define SHUT_RDWR 2 4591da177e4SLinus Torvalds #endif 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds int os_shutdown_socket(int fd, int r, int w) 4621da177e4SLinus Torvalds { 4631da177e4SLinus Torvalds int what, err; 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds if(r && w) what = SHUT_RDWR; 4661da177e4SLinus Torvalds else if(r) what = SHUT_RD; 4671da177e4SLinus Torvalds else if(w) what = SHUT_WR; 4681da177e4SLinus Torvalds else { 4691da177e4SLinus Torvalds printk("os_shutdown_socket : neither r or w was set\n"); 470108ffa8cSJeff Dike return -EINVAL; 4711da177e4SLinus Torvalds } 4721da177e4SLinus Torvalds err = shutdown(fd, what); 4731da177e4SLinus Torvalds if(err < 0) 474108ffa8cSJeff Dike return -errno; 475108ffa8cSJeff Dike return 0; 4761da177e4SLinus Torvalds } 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds int os_rcv_fd(int fd, int *helper_pid_out) 4791da177e4SLinus Torvalds { 4801da177e4SLinus Torvalds int new, n; 4811da177e4SLinus Torvalds char buf[CMSG_SPACE(sizeof(new))]; 4821da177e4SLinus Torvalds struct msghdr msg; 4831da177e4SLinus Torvalds struct cmsghdr *cmsg; 4841da177e4SLinus Torvalds struct iovec iov; 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds msg.msg_name = NULL; 4871da177e4SLinus Torvalds msg.msg_namelen = 0; 4881da177e4SLinus Torvalds iov = ((struct iovec) { .iov_base = helper_pid_out, 4891da177e4SLinus Torvalds .iov_len = sizeof(*helper_pid_out) }); 4901da177e4SLinus Torvalds msg.msg_iov = &iov; 4911da177e4SLinus Torvalds msg.msg_iovlen = 1; 4921da177e4SLinus Torvalds msg.msg_control = buf; 4931da177e4SLinus Torvalds msg.msg_controllen = sizeof(buf); 4941da177e4SLinus Torvalds msg.msg_flags = 0; 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds n = recvmsg(fd, &msg, 0); 4971da177e4SLinus Torvalds if(n < 0) 498108ffa8cSJeff Dike return -errno; 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds else if(n != sizeof(iov.iov_len)) 5011da177e4SLinus Torvalds *helper_pid_out = -1; 5021da177e4SLinus Torvalds 5031da177e4SLinus Torvalds cmsg = CMSG_FIRSTHDR(&msg); 5041da177e4SLinus Torvalds if(cmsg == NULL){ 5051da177e4SLinus Torvalds printk("rcv_fd didn't receive anything, error = %d\n", errno); 506108ffa8cSJeff Dike return -1; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds if((cmsg->cmsg_level != SOL_SOCKET) || 5091da177e4SLinus Torvalds (cmsg->cmsg_type != SCM_RIGHTS)){ 5101da177e4SLinus Torvalds printk("rcv_fd didn't receive a descriptor\n"); 511108ffa8cSJeff Dike return -1; 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds new = ((int *) CMSG_DATA(cmsg))[0]; 515108ffa8cSJeff Dike return new; 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds int os_create_unix_socket(char *file, int len, int close_on_exec) 5191da177e4SLinus Torvalds { 5201da177e4SLinus Torvalds struct sockaddr_un addr; 5211da177e4SLinus Torvalds int sock, err; 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds sock = socket(PF_UNIX, SOCK_DGRAM, 0); 524b4fd310eSJeff Dike if(sock < 0) 525b4fd310eSJeff Dike return -errno; 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds if(close_on_exec) { 528512b6fb1SJeff Dike err = os_set_exec_close(sock); 5291da177e4SLinus Torvalds if(err < 0) 5301da177e4SLinus Torvalds printk("create_unix_socket : close_on_exec failed, " 5311da177e4SLinus Torvalds "err = %d", -err); 5321da177e4SLinus Torvalds } 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds addr.sun_family = AF_UNIX; 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds /* XXX Be more careful about overflow */ 5371da177e4SLinus Torvalds snprintf(addr.sun_path, len, "%s", file); 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 540b4fd310eSJeff Dike if(err < 0) 541b4fd310eSJeff Dike return -errno; 5421da177e4SLinus Torvalds 543108ffa8cSJeff Dike return sock; 5441da177e4SLinus Torvalds } 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds void os_flush_stdout(void) 5471da177e4SLinus Torvalds { 5481da177e4SLinus Torvalds fflush(stdout); 5491da177e4SLinus Torvalds } 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds int os_lock_file(int fd, int excl) 5521da177e4SLinus Torvalds { 5531da177e4SLinus Torvalds int type = excl ? F_WRLCK : F_RDLCK; 5541da177e4SLinus Torvalds struct flock lock = ((struct flock) { .l_type = type, 5551da177e4SLinus Torvalds .l_whence = SEEK_SET, 5561da177e4SLinus Torvalds .l_start = 0, 5571da177e4SLinus Torvalds .l_len = 0 } ); 5581da177e4SLinus Torvalds int err, save; 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds err = fcntl(fd, F_SETLK, &lock); 5611da177e4SLinus Torvalds if(!err) 5621da177e4SLinus Torvalds goto out; 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds save = -errno; 5651da177e4SLinus Torvalds err = fcntl(fd, F_GETLK, &lock); 5661da177e4SLinus Torvalds if(err){ 5671da177e4SLinus Torvalds err = -errno; 5681da177e4SLinus Torvalds goto out; 5691da177e4SLinus Torvalds } 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid); 5721da177e4SLinus Torvalds err = save; 5731da177e4SLinus Torvalds out: 574108ffa8cSJeff Dike return err; 5751da177e4SLinus Torvalds } 576