Shulou(Shulou.com)06/03 Report--

Process environment:

Exit (): some processing operations are performed (including calling to execute various handlers, closing all standard IO streams) and then entering the kernel.

_ exit ():

_ Exit (): goes directly to the kernel.

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Enable the 1999ISOC compiler

$cc-std=c99 hello.c

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Atexit (void (* func) (void))

The registration termination handler, the same handler, will be called in the opposite order after several registrations.

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Environment table

Environment pointer (global variable)

Extern char * * environ

To get environment variables, you usually use getenv () putenv () to access specific environment variables.

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Storage space layout of C program

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