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 <fcntl.h> 23 #include <stdlib.h> 24 #include <termios.h> 25 #include <unistd.h> 26 #include <time.h> 27 #include <errno.h> 28 #include <sys/types.h> 29 #include <sys/stat.h> 30 #include <sys/mman.h> 31 #include <linux/types.h> 32 33 #include <os.h> 34 35 /* Operating System Interface */ 36 37 ssize_t os_read(int fd, void *buf, size_t count) 38 { 39 return read(fd, buf, count); 40 } 41 42 ssize_t os_write(int fd, const void *buf, size_t count) 43 { 44 return write(fd, buf, count); 45 } 46 47 int os_open(const char *pathname, int flags) 48 { 49 return open(pathname, flags); 50 } 51 52 int os_close(int fd) 53 { 54 return close(fd); 55 } 56 57 void os_exit(int exit_code) 58 { 59 exit(exit_code); 60 } 61 62 /* Restore tty state when we exit */ 63 static struct termios orig_term; 64 65 static void os_fd_restore(void) 66 { 67 tcsetattr(0, TCSANOW, &orig_term); 68 } 69 70 /* Put tty into raw mode so <tab> and <ctrl+c> work */ 71 void os_tty_raw(int fd) 72 { 73 static int setup = 0; 74 struct termios term; 75 76 if (setup) 77 return; 78 setup = 1; 79 80 /* If not a tty, don't complain */ 81 if (tcgetattr(fd, &orig_term)) 82 return; 83 84 term = orig_term; 85 term.c_iflag = IGNBRK | IGNPAR; 86 term.c_oflag = OPOST | ONLCR; 87 term.c_cflag = CS8 | CREAD | CLOCAL; 88 term.c_lflag = 0; 89 if (tcsetattr(fd, TCSANOW, &term)) 90 return; 91 92 atexit(os_fd_restore); 93 } 94 95 void *os_malloc(size_t length) 96 { 97 return mmap(NULL, length, PROT_READ | PROT_WRITE, 98 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 99 } 100 101 void os_usleep(unsigned long usec) 102 { 103 usleep(usec); 104 } 105 106 u64 os_get_nsec(void) 107 { 108 #if defined(CLOCK_MONOTONIC) && defined(_POSIX_MONOTONIC_CLOCK) 109 struct timespec tp; 110 if (EINVAL == clock_gettime(CLOCK_MONOTONIC, &tp)) { 111 struct timeval tv; 112 113 gettimeofday(&tv, NULL); 114 tp.tv_sec = tv.tv_sec; 115 tp.tv_nsec = tv.tv_usec * 1000; 116 } 117 return tp.tv_sec * 1000000000ULL + tp.tv_nsec; 118 #else 119 struct timeval tv; 120 gettimeofday(&tv, NULL); 121 return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000; 122 #endif 123 } 124