Red Hat ENTERPRISE LINUX 3 - DEVELOPER TOOLS GUIDE Dokumentacja Pobierz pdf (Strona 22)

Red Hat Enterprise Linux to Oracle Solaris Porting Guide

The story is little different for member data in a structure, union, or class objects. The struct

member variables must be aligned to the highest bytes of the size of any member variables to prevent

performance penalties.

// 4-byte alignment

struct mystruct

{

char a; // size = 1 byte

// 3 bytes padding

int i; // size = 4 bytes

};

In the above example, the size of mystruct is 8 bytes.

// 8-byte alignment

struct mystruct_1

{

char a; // size = 1 byte

// 7 bytes padding

double i; // size = 8 bytes

};

In the above example, the size of mystruct_1 is 16 bytes.

Low-Level Code, Bit-Level Operations

When migrating from a 32-bit RHEL application to a 64-bit Oracle Solaris SPARC application, the

bit-shifting operations used inattentively in typical legacy C code can cause lots of problems. The

following example is a function that does a shift operation. Note that untyped integral constants are of

type unsigned int. During shifting, this can lead to unexpected truncation.

For example, in the following code, the maximum value for

i can be 31. This is because the type of

“1 << i” is int.

long j = 1 << i;

To get the shift done on a 64-bit SPARC system, 1L should be used, as shown below:

long j = 1L << i;

System APIs

System Call Mapping

Both RHEL and Oracle Solaris are UNIX operating systems that follow the POSIX standard. Both

provide well-defined system call interfaces. Most of the system calls available on RHEL are also

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