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 void os_print_error(int error, const char* str) 861da177e4SLinus Torvalds { 871da177e4SLinus Torvalds errno = error < 0 ? -error : error; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds perror(str); 901da177e4SLinus Torvalds } 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */ 931da177e4SLinus Torvalds int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg) 941da177e4SLinus Torvalds { 951da177e4SLinus Torvalds int err; 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds err = ioctl(fd, cmd, arg); 981da177e4SLinus Torvalds if(err < 0) 99108ffa8cSJeff Dike return -errno; 1001da177e4SLinus Torvalds 101108ffa8cSJeff Dike return err; 1021da177e4SLinus Torvalds } 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds int os_window_size(int fd, int *rows, int *cols) 1051da177e4SLinus Torvalds { 1061da177e4SLinus Torvalds struct winsize size; 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds if(ioctl(fd, TIOCGWINSZ, &size) < 0) 109108ffa8cSJeff Dike return -errno; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds *rows = size.ws_row; 1121da177e4SLinus Torvalds *cols = size.ws_col; 1131da177e4SLinus Torvalds 114108ffa8cSJeff Dike return 0; 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds int os_new_tty_pgrp(int fd, int pid) 1181da177e4SLinus Torvalds { 119b4fd310eSJeff Dike if(ioctl(fd, TIOCSCTTY, 0) < 0) 120b4fd310eSJeff Dike return -errno; 1211da177e4SLinus Torvalds 122b4fd310eSJeff Dike if(tcsetpgrp(fd, pid) < 0) 123b4fd310eSJeff Dike return -errno; 1241da177e4SLinus Torvalds 125108ffa8cSJeff Dike return 0; 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds /* FIXME: ensure namebuf in os_get_if_name is big enough */ 1291da177e4SLinus Torvalds int os_get_ifname(int fd, char* namebuf) 1301da177e4SLinus Torvalds { 1311da177e4SLinus Torvalds if(ioctl(fd, SIOCGIFNAME, namebuf) < 0) 132108ffa8cSJeff Dike return -errno; 1331da177e4SLinus Torvalds 134108ffa8cSJeff Dike return 0; 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds int os_set_slip(int fd) 1381da177e4SLinus Torvalds { 1391da177e4SLinus Torvalds int disc, sencap; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds disc = N_SLIP; 142b4fd310eSJeff Dike if(ioctl(fd, TIOCSETD, &disc) < 0) 143b4fd310eSJeff Dike return -errno; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds sencap = 0; 146b4fd310eSJeff Dike if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0) 147b4fd310eSJeff Dike return -errno; 1481da177e4SLinus Torvalds 149108ffa8cSJeff Dike return 0; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds int os_set_owner(int fd, int pid) 1531da177e4SLinus Torvalds { 1541da177e4SLinus Torvalds if(fcntl(fd, F_SETOWN, pid) < 0){ 1551da177e4SLinus Torvalds int save_errno = errno; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds if(fcntl(fd, F_GETOWN, 0) != pid) 158108ffa8cSJeff Dike return -save_errno; 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 161108ffa8cSJeff Dike return 0; 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds int os_mode_fd(int fd, int mode) 1651da177e4SLinus Torvalds { 1661da177e4SLinus Torvalds int err; 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds do { 1691da177e4SLinus Torvalds err = fchmod(fd, mode); 1701da177e4SLinus Torvalds } while((err < 0) && (errno==EINTR)) ; 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds if(err < 0) 173108ffa8cSJeff Dike return -errno; 1741da177e4SLinus Torvalds 175108ffa8cSJeff Dike return 0; 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds int os_file_type(char *file) 1791da177e4SLinus Torvalds { 1801da177e4SLinus Torvalds struct uml_stat buf; 1811da177e4SLinus Torvalds int err; 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds err = os_stat_file(file, &buf); 1841da177e4SLinus Torvalds if(err < 0) 185108ffa8cSJeff Dike return err; 1861da177e4SLinus Torvalds 187108ffa8cSJeff Dike if(S_ISDIR(buf.ust_mode)) 188108ffa8cSJeff Dike return OS_TYPE_DIR; 189108ffa8cSJeff Dike else if(S_ISLNK(buf.ust_mode)) 190108ffa8cSJeff Dike return OS_TYPE_SYMLINK; 191108ffa8cSJeff Dike else if(S_ISCHR(buf.ust_mode)) 192108ffa8cSJeff Dike return OS_TYPE_CHARDEV; 193108ffa8cSJeff Dike else if(S_ISBLK(buf.ust_mode)) 194108ffa8cSJeff Dike return OS_TYPE_BLOCKDEV; 195108ffa8cSJeff Dike else if(S_ISFIFO(buf.ust_mode)) 196108ffa8cSJeff Dike return OS_TYPE_FIFO; 197108ffa8cSJeff Dike else if(S_ISSOCK(buf.ust_mode)) 198108ffa8cSJeff Dike return OS_TYPE_SOCK; 199108ffa8cSJeff Dike else return OS_TYPE_FILE; 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds int os_file_mode(char *file, struct openflags *mode_out) 2031da177e4SLinus Torvalds { 2041da177e4SLinus Torvalds int err; 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds *mode_out = OPENFLAGS(); 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds err = os_access(file, OS_ACC_W_OK); 2091da177e4SLinus Torvalds if((err < 0) && (err != -EACCES)) 2101da177e4SLinus Torvalds return(err); 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds *mode_out = of_write(*mode_out); 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds err = os_access(file, OS_ACC_R_OK); 2151da177e4SLinus Torvalds if((err < 0) && (err != -EACCES)) 2161da177e4SLinus Torvalds return(err); 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds *mode_out = of_read(*mode_out); 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds return(0); 2211da177e4SLinus Torvalds } 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds int os_open_file(char *file, struct openflags flags, int mode) 2241da177e4SLinus Torvalds { 225b4fd310eSJeff Dike int fd, err, f = 0; 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds if(flags.r && flags.w) f = O_RDWR; 2281da177e4SLinus Torvalds else if(flags.r) f = O_RDONLY; 2291da177e4SLinus Torvalds else if(flags.w) f = O_WRONLY; 2301da177e4SLinus Torvalds else f = 0; 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds if(flags.s) f |= O_SYNC; 2331da177e4SLinus Torvalds if(flags.c) f |= O_CREAT; 2341da177e4SLinus Torvalds if(flags.t) f |= O_TRUNC; 2351da177e4SLinus Torvalds if(flags.e) f |= O_EXCL; 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds fd = open64(file, f, mode); 2381da177e4SLinus Torvalds if(fd < 0) 2391da177e4SLinus Torvalds return(-errno); 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds if(flags.cl && fcntl(fd, F_SETFD, 1)){ 242b4fd310eSJeff Dike err = -errno; 2431da177e4SLinus Torvalds os_close_file(fd); 244b4fd310eSJeff Dike return err; 2451da177e4SLinus Torvalds } 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds return(fd); 2481da177e4SLinus Torvalds } 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds int os_connect_socket(char *name) 2511da177e4SLinus Torvalds { 2521da177e4SLinus Torvalds struct sockaddr_un sock; 2531da177e4SLinus Torvalds int fd, err; 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds sock.sun_family = AF_UNIX; 2561da177e4SLinus Torvalds snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name); 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds fd = socket(AF_UNIX, SOCK_STREAM, 0); 259dc1561acSPaolo 'Blaisorblade' Giarrusso if(fd < 0) { 260dc1561acSPaolo 'Blaisorblade' Giarrusso err = -errno; 261dc1561acSPaolo 'Blaisorblade' Giarrusso goto out; 262dc1561acSPaolo 'Blaisorblade' Giarrusso } 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); 265dc1561acSPaolo 'Blaisorblade' Giarrusso if(err) { 266dc1561acSPaolo 'Blaisorblade' Giarrusso err = -errno; 267dc1561acSPaolo 'Blaisorblade' Giarrusso goto out_close; 268dc1561acSPaolo 'Blaisorblade' Giarrusso } 2691da177e4SLinus Torvalds 270dc1561acSPaolo 'Blaisorblade' Giarrusso return fd; 271dc1561acSPaolo 'Blaisorblade' Giarrusso 272dc1561acSPaolo 'Blaisorblade' Giarrusso out_close: 273dc1561acSPaolo 'Blaisorblade' Giarrusso close(fd); 274dc1561acSPaolo 'Blaisorblade' Giarrusso out: 275dc1561acSPaolo 'Blaisorblade' Giarrusso return err; 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds void os_close_file(int fd) 2791da177e4SLinus Torvalds { 2801da177e4SLinus Torvalds close(fd); 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds int os_seek_file(int fd, __u64 offset) 2841da177e4SLinus Torvalds { 2851da177e4SLinus Torvalds __u64 actual; 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds actual = lseek64(fd, offset, SEEK_SET); 2881da177e4SLinus Torvalds if(actual != offset) 289108ffa8cSJeff Dike return -errno; 290108ffa8cSJeff Dike return 0; 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds static int fault_buffer(void *start, int len, 2941da177e4SLinus Torvalds int (*copy_proc)(void *addr, void *buf, int len)) 2951da177e4SLinus Torvalds { 2961da177e4SLinus Torvalds int page = getpagesize(), i; 2971da177e4SLinus Torvalds char c; 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds for(i = 0; i < len; i += page){ 3001da177e4SLinus Torvalds if((*copy_proc)(start + i, &c, sizeof(c))) 301108ffa8cSJeff Dike return -EFAULT; 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds if((len % page) != 0){ 3041da177e4SLinus Torvalds if((*copy_proc)(start + len - 1, &c, sizeof(c))) 305108ffa8cSJeff Dike return -EFAULT; 3061da177e4SLinus Torvalds } 307108ffa8cSJeff Dike return 0; 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds static int file_io(int fd, void *buf, int len, 3111da177e4SLinus Torvalds int (*io_proc)(int fd, void *buf, int len), 3121da177e4SLinus Torvalds int (*copy_user_proc)(void *addr, void *buf, int len)) 3131da177e4SLinus Torvalds { 3141da177e4SLinus Torvalds int n, err; 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds do { 3171da177e4SLinus Torvalds n = (*io_proc)(fd, buf, len); 3181da177e4SLinus Torvalds if((n < 0) && (errno == EFAULT)){ 3191da177e4SLinus Torvalds err = fault_buffer(buf, len, copy_user_proc); 3201da177e4SLinus Torvalds if(err) 321108ffa8cSJeff Dike return err; 3221da177e4SLinus Torvalds n = (*io_proc)(fd, buf, len); 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds } while((n < 0) && (errno == EINTR)); 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds if(n < 0) 327108ffa8cSJeff Dike return -errno; 328108ffa8cSJeff Dike return n; 3291da177e4SLinus Torvalds } 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds int os_read_file(int fd, void *buf, int len) 3321da177e4SLinus Torvalds { 333108ffa8cSJeff Dike return file_io(fd, buf, len, (int (*)(int, void *, int)) read, 334108ffa8cSJeff Dike copy_from_user_proc); 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds 3373d564047SJeff Dike int os_read_file_k(int fd, void *buf, int len) 3383d564047SJeff Dike { 3393d564047SJeff Dike int n = read(fd, buf, len); 3403d564047SJeff Dike 3413d564047SJeff Dike if(n < 0) 3423d564047SJeff Dike return -errno; 3433d564047SJeff Dike return n; 3443d564047SJeff Dike } 3453d564047SJeff Dike 3461da177e4SLinus Torvalds int os_write_file(int fd, const void *buf, int len) 3471da177e4SLinus Torvalds { 348108ffa8cSJeff Dike return file_io(fd, (void *) buf, len, 349108ffa8cSJeff Dike (int (*)(int, void *, int)) write, copy_to_user_proc); 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3523d564047SJeff Dike int os_write_file_k(int fd, const void *buf, int len) 3533d564047SJeff Dike { 3543d564047SJeff Dike int n = write(fd, (void *) buf, len); 3553d564047SJeff Dike 3563d564047SJeff Dike if(n < 0) 3573d564047SJeff Dike return -errno; 3583d564047SJeff Dike return n; 3593d564047SJeff Dike } 3603d564047SJeff Dike 361da00d9a5SJeff Dike int os_file_size(char *file, unsigned long long *size_out) 3621da177e4SLinus Torvalds { 3631da177e4SLinus Torvalds struct uml_stat buf; 3641da177e4SLinus Torvalds int err; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds err = os_stat_file(file, &buf); 3671da177e4SLinus Torvalds if(err < 0){ 3681da177e4SLinus Torvalds printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 3691da177e4SLinus Torvalds return(err); 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds if(S_ISBLK(buf.ust_mode)){ 3731da177e4SLinus Torvalds int fd, blocks; 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds fd = os_open_file(file, of_read(OPENFLAGS()), 0); 3761da177e4SLinus Torvalds if(fd < 0){ 3771da177e4SLinus Torvalds printk("Couldn't open \"%s\", errno = %d\n", file, -fd); 3781da177e4SLinus Torvalds return(fd); 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds if(ioctl(fd, BLKGETSIZE, &blocks) < 0){ 381b4fd310eSJeff Dike err = -errno; 3821da177e4SLinus Torvalds printk("Couldn't get the block size of \"%s\", " 3831da177e4SLinus Torvalds "errno = %d\n", file, errno); 3841da177e4SLinus Torvalds os_close_file(fd); 3851da177e4SLinus Torvalds return(err); 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds *size_out = ((long long) blocks) * 512; 3881da177e4SLinus Torvalds os_close_file(fd); 3891da177e4SLinus Torvalds return(0); 3901da177e4SLinus Torvalds } 3911da177e4SLinus Torvalds *size_out = buf.ust_size; 3921da177e4SLinus Torvalds return(0); 3931da177e4SLinus Torvalds } 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds int os_file_modtime(char *file, unsigned long *modtime) 3961da177e4SLinus Torvalds { 3971da177e4SLinus Torvalds struct uml_stat buf; 3981da177e4SLinus Torvalds int err; 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds err = os_stat_file(file, &buf); 4011da177e4SLinus Torvalds if(err < 0){ 4021da177e4SLinus Torvalds printk("Couldn't stat \"%s\" : err = %d\n", file, -err); 403108ffa8cSJeff Dike return err; 4041da177e4SLinus Torvalds } 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds *modtime = buf.ust_mtime; 407108ffa8cSJeff Dike return 0; 4081da177e4SLinus Torvalds } 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds int os_get_exec_close(int fd, int* close_on_exec) 4111da177e4SLinus Torvalds { 4121da177e4SLinus Torvalds int ret; 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds do { 4151da177e4SLinus Torvalds ret = fcntl(fd, F_GETFD); 4161da177e4SLinus Torvalds } while((ret < 0) && (errno == EINTR)) ; 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds if(ret < 0) 4191da177e4SLinus Torvalds return(-errno); 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds *close_on_exec = (ret&FD_CLOEXEC) ? 1 : 0; 4221da177e4SLinus Torvalds return(ret); 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds int os_set_exec_close(int fd, int close_on_exec) 4261da177e4SLinus Torvalds { 4271da177e4SLinus Torvalds int flag, err; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds if(close_on_exec) flag = FD_CLOEXEC; 4301da177e4SLinus Torvalds else flag = 0; 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds do { 4331da177e4SLinus Torvalds err = fcntl(fd, F_SETFD, flag); 4341da177e4SLinus Torvalds } while((err < 0) && (errno == EINTR)) ; 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds if(err < 0) 4371da177e4SLinus Torvalds return(-errno); 4381da177e4SLinus Torvalds return(err); 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds int os_pipe(int *fds, int stream, int close_on_exec) 4421da177e4SLinus Torvalds { 4431da177e4SLinus Torvalds int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds err = socketpair(AF_UNIX, type, 0, fds); 4461da177e4SLinus Torvalds if(err < 0) 4471da177e4SLinus Torvalds return(-errno); 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds if(!close_on_exec) 4501da177e4SLinus Torvalds return(0); 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds err = os_set_exec_close(fds[0], 1); 4531da177e4SLinus Torvalds if(err < 0) 4541da177e4SLinus Torvalds goto error; 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds err = os_set_exec_close(fds[1], 1); 4571da177e4SLinus Torvalds if(err < 0) 4581da177e4SLinus Torvalds goto error; 4591da177e4SLinus Torvalds 460108ffa8cSJeff Dike return 0; 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds error: 4631da177e4SLinus Torvalds printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err); 4641da177e4SLinus Torvalds os_close_file(fds[1]); 4651da177e4SLinus Torvalds os_close_file(fds[0]); 4661da177e4SLinus Torvalds return(err); 4671da177e4SLinus Torvalds } 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds int os_set_fd_async(int fd, int owner) 4701da177e4SLinus Torvalds { 471b4fd310eSJeff Dike int err; 472b4fd310eSJeff Dike 4731da177e4SLinus Torvalds /* XXX This should do F_GETFL first */ 4741da177e4SLinus Torvalds if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){ 475b4fd310eSJeff Dike err = -errno; 4761da177e4SLinus Torvalds printk("os_set_fd_async : failed to set O_ASYNC and " 4771da177e4SLinus Torvalds "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); 478b4fd310eSJeff Dike return err; 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds #ifdef notdef 4811da177e4SLinus Torvalds if(fcntl(fd, F_SETFD, 1) < 0){ 4821da177e4SLinus Torvalds printk("os_set_fd_async : Setting FD_CLOEXEC failed, " 4831da177e4SLinus Torvalds "errno = %d\n", errno); 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds #endif 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds if((fcntl(fd, F_SETSIG, SIGIO) < 0) || 4881da177e4SLinus Torvalds (fcntl(fd, F_SETOWN, owner) < 0)){ 489b4fd310eSJeff Dike err = -errno; 4901da177e4SLinus Torvalds printk("os_set_fd_async : Failed to fcntl F_SETOWN " 4911da177e4SLinus Torvalds "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd, 4921da177e4SLinus Torvalds owner, errno); 493b4fd310eSJeff Dike return err; 4941da177e4SLinus Torvalds } 4951da177e4SLinus Torvalds 496108ffa8cSJeff Dike return 0; 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds int os_clear_fd_async(int fd) 5001da177e4SLinus Torvalds { 5011da177e4SLinus Torvalds int flags = fcntl(fd, F_GETFL); 5021da177e4SLinus Torvalds 5031da177e4SLinus Torvalds flags &= ~(O_ASYNC | O_NONBLOCK); 5041da177e4SLinus Torvalds if(fcntl(fd, F_SETFL, flags) < 0) 505108ffa8cSJeff Dike return -errno; 506108ffa8cSJeff Dike return 0; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds int os_set_fd_block(int fd, int blocking) 5101da177e4SLinus Torvalds { 5111da177e4SLinus Torvalds int flags; 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds flags = fcntl(fd, F_GETFL); 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds if(blocking) flags &= ~O_NONBLOCK; 5161da177e4SLinus Torvalds else flags |= O_NONBLOCK; 5171da177e4SLinus Torvalds 518b4fd310eSJeff Dike if(fcntl(fd, F_SETFL, flags) < 0) 519b4fd310eSJeff Dike return -errno; 520b4fd310eSJeff Dike 521108ffa8cSJeff Dike return 0; 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds 5241da177e4SLinus Torvalds int os_accept_connection(int fd) 5251da177e4SLinus Torvalds { 5261da177e4SLinus Torvalds int new; 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds new = accept(fd, NULL, 0); 5291da177e4SLinus Torvalds if(new < 0) 530108ffa8cSJeff Dike return -errno; 531108ffa8cSJeff Dike return new; 5321da177e4SLinus Torvalds } 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds #ifndef SHUT_RD 5351da177e4SLinus Torvalds #define SHUT_RD 0 5361da177e4SLinus Torvalds #endif 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds #ifndef SHUT_WR 5391da177e4SLinus Torvalds #define SHUT_WR 1 5401da177e4SLinus Torvalds #endif 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds #ifndef SHUT_RDWR 5431da177e4SLinus Torvalds #define SHUT_RDWR 2 5441da177e4SLinus Torvalds #endif 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds int os_shutdown_socket(int fd, int r, int w) 5471da177e4SLinus Torvalds { 5481da177e4SLinus Torvalds int what, err; 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds if(r && w) what = SHUT_RDWR; 5511da177e4SLinus Torvalds else if(r) what = SHUT_RD; 5521da177e4SLinus Torvalds else if(w) what = SHUT_WR; 5531da177e4SLinus Torvalds else { 5541da177e4SLinus Torvalds printk("os_shutdown_socket : neither r or w was set\n"); 555108ffa8cSJeff Dike return -EINVAL; 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds err = shutdown(fd, what); 5581da177e4SLinus Torvalds if(err < 0) 559108ffa8cSJeff Dike return -errno; 560108ffa8cSJeff Dike return 0; 5611da177e4SLinus Torvalds } 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds int os_rcv_fd(int fd, int *helper_pid_out) 5641da177e4SLinus Torvalds { 5651da177e4SLinus Torvalds int new, n; 5661da177e4SLinus Torvalds char buf[CMSG_SPACE(sizeof(new))]; 5671da177e4SLinus Torvalds struct msghdr msg; 5681da177e4SLinus Torvalds struct cmsghdr *cmsg; 5691da177e4SLinus Torvalds struct iovec iov; 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds msg.msg_name = NULL; 5721da177e4SLinus Torvalds msg.msg_namelen = 0; 5731da177e4SLinus Torvalds iov = ((struct iovec) { .iov_base = helper_pid_out, 5741da177e4SLinus Torvalds .iov_len = sizeof(*helper_pid_out) }); 5751da177e4SLinus Torvalds msg.msg_iov = &iov; 5761da177e4SLinus Torvalds msg.msg_iovlen = 1; 5771da177e4SLinus Torvalds msg.msg_control = buf; 5781da177e4SLinus Torvalds msg.msg_controllen = sizeof(buf); 5791da177e4SLinus Torvalds msg.msg_flags = 0; 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds n = recvmsg(fd, &msg, 0); 5821da177e4SLinus Torvalds if(n < 0) 583108ffa8cSJeff Dike return -errno; 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds else if(n != sizeof(iov.iov_len)) 5861da177e4SLinus Torvalds *helper_pid_out = -1; 5871da177e4SLinus Torvalds 5881da177e4SLinus Torvalds cmsg = CMSG_FIRSTHDR(&msg); 5891da177e4SLinus Torvalds if(cmsg == NULL){ 5901da177e4SLinus Torvalds printk("rcv_fd didn't receive anything, error = %d\n", errno); 591108ffa8cSJeff Dike return -1; 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds if((cmsg->cmsg_level != SOL_SOCKET) || 5941da177e4SLinus Torvalds (cmsg->cmsg_type != SCM_RIGHTS)){ 5951da177e4SLinus Torvalds printk("rcv_fd didn't receive a descriptor\n"); 596108ffa8cSJeff Dike return -1; 5971da177e4SLinus Torvalds } 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds new = ((int *) CMSG_DATA(cmsg))[0]; 600108ffa8cSJeff Dike return new; 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds int os_create_unix_socket(char *file, int len, int close_on_exec) 6041da177e4SLinus Torvalds { 6051da177e4SLinus Torvalds struct sockaddr_un addr; 6061da177e4SLinus Torvalds int sock, err; 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds sock = socket(PF_UNIX, SOCK_DGRAM, 0); 609b4fd310eSJeff Dike if(sock < 0) 610b4fd310eSJeff Dike return -errno; 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds if(close_on_exec) { 6131da177e4SLinus Torvalds err = os_set_exec_close(sock, 1); 6141da177e4SLinus Torvalds if(err < 0) 6151da177e4SLinus Torvalds printk("create_unix_socket : close_on_exec failed, " 6161da177e4SLinus Torvalds "err = %d", -err); 6171da177e4SLinus Torvalds } 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds addr.sun_family = AF_UNIX; 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds /* XXX Be more careful about overflow */ 6221da177e4SLinus Torvalds snprintf(addr.sun_path, len, "%s", file); 6231da177e4SLinus Torvalds 6241da177e4SLinus Torvalds err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); 625b4fd310eSJeff Dike if(err < 0) 626b4fd310eSJeff Dike return -errno; 6271da177e4SLinus Torvalds 628108ffa8cSJeff Dike return sock; 6291da177e4SLinus Torvalds } 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds void os_flush_stdout(void) 6321da177e4SLinus Torvalds { 6331da177e4SLinus Torvalds fflush(stdout); 6341da177e4SLinus Torvalds } 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds int os_lock_file(int fd, int excl) 6371da177e4SLinus Torvalds { 6381da177e4SLinus Torvalds int type = excl ? F_WRLCK : F_RDLCK; 6391da177e4SLinus Torvalds struct flock lock = ((struct flock) { .l_type = type, 6401da177e4SLinus Torvalds .l_whence = SEEK_SET, 6411da177e4SLinus Torvalds .l_start = 0, 6421da177e4SLinus Torvalds .l_len = 0 } ); 6431da177e4SLinus Torvalds int err, save; 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds err = fcntl(fd, F_SETLK, &lock); 6461da177e4SLinus Torvalds if(!err) 6471da177e4SLinus Torvalds goto out; 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds save = -errno; 6501da177e4SLinus Torvalds err = fcntl(fd, F_GETLK, &lock); 6511da177e4SLinus Torvalds if(err){ 6521da177e4SLinus Torvalds err = -errno; 6531da177e4SLinus Torvalds goto out; 6541da177e4SLinus Torvalds } 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid); 6571da177e4SLinus Torvalds err = save; 6581da177e4SLinus Torvalds out: 659108ffa8cSJeff Dike return err; 6601da177e4SLinus Torvalds } 661