What Happens When You Compile and Link a Program

Linking Programs on HP-UX

Table 2-1

32-bit Mode Magic Number Linker Options

 

 

 

 

 

 

To set the magic

Use this

 

 

number to:

option:

SHARE_MAGIC

-n

DEMAND_MAGIC

-q

EXEC_MAGIC

-N

An executable file's magic number can also be changed using the chatr command (see “Changing a Program's Attributes with chatr(1)” on page 104). However, chatr can only toggle between SHARE_MAGIC and DEMAND_MAGIC; it cannot be used to change from or to EXEC_MAGIC. This is because the file format of SHARE_MAGIC and DEMAND_MAGIC is exactly the same, while EXEC_MAGIC files have a different format. For details on magic numbers, refer to magic(4).

In 64-bit mode, the linker sets the magic number to the predefined type for ELF object files (\177ELF). The value of the E_TYPE in the ELF object file specifies how the file should be loaded.

File Permissions

If no linker errors occur, the linker gives the a.out file read/write/execute permissions to all users (owner, group, and other). If errors occurred, the linker gives read/write permissions to all users. Permissions are further modified if the umask is set (see umask(1)). For example, on a system with umask set to 022, a successful link produces an a.out file with read/write/execute permissions for the owner, and read/execute permissions for group and other:

$ umask

 

022

 

$ ls -l a.out

 

-rwxr-xr-x 1 michael users

74440 Apr 4 14:38 a.out

Chapter 2

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Kenwood HP 9000 manual File Permissions, Bit Mode Magic Number Linker Options, To set the magic Use this Number to Option
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HP 9000 specifications

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