Merges the elements of the given enumerable object to the set and returns self.
Converts arg to an Integer. Numeric types are converted directly (with floating point numbers being truncated). base (0, or between 2 and 36) is a base for integer string representation. If arg is a String, when base is omitted or equals zero, radix indicators (0, 0b, and 0x) are honored. In any case, strings should be strictly conformed to numeric representation. This behavior is different from that of String#to_i. Non string values will be converted by first trying to_int, then to_i. Passing nil raises a TypeError.
Integer(123.999) #=> 123 Integer("0x1a") #=> 26 Integer(Time.new) #=> 1204973019 Integer("0930", 10) #=> 930 Integer("111", 2) #=> 7 Integer(nil) #=> TypeError
Computes the natural logarithm of decimal to the specified number of digits of precision, numeric.
If decimal is zero or negative, raises Math::DomainError.
If decimal is positive infinity, returns Infinity.
If decimal is NaN, returns NaN.
Generate a JSON document from the Ruby data structure obj and return it. state is * a JSON::State object,
or a Hash like object (responding to to_hash),
an object convertible into a hash by a to_h method,
that is used as or to configure a State object.
It defaults to a state object, that creates the shortest possible JSON text in one line, checks for circular data structures and doesn’t allow NaN, Infinity, and -Infinity.
A state hash can have the following keys:
indent: a string used to indent levels (default: ”),
space: a string that is put after, a : or , delimiter (default: ”),
space_before: a string that is put before a : pair delimiter (default: ”),
object_nl: a string that is put at the end of a JSON object (default: ”),
array_nl: a string that is put at the end of a JSON array (default: ”),
allow_nan: true if NaN, Infinity, and -Infinity should be generated, otherwise an exception is thrown if these values are encountered. This options defaults to false.
max_nesting: The maximum depth of nesting allowed in the data structures from which JSON is to be generated. Disable depth checking with :max_nesting => false, it defaults to 100.
See also the fast_generate for the fastest creation method with the least amount of sanity checks, and the pretty_generate method for some defaults for pretty output.
Log a message with the specified priority. Example:
Syslog.log(Syslog::LOG_CRIT, "Out of disk space") Syslog.log(Syslog::LOG_CRIT, "User %s logged in", ENV['USER'])
The priority levels, in descending order, are:
System is unusable
Action needs to be taken immediately
A critical condition has occurred
An error occurred
Warning of a possible problem
A normal but significant condition occurred
Informational message
Debugging information
Each priority level also has a shortcut method that logs with it’s named priority. As an example, the two following statements would produce the same result:
Syslog.log(Syslog::LOG_ALERT, "Out of memory") Syslog.alert("Out of memory")
Format strings are as for printf/sprintf, except that in addition %m is replaced with the error message string that would be returned by strerror(errno).
Returns the natural logarithm of Complex. If a second argument is given, it will be the base of logarithm.
CMath.log(1 + 4i) #=> (1.416606672028108+1.3258176636680326i) CMath.log(1 + 4i, 10) #=> (0.6152244606891369+0.5757952953408879i)
Returns the natural logarithm of Complex. If a second argument is given, it will be the base of logarithm.
CMath.log(1 + 4i) #=> (1.416606672028108+1.3258176636680326i) CMath.log(1 + 4i, 10) #=> (0.6152244606891369+0.5757952953408879i)
Returns the logarithm of x. If additional second argument is given, it will be the base of logarithm. Otherwise it is e (for the natural logarithm).
Domain: (0, INFINITY)
Codomain: (-INFINITY, INFINITY)
Math.log(0) #=> -Infinity Math.log(1) #=> 0.0 Math.log(Math::E) #=> 1.0 Math.log(Math::E**3) #=> 3.0 Math.log(12, 3) #=> 2.2618595071429146
Returns the base 2 logarithm of x.
Domain: (0, INFINITY)
Codomain: (-INFINITY, INFINITY)
Math.log2(1) #=> 0.0 Math.log2(2) #=> 1.0 Math.log2(32768) #=> 15.0 Math.log2(65536) #=> 16.0
Returns the base 10 logarithm of x.
Domain: (0, INFINITY)
Codomain: (-INFINITY, INFINITY)
Math.log10(1) #=> 0.0 Math.log10(10) #=> 1.0 Math.log10(10**100) #=> 100.0
creates a TCP/IP server on port and calls the block for each connection accepted. The block is called with a socket and a client_address as an Addrinfo object.
If host is specified, it is used with port to determine the server addresses.
The socket is not closed when the block returns. So application should close it explicitly.
This method calls the block sequentially. It means that the next connection is not accepted until the block returns. So concurrent mechanism, thread for example, should be used to service multiple clients at a time.
Note that Addrinfo.getaddrinfo is used to determine the server socket addresses. When Addrinfo.getaddrinfo returns two or more addresses, IPv4 and IPv6 address for example, all of them are used. Socket.tcp_server_loop succeeds if one socket can be used at least.
# Sequential echo server. # It services only one client at a time. Socket.tcp_server_loop(16807) {|sock, client_addrinfo| begin IO.copy_stream(sock, sock) ensure sock.close end } # Threaded echo server # It services multiple clients at a time. # Note that it may accept connections too much. Socket.tcp_server_loop(16807) {|sock, client_addrinfo| Thread.new { begin IO.copy_stream(sock, sock) ensure sock.close end } }
creates a UDP/IP server on port and calls the block for each message arrived. The block is called with the message and its source information.
This method allocates sockets internally using port. If host is specified, it is used conjunction with port to determine the server addresses.
The msg is a string.
The msg_src is a Socket::UDPSource object. It is used for reply.
# UDP/IP echo server. Socket.udp_server_loop(9261) {|msg, msg_src| msg_src.reply msg }
creates a UNIX socket server on path. It calls the block for each socket accepted.
If host is specified, it is used with port to determine the server ports.
The socket is not closed when the block returns. So application should close it.
This method deletes the socket file pointed by path at first if the file is a socket file and it is owned by the user of the application. This is safe only if the directory of path is not changed by a malicious user. So don’t use /tmp/malicious-users-directory/socket. Note that /tmp/socket and /tmp/your-private-directory/socket is safe assuming that /tmp has sticky bit.
# Sequential echo server. # It services only one client at a time. Socket.unix_server_loop("/tmp/sock") {|sock, client_addrinfo| begin IO.copy_stream(sock, sock) ensure sock.close end }
Finds the appropriate virtual host to handle req
Is code a server error status?
Is code a server error status?
Run UDP/IP server loop on the given sockets.
The return value of Socket.udp_server_sockets is appropriate for the argument.
It calls the block for each message received.
Creates a new Socket::Option object for SOL_SOCKET/SO_LINGER.
onoff should be an integer or a boolean.
secs should be the number of seconds.
p Socket::Option.linger(true, 10) #=> #<Socket::Option: UNSPEC SOCKET LINGER on 10sec>
Returns the linger data in sockopt as a pair of boolean and integer.
sockopt = Socket::Option.linger(true, 10) p sockopt.linger => [true, 10]
Logs in to the remote host. The session must have been previously connected. If user is the string “anonymous” and the password is nil, “anonymous@” is used as a password. If the acct parameter is not nil, an FTP ACCT command is sent following the successful login. Raises an exception on error (typically Net::FTPPermError).