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 busy(3) -- Make Tk widgets busy, temporarily blocking user interactions.
    The busy command provides a simple means to block keyboard, button, and pointer events from Tk widgets, while overriding the widget's cursor with a configurable busy cursor.
 byteorder(3) -- convert values between host and network byte order
    The htonl() function converts the long integer hostlong from host byte order to network byte order. The htons() function converts the short integer hostshort from host byte order to network byte order...
 bzero(3) -- write zeros to a byte string
    The bzero() function sets the first n bytes of the byte string s to zero.
 catgets(3) -- get message from a message catalog
    catgets() reads the message message_number, in set set_number, from the message catalog identified by catalog, where catalog is a catalog descriptor returned from an earlier call to catopen(3). The fo...
 catopen(3) -- open/close a message catalog
    catopen() opens a message catalog and returns a catalog descriptor. name specifies the name of the message catalog to be opened. If name specifies and absolute path, (i.e. contains a `/') then name s...
 cbrt(3) -- cube root function
    The cbrt() function returns the cube root of x. This function cannot fail; every representable real value has a representable real cube root.
 ceil(3) -- ceiling function: smallest integral value not less than argument
    These functions round x up to the nearest integer.
 clock(3) -- Determine processor time
    The clock() function returns an approximation of processor time used by the program.
 closedir(3) -- close a directory
    The closedir() function closes the directory stream associated with dir. The directory stream descriptor dir is not available after this call.
 cmsg(3) -- Access ancillary data.
    These macros are used to create and access control messages (also called ancillary data) that are not a part of the socket payload. This control information may include the interface the packet was re...
 confstr(3) -- get configuration dependent string variables
    confstr() gets the value of configuration - dependent string variables. The name argument is the system variable to be queried. The following variables are supported: _CS_PATH A value for the PATH var...
 copysign(3) -- copy sign of a number
    The copysign() function returns a value whose absolute value matches x, but whose sign matches that of y.
 cos(3) -- cosine function
    The cos() function returns the cosine of x, where x is given in radians.
 cosh(3) -- hyperbolic cosine function
    The cosh() function returns the hyperbolic cosine of x, which is defined mathematically as (exp(x) + exp(-x)) / 2.
 crypt(3) -- password and data encryption
    crypt provides acess to two algorithms for password encryption. One it's based on the Data Encryption Standard algorithm with variations intended (among other things) to discourage use of hardware im...
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