C

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• cabs(), cabsf()

  Compute the absolute value of a complex number

• calloc()

  Allocate space for an array

• cbrt(), cbrtf()

  Compute the cube root of a number

• ceil(), ceilf()

  Round up a value to the next integer

• cfgetispeed()

  Return the input baud rate that's stored in a termios structure

• cfgetospeed()

  Return the output baud rate that's stored in a termios structure

• cfgopen()

  Open a configuration file

• cfmakeraw()

  Set terminal attributes

• cfree()

  Free allocated memory

• cfsetispeed()

  Set the input baud rate in a termios structure

• cfsetospeed()

  Set the output baud rate in a termios structure

• ChannelCreate(), ChannelCreate_r()

  Create a communications channel

• ChannelDestroy(), ChannelDestroy_r()

  Destroy a communications channel

• chdir()

  Change the current working directory

• chmod()

  Change the permissions for a file

• chown()

  Change the user ID and group ID of a file

• chroot()

  Change the root directory

• chsize()

  Change the size of a file

• clearenv()

  Clear the environment

• clearerr()

  Clear a stream's end-of-file and error flags

• clock()

  Return the number of clock ticks used by the program

• clock_getcpuclockid()

  Return the clock ID of the CPU-time clock from a specified process

• clock_getres()

  Get the resolution of the clock

• clock_gettime()

  Get the current time of a clock

• clock_nanosleep()

  High resolution sleep with specifiable clock

• clock_settime()

  Set a clock

• ClockAdjust(), ClockAdjust_r()

  Adjust the time of a clock

• ClockCycles()

  Get the number of clock cycles

• ClockId(), ClockId_r()

  Get a clock ID for a given process and thread

• ClockPeriod(), ClockPeriod_r()

  Get or set a clock period

• ClockTime(), ClockTime_r()

  Get or set a clock

• close()

  Close a file

• closedir()

  Close a directory

• _cmdfd()

  Return a file descriptor for the executable file

• _cmdname()

  Find the path used to invoke the current process

• confstr()

  Get configuration-defined string values

• connect()

  Initiate a connection on a socket

• ConnectAttach(), ConnectAttach_r()

  Establish a connection between a process and a channel

• ConnectClientInfo(), ConnectClientInfo_r()

  Store information about a client connection

• ConnectDetach(), ConnectDetach_r()

  Break a connection between a process and a channel

• ConnectFlags(), ConnectFlags_r()

  Modify the flags associated with a connection

• ConnectServerInfo(), ConnectServerInfo_r()

  Get information about a server connection

• copysign(), copysignf()

  Copy the sign bit from one number to another

• cos(), cosf(), cosl()

  Compute the cosine of an angle

• cosh(), coshf(), coshl()

  Compute the hyperbolic cosine

• creat(), creat64()

  Create and open a file (low-level)

• crypt()

  Encrypt a password

• ctermid()

  Generate the path name of the current controlling terminal

• ctime(), ctime_r()

  Convert calendar time to local time