PGI Fortran Reference manual - The Portland Group

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3F Functions and VAX Subroutines9.1.53. renameRename a file.Synopsisinteger function rename(from, to)character*(*) fromcharacter*(*) toDescriptionRenames the existing file from where the new name is, the from value, to what you want it to be,the to value.. If the rename is successful, zero is returned; otherwise, the return value is an errorcode.9.1.54. rindexReturn index of substring.Synopsisinteger function rindex(a1, a2)character*(*) a1character*(*) a2DescriptionReturn the index of the last occurrence of string a2 in string a1.9.1.55. secnds, dsecndsReturn elapsed time.Synopsisreal function secnds(x)real xdouble precision function dsecnds(x)double precision xDescriptionReturns the elapsed time, in seconds, since midnight, minus the value of x.9.1.56. setvbufChange I/O buffering behavior.PGI Fortran Reference Guide 206
3F Functions and VAX SubroutinesSynopsisinteger function setvbuf(lu, typ, size, buf)integer luinteger typinteger sizecharacter* (*) bufDescriptionFortran I/O supports 3 types of buffering:‣ Fully buffered: on output, data is written once the buffer is full. On input, the buffer is filledwhen an input operation is requested and the buffer is empty.‣ Line buffered: on output, data is written when a newline character is inserted in the buffer orwhen the buffer is full. On input, if an input operation is encountered and the buffer is empty,the buffer is filled until a newline character is encountered.‣ Unbuffered: No buffer is used. Each I/O operation is completed as soon as possible. In thiscase, the typ and size arguments are ignored.Logical units 5 (stdin) and 6 (stdout) are line buffered. Logical unit 0 (stderr) is unbuffered.Disk files are fully buffered. These defaults generally give the expected behavior. You can usesetvbuf3f to change a unit's buffering type and size of the buffer.The underlying stdio implementation may silently restrict your choice of buffer size.This function must be called after the unit is opened and before any I/O is done on the unit.The typ parameter can have the following values, 0 specifies full buffering, 1 specifies linebuffering, and 2 specifies unbuffered. The size parameter specifies the size of the buffer. Note,the underlying stdio implementation may silently restrict your choice of buffer size.The buf parameter is the address of the new buffer.The buffer specified by the buf and size parameters must remain available to the Fortran runtime until afterthe logical unit is closed.This function returns zero on success and non-zero on failure.An example of a program in which this function might be useful is a long-running program thatperiodically writes a small amount of data to a log file. If the log file is line buffered, you couldcheck the log file for progress. If the log file is fully buffered (the default), the data may not bewritten to disk until the program terminates.9.1.57. setvbuf3fChange I/O buffering behavior.PGI Fortran Reference Guide 207
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LIST OF TABLESTable 1 Fortran Chara
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PREFACEThis manual describes the Po
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PrefaceInteroperability with C, des
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PrefacePGI Fortran Reference Guide
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Language Overview‣ Fixed source f
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Fortran Data TypesType Meaning Size
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