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Solaris Dynamic Tracing Guide
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Document Information

Preface

1.  Introduction

2.  Types, Operators, and Expressions

3.  Variables

4.  D Program Structure

5.  Pointers and Arrays

6.  Strings

String Representation

String Constants

String Assignment

String Conversion

String Comparison

7.  Structs and Unions

8.  Type and Constant Definitions

9.  Aggregations

10.  Actions and Subroutines

11.  Buffers and Buffering

12.  Output Formatting

13.  Speculative Tracing

14.  dtrace(1M) Utility

15.  Scripting

16.  Options and Tunables

17.  dtrace Provider

18.  lockstat Provider

19.  profile Provider

20.  fbt Provider

21.  syscall Provider

22.  sdt Provider

23.  sysinfo Provider

24.  vminfo Provider

25.  proc Provider

26.  sched Provider

27.  io Provider

28.  mib Provider

29.  fpuinfo Provider

30.  pid Provider

31.  plockstat Provider

32.  fasttrap Provider

33.  User Process Tracing

34.  Statically Defined Tracing for User Applications

35.  Security

36.  Anonymous Tracing

37.  Postmortem Tracing

38.  Performance Considerations

39.  Stability

40.  Translators

41.  Versioning

Glossary

Index

String Conversion

Expressions of other types may be explicitly converted to type string by using a cast expression or by applying the special stringof operator, which are equivalent in meaning:

s = (string) expression                s = stringof ( expression )

The stringof operator binds very tightly to the operand on its right-hand side. Typically, parentheses are used to surround the expression for clarity, although they are not strictly necessary.

Any expression that is a scalar type such as a pointer or integer or a scalar array address may be converted to string. Expressions of other types such as void may not be converted to string. If you erroneously convert an invalid address to a string, the DTrace safety features will prevent you from damaging the system or DTrace, but you might end up tracing a sequence of undecipherable characters.