1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * See file CREDITS for list of people who contributed to this 4 * project. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 19 * MA 02111-1307 USA 20 */ 21 22 #include <errno.h> 23 #include <fcntl.h> 24 #include <stdlib.h> 25 #include <termios.h> 26 #include <time.h> 27 #include <unistd.h> 28 #include <sys/mman.h> 29 #include <sys/stat.h> 30 #include <sys/time.h> 31 #include <sys/types.h> 32 #include <linux/types.h> 33 34 #include <os.h> 35 36 /* Operating System Interface */ 37 38 ssize_t os_read(int fd, void *buf, size_t count) 39 { 40 return read(fd, buf, count); 41 } 42 43 ssize_t os_write(int fd, const void *buf, size_t count) 44 { 45 return write(fd, buf, count); 46 } 47 48 off_t os_lseek(int fd, off_t offset, int whence) 49 { 50 if (whence == OS_SEEK_SET) 51 whence = SEEK_SET; 52 else if (whence == OS_SEEK_CUR) 53 whence = SEEK_CUR; 54 else if (whence == OS_SEEK_END) 55 whence = SEEK_END; 56 else 57 os_exit(1); 58 return lseek(fd, offset, whence); 59 } 60 61 int os_open(const char *pathname, int flags) 62 { 63 return open(pathname, flags); 64 } 65 66 int os_close(int fd) 67 { 68 return close(fd); 69 } 70 71 void os_exit(int exit_code) 72 { 73 exit(exit_code); 74 } 75 76 /* Restore tty state when we exit */ 77 static struct termios orig_term; 78 79 static void os_fd_restore(void) 80 { 81 tcsetattr(0, TCSANOW, &orig_term); 82 } 83 84 /* Put tty into raw mode so <tab> and <ctrl+c> work */ 85 void os_tty_raw(int fd) 86 { 87 static int setup = 0; 88 struct termios term; 89 90 if (setup) 91 return; 92 setup = 1; 93 94 /* If not a tty, don't complain */ 95 if (tcgetattr(fd, &orig_term)) 96 return; 97 98 term = orig_term; 99 term.c_iflag = IGNBRK | IGNPAR; 100 term.c_oflag = OPOST | ONLCR; 101 term.c_cflag = CS8 | CREAD | CLOCAL; 102 term.c_lflag = 0; 103 if (tcsetattr(fd, TCSANOW, &term)) 104 return; 105 106 atexit(os_fd_restore); 107 } 108 109 void *os_malloc(size_t length) 110 { 111 return mmap(NULL, length, PROT_READ | PROT_WRITE, 112 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 113 } 114 115 void os_usleep(unsigned long usec) 116 { 117 usleep(usec); 118 } 119 120 u64 os_get_nsec(void) 121 { 122 #if defined(CLOCK_MONOTONIC) && defined(_POSIX_MONOTONIC_CLOCK) 123 struct timespec tp; 124 if (EINVAL == clock_gettime(CLOCK_MONOTONIC, &tp)) { 125 struct timeval tv; 126 127 gettimeofday(&tv, NULL); 128 tp.tv_sec = tv.tv_sec; 129 tp.tv_nsec = tv.tv_usec * 1000; 130 } 131 return tp.tv_sec * 1000000000ULL + tp.tv_nsec; 132 #else 133 struct timeval tv; 134 gettimeofday(&tv, NULL); 135 return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000; 136 #endif 137 } 138