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| fabs Subroutine | Computes the floating-point absolute value. |
| fabsl Subroutine | Computes the floating-point absolute value. |
| faccessx Subroutine | Determines the accessibility of a file. |
| fattach Subroutine | Attaches a STREAMS-based file descriptor to a file. |
| fchacl Subroutine | Changes the permissions on a file. |
| fchdir Subroutine | Directory pointed to by the file descriptor becomes the current working directory. |
| fchmod Subroutine | Changes file access permissions. |
| fchown Subroutine | Changes file ownership. |
| fchownx Subroutine | Changes file ownership. |
| fclear Subroutine | Makes a hole in a file. |
| fclear64 Subroutine | Makes a hole in a file. |
| fclose Subroutine | Closes or flushes a stream. |
| fcntl Subroutine | Controls open file descriptors. |
| fcvt Subroutine | Converts a floating-point number to a string. |
| fdetach Subroutine | Detaches STREAMS-based file from the file to which it was attached. |
| fdopen Subroutine | Opens a stream. |
| feof Macro | Checks the status of a stream. |
| ferror Macro | Checks the status of a stream. |
| fetch_and_add Subroutine | Updates a single word variable atomically. |
| fetch_and_and Subroutine | Sets or clears bits in a single word variable atomically. |
| fetch_and_or Subroutine | Sets or clears bits in a single word variable atomically. |
| ffinfo Subroutine | Returns file information. |
| fflush Subroutine | Closes or flushes a stream. |
| ffs Subroutine | Performs bit and byte string operations. |
| ffullstat Subroutine | Provides information about a file. |
| fgetc Subroutine | Gets a character or word from an input stream. |
| fgetpos Subroutine | Repositions the file pointer of a stream. |
| fgetpos64 Subroutine | Repositions the file pointer of a stream. |
| fgets Subroutine | Gets a string from a stream. |
| fgetwc Subroutine | Gets a wide character from an input stream. |
| fgetws Subroutine | Gets a string from a stream. |
| fileno Macro | Checks the status of a stream. |
| filter Subroutine | Disables use of certain terminal capabilities. |
| finfo Subroutine | Returns file information. |
| finite Subroutine | Determines classifications of floating-point numbers. |
| flash Subroutine | Flashes the screen. |
| flock Subroutine | Locks and unlocks sections of open files. |
| flockfile Subroutine | Provides for explicit application-level locking of stdio (FILE*) objects. |
| floor Subroutine | Rounds floating-point numbers to floating-point integer values. |
| floorl Subroutine | Rounds floating-point numbers to floating-point integer values. |
| flushinp Subroutine | Discards input. |
| fmin Subroutine | Multiple-precision integer arithmetic. |
| fmod Subroutine | Computes the modulo remainder. |
| fmodl Subroutine | Computes the modulo remainder. |
| fmout Subroutine | Multiple-precision integer arithmetic. |
| fmtmsg Subroutine | Display a message in the specified format on standard error, the console, or both. |
| fnmatch Subroutine | Matches file name patterns. |
| fopen Subroutine | Opens a stream. |
| fopen64 Subroutine | Opens a stream. |
| fork Subroutine | Creates a new process. |
| fp_any_enable Subroutine | These subroutines allow operations on the floating-point trap control. |
| fp_any_xcp Subroutine | Tests to see if a floating-point exception has occurred. |
| fpathconf Subroutine | Retrieves file-implementation characteristics. |
| fp_clr_flag Subroutine | Allows operations on the floating-point exception flags. |
| fp_cpusync Subroutine | Queries or changes the floating-point exception enable (FE) bit in the Machine Status register (MSR). |
| fp_disable Subroutine | These subroutines allow operations on the floating-point trap control. |
| fp_disable_all Subroutine | These subroutines allow operations on the floating-point trap control. |
| fp_divbyzero Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_enable Subroutine | These subroutines allow operations on the floating-point trap control. |
| fp_enable_all Subroutine | These subroutines allow operations on the floating-point trap control. |
| fp_flush_imprecise Subroutine | Forces imprecise signal delivery. |
| fp_inexact Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_invalid_op Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_iop_convert Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_iop_infdinf Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_iop_infmzr Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_iop_infsinf Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_iop_invcmp Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_iop_snan Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_iop_sqrt Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_iop_vxsoft Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_iop_zrdzr Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_is_enabled Subroutine | These subroutines allow operations on the floating-point trap control. |
| fp_overflow Subroutine | Tests to see if a floating-point exception has occurred. |
| fp_raise_xcp Subroutine | Generates a floating-point exception. |
| fp_read_flag Subroutine | Allows operations on the floating-point exception flags. |
| fp_read_rnd Subroutine | Read and set the IEEE floating-point rounding mode. |
| fprintf Subroutine | Prints formatted output. |
| fp_set_flag Subroutine | Allows operations on the floating-point exception flags. |
| fp_sh_info Subroutine | From within a floating-point signal handler, determines any floating-point exception that caused the trap in the process and changes the state of the Floating-Point Status and Control register (FPSCR) in the user process. |
| fp_sh_set_stat Subroutine | From within a floating-point signal handler, determines any floating-point exception that caused the trap in the process and changes the state of the Floating-Point Status and Control register (FPSCR) in the user process. |
| fp_sh_trap_info Subroutine | From within a floating-point signal handler, determines any floating-point exception that caused the trap in the process and changes the state of the Floating-Point Status and Control register (FPSCR) in the user process. |
| fp_swap_flag Subroutine | Allows operations on the floating-point exception flags. |
| fp_swap_rnd Subroutine | Read and set the IEEE floating-point rounding mode. |
| fp_trap Subroutine | Queries or changes the mode of the user process to allow floating-point exceptions to generate traps. |
| fp_trapstate Subroutine | Queries or changes the trapping mode in the Machine Status register (MSR). |
| fp_underflow Subroutine | Tests to see if a floating-point exception has occurred. |
| fputc Subroutine | Writes a character or a word to a stream. |
| fputs Subroutine | Writes a string to a stream. |
| fputwc Subroutine | Writes a character or a word to a stream. |
| fputws Subroutine | Writes a wide-character string to a stream. |
| fread Subroutine | Reads and writes binary files. |
| free Subroutine | Provides a memory allocator. |
| freeaddrinfo Subroutine | To free memory allocated by getaddrinfo. |
| freopen Subroutine | Opens a stream. |
| freopen64 Subroutine | Opens a stream. |
| frevoke Subroutine | Revokes access to a file by other processes. |
| frexp Subroutine | Manipulates floating-point numbers. |
| frexpl Subroutine | Manipulates floating-point numbers. |
| fscanf Subroutine | Converts formatted input. |
| fscntl Subroutine | Controls file system control operations. |
| fseek Subroutine | Repositions the file pointer of a stream. |
| fseeko Subroutine | Repositions the file pointer of a stream. |
| fseeko64 Subroutine | Repositions the file pointer of a stream. |
| fsetpos Subroutine | Repositions the file pointer of a stream. |
| fsetpos64 Subroutine | Repositions the file pointer of a stream. |
| fstat Subroutine | Provides information about a file. |
| fstat64 Subroutine | Provides information about a file. |
| fstatacl Subroutine | Retrieves the access control information for a file. |
| fstatfs Subroutine | Gets file system statistics. |
| fstatvfs Subroutine | Returns information about a file system. |
| fstatx Subroutine | Provides information about a file. |
| fsync Subroutine | Writes changes in a file to permanent storage. |
| ftell Subroutine | Repositions the file pointer of a stream. |
| ftello Subroutine | Repositions the file pointer of a stream. |
| ftello64 Subroutine | Repositions the file pointer of a stream. |
| ftime Subroutine | Displays, gets and sets date and time. |
| ftok Subroutine | Generates a standard interprocess communication key. |
| ftruncate Subroutine | Changes the length of regular files. |
| ftruncate64 Subroutine | Changes the length of regular files. |
| ftrylockfile Subroutine | Provides for explicit application-level locking of stdio (FILE*) objects. |
| ftw Subroutine | Walks a file tree. |
| ftw64 Subroutine | Walks a file tree. |
| fullstat Subroutine | Provides information about a file. |
| funlockfile Subroutine | Provides for explicit application-level locking of stdio (FILE*) objects. |
| fwide Subroutine | Set stream orientation. |
| fwprintf Subroutine | Print formatted wide-character output. |
| fwrite Subroutine | Reads and writes binary files. |
| fwscanf Subroutine | Convert formatted wide-character input. |
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