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7a9219c1 SG |
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 | ||
e1012472 | 22 | #include <errno.h> |
7a9219c1 SG |
23 | #include <fcntl.h> |
24 | #include <stdlib.h> | |
ab06a758 | 25 | #include <termios.h> |
d99a6874 | 26 | #include <time.h> |
e1012472 | 27 | #include <unistd.h> |
21899b10 | 28 | #include <sys/mman.h> |
e1012472 | 29 | #include <sys/stat.h> |
3bdf56b7 | 30 | #include <sys/time.h> |
e1012472 | 31 | #include <sys/types.h> |
d99a6874 | 32 | #include <linux/types.h> |
7a9219c1 SG |
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 | ||
e2dcefcb MF |
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 | ||
7a9219c1 SG |
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 | } | |
ab06a758 MF |
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 | } | |
21899b10 MW |
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 | } | |
d99a6874 MW |
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 | } |