Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 7/13/2023
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

Portability Library Routines

The following tables list library routines for portability.

If you have programs that use these routines, it is recommended that they access the portability library with USE IFPORT.

Some routines in this library can be called with different sets of arguments, and some can be used as a function or a subroutine. In these cases, the arguments and calling mechanism determine the meaning of the routine. The IFPORT module contains generic interface blocks that give procedure definitions for these routines.

Fortran contains intrinsic procedures for many of the portability functions. The portability routines are extensions to the Fortran 2018 standard. For portability and performance, you should write code using Fortran standard intrinsic procedures whenever possible.

Information Retrieval

Name

Procedure Type

Description

FOR_IFCORE_VERSION

Function

Returns the version of the Fortran runtime library (ifcore).

FOR_IFPORT_VERSION

Function

Returns the version of the Fortran portability library (ifport).

FSTAT

Function

Returns information about a logical file unit.

GETCWD

Function

Returns the pathname of the current working directory.

GETENV

Subroutine

Searches the environment for a given string and returns its value if found.

GETGID

Function

Returns the group ID of the user.

GETLOG

Subroutine

Returns the user's login name.

GETPID

Function

Returns the process ID of the process.

GETUID

Function

Returns the user ID of the user of the process.

HOSTNAM1

Function

Returns the name of the user's host.

ISATTY

Function

Checks whether a logical unit number is a terminal.

LSTAT

Function

Returns information about a named file. STAT is the preferred form of this function.

RENAME

Function

Renames a file.

STAT

Function

Returns information about a named file.

UNLINK

Function

Deletes the file given by path.

Process Control

Name

Procedure Type

Description

ABORT

Subroutine

Stops execution of the current process, clears I/O buffers, and writes a string to external unit 0.

ALARM

Function

Executes an external subroutine after waiting a specified number of seconds.

KILL

Function

Sends a signal code to the process given by ID.

SIGNAL

Function

Changes the action for signal.

SLEEP

Subroutine

Suspends program execution for a specified number of seconds.

SYSTEM

Function

Executes a command in a separate shell.

Numeric Values and Conversion

Name

Procedure Type

Description

BESJ0, BESJ1,BESJN, BESY0,BESY1, BESYN

Functions

Return single-precision values of Bessel functions of the first and second kind of orders 1, 2, and n, respectively.

BIC, BIS

Subroutines

Perform bit level clear, set, and test for integers.

BIT

Function

Performs bit level clear, set, and test for integers.

CDFLOAT

Function

Converts a COMPLEX(4) argument to DOUBLE PRECISION type.

COMPLINT, COMPLREAL, COMPLLOG

Functions

Return a BIT-WISE complement or logical .NOT. of the argument.

CSMG

Function

Performs an effective BIT-WISE store under mask.

DBESJ0, DBESJ1,DBESJN, DBESY0,DBESY1, DBESYN

Functions

Return double-precision values of Bessel functions of the first and second kind of orders 1, 2, and n, respectively.

DFLOATI, DFLOATJ, DFLOATK

Functions

Convert an integer to double-precision real type.

DRAND, DRANDM

Functions

Return random numbers between 0.0 and 1.0.

DRANSET

Subroutine

Sets the seed for the random number generator.

IDFLOAT

Function

Converts an INTEGER(4) argument to double-precision real type.

IFLOATI, IFLOATJ

Functions

Convert an integer to single-precision real type.

INMAX

Function

Returns the maximum positive value for an integer.

INTC

Function

Converts an INTEGER(4) argument to INTEGER(2) type.

IRAND, IRANDM

Functions

Return a positive integer in the range 0 through 2**31-1 or 2**15-1 if called without an argument.

IRANGET

Subroutine

Returns the current seed.

IRANSET

Subroutine

Sets the seed for the random number generator.

JABS

Function

Computes an absolute value.

LONG

Function

Converts an INTEGER(2) argument to INTEGER(4) type.

QRANSET

Subroutine

Sets the seed for a sequence of pseudo-random numbers.

RAND, RANDOM2

Functions

Return random values in the range 0 through 1.0.

RANF

Function

Generates a random number between 0.0 and RAND_MAX.

RANGET

Subroutine

Returns the current seed.

RANSET

Subroutine

Sets the seed for the random number generator.

SEED

Subroutine

Changes the starting point of RANDOM.

SHORT

Function

Converts an INTEGER(4) argument to INTEGER(2) type.

SRAND

Subroutine

Seeds the random number generator used with IRAND and RAND.

Input and Output

Name

Procedure Type

Description

ACCESS

Function

Checks a file for accessibility according to mode.

CHMOD

Function

Changes file attributes.

FGETC

Function

Reads a character from an external unit.

FLUSH

Function

Flushes the buffer for an external unit to its associated file.

FPUTC

Function

Writes a character to an external unit.

FSEEK

Subroutine

Repositions a file on an external unit.

FTELL, FTELLI8

Function

Return the offset, in bytes, from the beginning of the file.

GETC

Function

Reads a character from unit 5.

GETPOS, GETPOSI8

Functions

Return the offset, in bytes, from the beginning of the file.

PUTC

Function

Writes a character to unit 6.

Date and Time

Name

Procedure Type

Description

CLOCK

Function

Returns current time in HH:MM:SS format using a 24-hour clock.

CLOCKX

Subroutine

Returns the processor clock to the nearest microsecond.

CTIME

Function

Converts system time to a 24-character ASCII string.

DATE3

Subroutine or Function

Returns the current system date.

DATE4

Subroutine

Returns the current system date.

DCLOCK

Function

Returns the elapsed time in seconds since the start of the current process.

DTIME

Function

Returns CPU time since later of (1) start of program, or (2) most recent call to DTIME.

ETIME

Function

Returns elapsed CPU time since the start of program execution.

FDATE

Subroutine or Function

Returns the current date and time as an ASCII string.

GETDAT

Subroutine

Returns the date.

GETTIM

Subroutine

Returns the time.

GMTIME

Subroutine

Returns Greenwich Mean Time as a 9-element integer array.

IDATE3

Subroutine

Returns the date either as one 3-element array or three scalar parameters (month, day, year).

IDATE4

Subroutine

Returns the date either as one 3-element array or three scalar parameters (month, day, year).

ITIME

Subroutine

Returns current time as a 3-element array (hour, minute, second).

JDATE3

Function

Returns current date as an 8-character string with the Julian date.

JDATE4

Function

Returns current date as a 10-character string with the Julian date.

LTIME

Subroutine

Returns local time as a 9-element integer array.

RTC

Function

Returns number of seconds since 00:00:00 GMT, Jan 1, 1970.

SECNDS

Function

Returns number of seconds since midnight, less the value of its argument.

SETDAT

Function

Sets the date.

SETTIM

Function

Sets the time.

TIME

Subroutine or Function

As a subroutine, returns time formatted as HH:MM:SS; as a function, returns time in seconds since 00:00:00 GMT, Jan 1, 1970.

TIMEF

Function

Returns the number of seconds since the first time this function was called (or zero).

Error Handling

Name

Procedure Type

Description

GETLASTERROR

Function

Returns the last error set.

GETLASTERRORQQ

Function

Returns the last error set by a runtime function or subroutine.

IERRNO

Function

Returns the last code error.

SETERRORMODEQQ

Subroutine

Sets the mode for handling critical errors.

Program Control

Name

Procedure Type

Description

RAISEQQ

Function

Sends an interrupt to the executing program, simulating an interrupt from the operating system.

RUNQQ

Function

Calls another program and waits for it to execute.

SIGNALQQ

Function

Controls signal handling.

SLEEPQQ

Subroutine

Delays execution of the program for the specified time.

System, Drive, and Directory

Name

Procedure Type

Description

CHDIR

Function

Changes the current working directory.

CHANGEDIRQQ

Function

Makes the specified directory the current (default) directory.

CHANGEDRIVEQQ

Function

Makes the specified drive the current drive.

DELDIRQQ

Function

Deletes a specified directory.

GETDRIVEDIRQQ

Function

Returns the current drive and directory path.

GETDRIVESIZEQQ

Function

Gets the size of the specified drive.

GETDRIVESQQ

Function

Reports the drives available to the system.

GETENVQQ

Function

Gets a value from the current environment.

MAKEDIRQQ

Function

Makes a directory with the specified directory name.

SETENVQQ

Function

Adds a new environment variable, or sets the value of an existing one.

SYSTEMQQ

Function

Executes a command by passing a command string to the operating system's command interpretor.

Speaker

Name

Procedure Type

Description

BEEPQQ

Subroutine

Sounds the speaker for a specified duration in milliseconds at a specified frequency in Hertz.

File Management

Name

Procedure Type

Description

DELFILESQQ

Function

Deletes the specified files in a specified directory.

FINDFILEQQ

Function

Searches for a file in the directories specified in the PATH environment variable.

FULLPATHQQ

Function

Returns the full path for a specified file or directory.

GETFILEINFOQQ

Function

Returns information about files with names that match a request string.

PACKTIMEQQ

Subroutine

Packs time values for use by SETFILETIMEQQ.

RENAMEFILEQQ

Function

Renames a file.

SETFILEACCESSQQ

Function

Sets file-access mode for the specified file.

SETFILETIMEQQ

Function

Sets modification time for a given file.

SPLITPATHQQ

Function

Breaks a full path into four components.

UNPACKTIMEQQ

Subroutine

Unpacks a file's packed time and date value into its component parts.

Arrays

Name

Procedure Type

Description

BSEARCHQQ

Function

Performs a binary search for a specified element on a sorted one-dimensional array of non-structure data types (derived types are not allowed).

SORTQQ

Subroutine

Sorts a one-dimensional array of non-structure data types (derived types are not allowed).

Floating-Point Inquiry and Control

Name

Procedure Type

Description

CLEARSTATUSFPQQ

Subroutine

Clears the exception flags in the floating-point processor status word.

GETCONTROLFPQQ

Subroutine

Returns the value of the floating-point processor control word.

GETSTATUSFPQQ

Subroutine

Returns the value of the floating-point processor status word.

LCWRQQ

Subroutine

Same as SETCONTROLFPQQ.

SCWRQQ

Subroutine

Same as GETCONTROLFPQQ.

SETCONTROLFPQQ

Subroutine

Sets the value of the floating-point processor control word.

SSWRQQ

Subroutine

Same as GETSTATUSFPQQ.

IEEE Functionality

Name

Procedure Type

Description

IEEE_FLAGS

Function

Sets, gets, or clears IEEE flags.

IEEE_HANDLER

Function

Establishes a handler for IEEE exceptions.

Serial Port I/O4

Name

Procedure Type

Description

SPORT_CANCEL_IO

Function

Cancels any I/O in progress to the specified port.

SPORT_CONNECT

Function

Establishes the connection to a serial port and defines certain usage parameters.

SPORT_CONNECT_EX

Function

Establishes the connection to a serial port, defines certain usage parameters, and defines the size of the internal buffer for data reception.

SPORT_GET_HANDLE

Function

Returns the Windows* handle associated with the communications port.

SPORT_GET_STATE

Function

Returns the baud rate, parity, data bits, and stop bit settings of the communications port.

SPORT_GET_STATE_EX

Function

Returns the baud rate, parity, data bits setting, stop bits, and other settings of the communications port.

SPORT_GET_TIMEOUTS

Function

Returns the user selectable timeouts for the serial port.

SPORT_PEEK_DATA

Function

Returns information about the availability of input data.

SPORT_PEEK_LINE

Function

Returns information about the availability of input records.

SPORT_PURGE

Function

Executes a purge function on the specified port.

SPORT_READ_DATA

Function

Reads available data from the port specified.

SPORT_READ_LINE

Function

Reads a record from the port specified.

SPORT_RELEASE

Function

Releases a serial port that has previously been connected.

SPORT_SET_STATE

Function

Sets the baud rate, parity, data bits and stop bit settings of the communications port.

SPORT_SET_STATE_EX

Function

Sets the baud rate, parity, data bits setting, stop bits, and other settings of the communications port.

SPORT_SET_TIMEOUTS

Function

Sets the user selectable timeouts for the serial port.

SPORT_SHOW_STATE

Function

Displays the state of a port.

SPORT_SPECIAL_FUNC

Function

Executes a communications function on a specified port.

SPORT_WRITE_DATA

Function

Outputs data to a specified port.

SPORT_WRITE_LINE

Function

Outputs data to a specified port and follows it with a record terminator.

Miscellaneous

Name

Procedure Type

Description

LNBLNK

Function

Returns the index of the last non-blank character in a string.

QSORT

Subroutine

Returns a sorted version of a one-dimensional array of a specified number of elements of a named size.

RINDEX

Function

Returns the index of the last occurrence of a substring in a string.

SCANENV

Subroutine

Scans the environment for the value of an environment variable.

TTYNAM

Subroutine

Checks whether a logical unit is a terminal.

1 This routine can also be specified as HOSTNM.

2 There is also a RANDOM subroutine in the portability library.

3 The two-digit year return value of DATE, IDATE, and JDATE may cause problems with the year 2000. Use the intrinsic subroutine DATE_AND_TIME instead.

4 Windows