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 int os_open(const char *pathname, int flags) 49 { 50 return open(pathname, flags); 51 } 52 53 int os_close(int fd) 54 { 55 return close(fd); 56 } 57 58 void os_exit(int exit_code) 59 { 60 exit(exit_code); 61 } 62 63 /* Restore tty state when we exit */ 64 static struct termios orig_term; 65 66 static void os_fd_restore(void) 67 { 68 tcsetattr(0, TCSANOW, &orig_term); 69 } 70 71 /* Put tty into raw mode so <tab> and <ctrl+c> work */ 72 void os_tty_raw(int fd) 73 { 74 static int setup = 0; 75 struct termios term; 76 77 if (setup) 78 return; 79 setup = 1; 80 81 /* If not a tty, don't complain */ 82 if (tcgetattr(fd, &orig_term)) 83 return; 84 85 term = orig_term; 86 term.c_iflag = IGNBRK | IGNPAR; 87 term.c_oflag = OPOST | ONLCR; 88 term.c_cflag = CS8 | CREAD | CLOCAL; 89 term.c_lflag = 0; 90 if (tcsetattr(fd, TCSANOW, &term)) 91 return; 92 93 atexit(os_fd_restore); 94 } 95 96 void *os_malloc(size_t length) 97 { 98 return mmap(NULL, length, PROT_READ | PROT_WRITE, 99 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 100 } 101 102 void os_usleep(unsigned long usec) 103 { 104 usleep(usec); 105 } 106 107 u64 os_get_nsec(void) 108 { 109 #if defined(CLOCK_MONOTONIC) && defined(_POSIX_MONOTONIC_CLOCK) 110 struct timespec tp; 111 if (EINVAL == clock_gettime(CLOCK_MONOTONIC, &tp)) { 112 struct timeval tv; 113 114 gettimeofday(&tv, NULL); 115 tp.tv_sec = tv.tv_sec; 116 tp.tv_nsec = tv.tv_usec * 1000; 117 } 118 return tp.tv_sec * 1000000000ULL + tp.tv_nsec; 119 #else 120 struct timeval tv; 121 gettimeofday(&tv, NULL); 122 return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000; 123 #endif 124 } 125