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Annotation of researchv10dc/dist/man/v4/man3/ierror.3, revision 1.1.1.1

1.1       root        1: .th IERROR III 10/29/73
                      2: .sh NAME
                      3: ierror \*- catch Fortran errors
                      4: .sh SYNOPSIS
                      5: .ft B
                      6: if ( ierror ( \fIerrno\fB ) .ne. 0 ) goto \fIlabel\fR
                      7: .sh DESCRIPTION
                      8: .it Ierror
                      9: provides a way of detecting errors during the running of a Fortran
                     10: program.
                     11: Its argument is a run-time error number
                     12: such as enumerated in
                     13: .it fc
                     14: (I).
                     15: .s3
                     16: When
                     17: .it ierror
                     18: is called,
                     19: it returns a 0 value; thus the
                     20: .bd goto
                     21: statement in the synopsis is not executed.
                     22: However, the routine stores inside itself the
                     23: call point and invocation level.
                     24: If and when the indicated error occurs,
                     25: a
                     26: .bd return
                     27: is simulated from
                     28: .it ierror
                     29: with a non-zero value;
                     30: thus the
                     31: .bd goto
                     32: (or other statement)
                     33: is executed.
                     34: It is a ghastly error to call
                     35: .it ierror
                     36: from a subroutine which
                     37: has already returned when the error occurs.
                     38: .s3
                     39: This routine is essentially tailored to
                     40: catching end-of-file situations.
                     41: Typically it is called just before the start
                     42: of the loop which reads the input file,
                     43: and the
                     44: .bd goto
                     45: jumps to a graceful termination of the program.
                     46: .s3
                     47: There is a limit of 5 on the number
                     48: of different error numbers which can be caught.
                     49: .sh "SEE ALSO"
                     50: fc (I)
                     51: .sh BUGS
                     52: There is no way to ignore errors.

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