f90_unix: UNIX Functions Module

Table of Contents

1 Name

f90_unix — Module providing access to UNIX functions.

2 Usage

USE F90_UNIX

3 Synopsis

Parameters
CLOCK_TICK_KIND
Derived Types
TMS
Procedures

ABORT, CLOCK_TICKS_PER_SECOND, EXIT, FLUSH, GETARG, GETENV, GETGID, GETPID, GETUID, IARGC, TIMES

4 Parameter Description

  INTEGER,PARAMETER :: CLOCK_TICK_KIND
The integer kind used for clock ticks (see TIMES).

5 Derived-Type Description

  TYPE TMS
    INTEGER(CLOCK_TICK_KIND) UTIME, STIME, CUTIME, CSTIME
  END TYPE
Derived type holding CPU usage time in clock ticks. UTIME and STIME contain CPU time information for a process, CUTIME and CSTIME contain CPU time information for its terminated child processes. In each case this is divided into user time (UTIME, CUTIME) and system time (STIME, CSTIME).

6 Procedure Descriptions

  SUBROUTINE ABORT(message)

  CHARACTER*(*), OPTIONAL :: message
ABORT cleans up the i/o buffers and then terminates execution, producing a core dump on Unix systems. If MESSAGE is given it is written to logical unit 0 (zero) preceded by ‘ abort:’. 

  INTEGER (KIND=CLOCK_TICK_KIND) FUNCTION CLOCK_TICKS_PER_SECOND()
Returns the number of clock ticks in one second of CPU time (see TIMES). 

  SUBROUTINE EXIT(STATUS)

  INTEGER,OPTIONAL :: STATUS
Terminate execution as if executing the END statement of the main program (or an unadorned STOP statement). If STATUS is given it is returned to the operating system (where applicable) as the execution status code. 

  SUBROUTINE FLUSH(LUNIT)

  INTEGER,INTENT(IN) :: LUNIT
Flushes the output buffer of logical unit LUNIT which must be connected for formatted sequential output. 

  SUBROUTINE GETARG(K,ARG)

  INTEGER,INTENT(IN) :: K
  CHARACTER*(*),INTENT(OUT) :: ARG
Fetches command-line argument number K into ARG. Argument zero is the program name. Note that K must be less than or equal to the value returned by IARGC(). 

  SUBROUTINE GETENV(NAME,VALUE)

  CHARACTER*(*),INTENT(IN) :: NAME
  CHARACTER*(*),INTENT(OUT) :: VALUE
Fetches the value of the environment variable named by NAME into VALUE. If there is no such variable VALUE will be set to all blanks. 

  INTEGER FUNCTION GETGID()
Returns the numeric group number of the calling process. 

  INTEGER FUNCTION GETPID()
Returns the process number of the calling process. 

  INTEGER FUNCTION GETUID()
Returns the numeric user number of the calling process. 

  INTEGER FUNCTION IARGC()
Returns the number of command-line arguments. This will be -1 if even the program name is unavailable. 

  INTEGER(KIND=CLOCK_TICK_KIND) FUNCTION TIMES(BUFFER)

  TYPE(TMS),INTENT(OUT) :: BUFFER
This function returns the elapsed real time in clock ticks since an arbitrary point in the past, or -1 if the function is unavailable. BUFFER is filled in with CPU time information for the calling process and any terminated child processes.

If this function returns zero the values in BUFFER will still be correct but the elapsed-time timer was not available.

7 See Also

nagfor(1), intro(3), nag_modules(3).

8 Bugs

Please report any bugs found to ‘support@nag.co.uk’ or ‘support@nag.com’, along with any suggestions for improvements.