
exit(3)  cause normal program termination

The exit() function causes normal program termination and the value of status is returned to the parent. All functions registered with atexit() and on_exit() are called in the reverse order of their r... 
exp(3)  exponential, logarithmic and power functions

The exp() function returns the value of e (the base of natural logarithms) raised to the power of x. The log() function returns the natural logarithm of x. The log10() function returns the base10 log... 

expm1(3)  exponential minus 1, logarithm of 1 plus argument

expm1(x) returns a value equivalent to `exp (x)  1'. It is computed in a way that is accurate even if the value of x is near zeroa case where `exp (x)  1' would be inaccurate due to subtraction ... 
fabs(3)  absolute value of floatingpoint number

The fabs functions return the absolute value of the floatingpoint number x. 
fclose(3)  close a stream

The fclose function dissociates the named stream from its underlying file or set of functions. If the stream was being used for output, any buffered data is written first, using fflush(3). 
fcloseall(3)  close all open streams

The fcloseall function dissociates all open streams from its underlying file or set of functions. Any buffered output data is written first, using fflush(3). Note that the standard streams (stdin, std... 
fenv(3)  C99 floating point rounding and exception handling

These eleven functions were defined in C99, and describe the handling of floating point rounding and exceptions (overflow, zerodivide etc.). Exceptions [Toc] [Back] The DivideByZero exception o... 
ferror(3)  check and reset stream status

The function clearerr clears the endoffile and error indicators for the stream pointed to by stream. The function feof tests the endoffile indicator for the stream pointed to by stream, returning ... 
fflush(3)  flush a stream

The function fflush forces a write of all userspace buffered data for the given output or update stream via the stream's underlying write function. The open status of the stream is unaffected. If th... 
ffs(3)  find first bit set in a word

The ffs() function returns the position of the first bit set in the word i. The least significant bit is position 1 and the most significant position 32. 
fgetgrent(3)  get group file entry

The fgetgrent() function returns a pointer to a structure containing the group information from the file stream. The first time it is called it returns the first entry; thereafter, it returns successi... 
fgetpwent(3)  get password file entry

The fgetpwent() function returns a pointer to a structure containing the broken out fields of a line in the file stream. The first time it is called it returns the first entry; thereafter, it returns ... 
fgetwc(3)  read a wide character from a FILE stream

The fgetwc function is the widecharacter equivalent of the fgetc function. It reads a wide character from stream and returns it. If the end of stream is reached, or if ferror(stream) becomes true, it... 
fgetws(3)  read a wide character string from a FILE stream

The fgetws function is the widecharacter equivalent of the fgets function. It reads a string of at most n1 wide characters into the widecharacter array pointed to by ws, and adds a terminating L'\... 
floor(3)  largest integral value not greater than argument

These functions round x down to the nearest integer. 