2 * This file is part of PowerDNS or dnsdist.
3 * Copyright -- PowerDNS.COM B.V. and its contributors
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * In addition, for the avoidance of any doubt, permission is granted to
10 * link this program with OpenSSL and to (re)distribute the binaries
11 * produced as the result of such linking.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 // Utility class specification.
25 #ifdef NEED_POSIX_TYPEDEF
26 typedef unsigned char uint8_t;
27 typedef unsigned short int uint16_t;
28 typedef unsigned int uint32_t;
29 typedef unsigned long long uint64_t;
32 #include <arpa/inet.h>
33 #include <netinet/in.h>
34 #include <sys/socket.h>
39 #include <semaphore.h>
45 #include "namespaces.hh"
47 //! A semaphore class.
51 typedef int sem_value_t;
53 #if defined(_AIX) || defined(__APPLE__)
55 pthread_mutex_t m_lock;
56 pthread_cond_t m_gtzero;
60 std::unique_ptr<sem_t> m_pSemaphore;
65 Semaphore(const Semaphore&) = delete;
66 void operator=(const Semaphore&) = delete;
67 //! Default constructor.
68 Semaphore( unsigned int value = 0 );
73 //! Posts to a semaphore.
76 //! Waits for a semaphore.
79 //! Tries to wait for a semaphore.
82 //! Retrieves the semaphore value.
83 int getValue( Semaphore::sem_value_t *sval );
86 //! This is a utility class used for platform independent abstraction.
90 typedef ::iovec iovec;
91 typedef ::pid_t pid_t;
93 typedef ::socklen_t socklen_t;
95 //! Connect with timeout
100 static int timed_connect(sock_t sock,
101 const sockaddr *addr,
102 socklen_t sockaddr_size,
106 //! Returns the process id of the current process.
107 static pid_t getpid();
109 //! Gets the current time.
110 static int gettimeofday( struct timeval *tv, void *tz = NULL );
112 //! Converts an address from dot and numbers format to binary data.
113 static int inet_aton( const char *cp, struct in_addr *inp );
115 //! Converts an address from presentation format to network format.
116 static int inet_pton( int af, const char *src, void *dst );
118 //! The inet_ntop() function converts an address from network format (usually a struct in_addr or some other binary form, in network byte order) to presentation format.
119 static const char *inet_ntop( int af, const char *src, char *dst, size_t size );
122 static int writev( Utility::sock_t socket, const iovec *vector, size_t count );
124 //! Drops the program's group privileges.
125 static void dropGroupPrivs( uid_t uid, gid_t gid );
127 //! Drops the program's user privileges.
128 static void dropUserPrivs( uid_t uid );
130 //! Sets the socket into Bind-any mode
131 static void setBindAny ( int af, Utility::sock_t socket );
133 //! Sleeps for a number of seconds.
134 static unsigned int sleep( unsigned int seconds );
136 //! Sleeps for a number of microseconds.
137 static void usleep( unsigned long usec );
139 static time_t timegm(struct tm *tm);