robert.swiecki | 3bb518c | 2010-10-14 00:48:24 +0000 | [diff] [blame^] | 1 | /* |
| 2 | |
| 3 | honggfuzz - utilities |
| 4 | ----------------------------------------- |
| 5 | |
| 6 | Author: Robert Swiecki <swiecki@google.com> |
| 7 | |
| 8 | Copyright 2010 by Google Inc. All Rights Reserved. |
| 9 | |
| 10 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 11 | you may not use this file except in compliance with the License. |
| 12 | You may obtain a copy of the License at |
| 13 | |
| 14 | http://www.apache.org/licenses/LICENSE-2.0 |
| 15 | |
| 16 | Unless required by applicable law or agreed to in writing, software |
| 17 | distributed under the License is distributed on an "AS IS" BASIS, |
| 18 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 19 | See the License for the specific language governing permissions and |
| 20 | limitations under the License. |
| 21 | |
| 22 | */ |
| 23 | |
| 24 | #include <sys/types.h> |
| 25 | #include <sys/stat.h> |
| 26 | #include <fcntl.h> |
| 27 | #include <sys/time.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <unistd.h> |
| 30 | #include <stdint.h> |
| 31 | #include <math.h> |
| 32 | #include <time.h> |
| 33 | |
| 34 | #include "common.h" |
| 35 | #include "log.h" |
| 36 | |
| 37 | void util_rndInit(void |
| 38 | ) |
| 39 | { |
| 40 | struct timeval tv; |
| 41 | |
| 42 | gettimeofday(&tv, NULL); |
| 43 | uint64_t seed = (uint64_t) tv.tv_sec ^ ((uint64_t) tv.tv_usec << 16); |
| 44 | |
| 45 | LOGMSG(l_DEBUG, "srand48() reinitialized with %ld", (long)seed); |
| 46 | srand48((long)seed); |
| 47 | } |
| 48 | |
| 49 | /* |
| 50 | * Yeah.. the distribution is not perfect, but it's not supposed to be |
| 51 | * cryptographically secure |
| 52 | */ |
| 53 | uint32_t util_rndGet(uint32_t min, uint32_t max) |
| 54 | { |
| 55 | double rnd = drand48(); |
| 56 | |
| 57 | return (uint32_t) lrint(floor((rnd * (max - min + 1)) + min)); |
| 58 | } |
| 59 | |
| 60 | void util_getLocalTime(const char *fmt, char *buf, size_t len) |
| 61 | { |
| 62 | struct tm ltime; |
| 63 | |
| 64 | time_t t = time(NULL); |
| 65 | |
| 66 | localtime_r(&t, <ime); |
| 67 | strftime(buf, len, fmt, <ime); |
| 68 | } |
| 69 | |
| 70 | void util_nullifyStdio(void |
| 71 | ) |
| 72 | { |
| 73 | int fd = open("/dev/null", O_RDWR); |
| 74 | |
| 75 | if (fd == -1) { |
| 76 | LOGMSG_P(l_ERROR, "Couldn't open '/dev/null'"); |
| 77 | return; |
| 78 | } |
| 79 | |
| 80 | dup2(fd, 0); |
| 81 | dup2(fd, 1); |
| 82 | dup2(fd, 2); |
| 83 | |
| 84 | if (fd > 2) { |
| 85 | close(fd); |
| 86 | } |
| 87 | |
| 88 | return; |
| 89 | } |
| 90 | |
| 91 | bool util_redirectStdin(char *inputFile) |
| 92 | { |
| 93 | int fd = open(inputFile, O_RDONLY); |
| 94 | |
| 95 | if (fd == -1) { |
| 96 | LOGMSG_P(l_ERROR, "Couldn't open '%s'", inputFile); |
| 97 | return false; |
| 98 | } |
| 99 | |
| 100 | dup2(fd, 0); |
| 101 | if (fd != 0) { |
| 102 | close(fd); |
| 103 | } |
| 104 | |
| 105 | return true; |
| 106 | } |
| 107 | |
| 108 | void util_recoverStdio(void |
| 109 | ) |
| 110 | { |
| 111 | int fd = open("/dev/tty", O_RDWR); |
| 112 | |
| 113 | if (fd == -1) { |
| 114 | LOGMSG_P(l_ERROR, "Couldn't open '/dev/tty'"); |
| 115 | return; |
| 116 | } |
| 117 | |
| 118 | dup2(fd, 0); |
| 119 | dup2(fd, 1); |
| 120 | dup2(fd, 2); |
| 121 | |
| 122 | if (fd > 2) { |
| 123 | close(fd); |
| 124 | } |
| 125 | |
| 126 | return; |
| 127 | } |