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 os_flags) 62 { 63 int flags; 64 65 switch (os_flags & OS_O_MASK) { 66 case OS_O_RDONLY: 67 default: 68 flags = O_RDONLY; 69 break; 70 71 case OS_O_WRONLY: 72 flags = O_WRONLY; 73 break; 74 75 case OS_O_RDWR: 76 flags = O_RDWR; 77 break; 78 } 79 80 if (os_flags & OS_O_CREAT) 81 flags |= O_CREAT; 82 83 return open(pathname, flags, 0777); 84 } 85 86 int os_close(int fd) 87 { 88 return close(fd); 89 } 90 91 void os_exit(int exit_code) 92 { 93 exit(exit_code); 94 } 95 96 /* Restore tty state when we exit */ 97 static struct termios orig_term; 98 99 static void os_fd_restore(void) 100 { 101 tcsetattr(0, TCSANOW, &orig_term); 102 } 103 104 /* Put tty into raw mode so <tab> and <ctrl+c> work */ 105 void os_tty_raw(int fd) 106 { 107 static int setup = 0; 108 struct termios term; 109 110 if (setup) 111 return; 112 setup = 1; 113 114 /* If not a tty, don't complain */ 115 if (tcgetattr(fd, &orig_term)) 116 return; 117 118 term = orig_term; 119 term.c_iflag = IGNBRK | IGNPAR; 120 term.c_oflag = OPOST | ONLCR; 121 term.c_cflag = CS8 | CREAD | CLOCAL; 122 term.c_lflag = 0; 123 if (tcsetattr(fd, TCSANOW, &term)) 124 return; 125 126 atexit(os_fd_restore); 127 } 128 129 void *os_malloc(size_t length) 130 { 131 return mmap(NULL, length, PROT_READ | PROT_WRITE, 132 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 133 } 134 135 void os_usleep(unsigned long usec) 136 { 137 usleep(usec); 138 } 139 140 u64 os_get_nsec(void) 141 { 142 #if defined(CLOCK_MONOTONIC) && defined(_POSIX_MONOTONIC_CLOCK) 143 struct timespec tp; 144 if (EINVAL == clock_gettime(CLOCK_MONOTONIC, &tp)) { 145 struct timeval tv; 146 147 gettimeofday(&tv, NULL); 148 tp.tv_sec = tv.tv_sec; 149 tp.tv_nsec = tv.tv_usec * 1000; 150 } 151 return tp.tv_sec * 1000000000ULL + tp.tv_nsec; 152 #else 153 struct timeval tv; 154 gettimeofday(&tv, NULL); 155 return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000; 156 #endif 157 } 158