05-01-2009
Quote:
Originally Posted by
shamrock
You can declare and initialize variables globally
Only C++ lets you initialize global variables from function return values, and I don't think it guarantees what order they're set in -- it could call fopen before getenv gets called. C only lets you initialize them from constant values.
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getenv(3C) Standard C Library Functions getenv(3C)
NAME
getenv - return value for environment name
SYNOPSIS
#include <stdlib.h>
char *getenv(const char *name);
DESCRIPTION
The getenv() function searches the environment list (see environ(5)) for a string of the form name=value and, if the string is present,
returns a pointer to the value in the current environment.
RETURN VALUES
If successful, getenv() returns a pointer to the value in the current environment; otherwise, it returns a null pointer.
USAGE
The getenv() function can be safely called from a multithreaded application. Care must be exercised when using both getenv() and
putenv(3C) in a multithreaded application. These functions examine and modify the environment list, which is shared by all threads in an
application. The system prevents the list from being accessed simultaneously by two different threads. It does not, however, prevent two
threads from successively accessing the environment list using getenv() or putenv(3C).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |Safe |
+-----------------------------+-----------------------------+
SEE ALSO
exec(2), putenv(3C), attributes(5), environ(5), standards(5)
SunOS 5.10 24 Jul 2002 getenv(3C)