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 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...
 ctermid(3) -- get controlling terminal name
    ctermid() returns a string which is the pathname for the current controlling terminal for this process. If s is NULL, a static buffer is used, otherwise s points to a buffer used to hold the terminal ...
 ctime(3) -- transform binary date and time to ASCII
    The ctime(), gmtime() and localtime() functions all take an argument of data type time_t which represents calendar time. When interpreted as an absolute time value, it represents the number of seconds...
 cutbuffer(3) -- Manipulate X cut buffer properties
    The cutbuffer command allows you to read or modify the eight X cut buffer properties. You can also rotate the buffers properties.
 daemon(3) -- run in the background
    The daemon() function is for programs wishing to detach themselves from the controlling terminal and run in the background as system daemons. Unless the argument nochdir is non-zero, daemon() changes ...
 dbopen(3) -- database access methods
    Dbopen is the library interface to database files. The supported file formats are btree, hashed and UNIX file oriented. The btree format is a representation of a sorted, balanced tree structure. The h...
 dcgettext(3) --
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