putenv(3c) [hpux man page]

putenv(3C)																putenv(3C)

NAME

       putenv() - change or add value to environment

SYNOPSIS

DESCRIPTION

       string  points to a string of the form name=value.  makes the value of the environment variable name equal to value by altering an existing
       variable or creating a new one.	In either case, the string pointed to by string becomes part of the environment, so  altering  the  string
       changes the environment.  The space used by string is no longer used once a new string-defining name is passed to

EXTERNAL INFLUENCES

   Locale
       The category determines the interpretation of characters in string as single- and/or multi-byte characters.

   International Code Set Support
       Single- and multi-byte character code sets are supported.

DIAGNOSTICS

       returns non-zero if it was unable to obtain enough space via for an expanded environment, or if an invalid multibyte character sequence was
       encountered in the string argument; otherwise it returns zero.

ERRORS

       fails under the following conditions:

	      [ENOMEM]	     There is insufficient space to expand the environment.

	      [EILSEQ]	     An invalid multibyte character sequence was encountered in the string argument.

WARNINGS

       manipulates the environment pointed to by environ, and can be used in conjunction with However, envp (the third argument to  main)  is  not
       changed.

       This routine uses to enlarge the environment (see malloc(3C)).

       After is called, environmental variables are not in alphabetical order.

       A  potential  error is to call with an automatic variable as the argument, then exit the calling function while string is still part of the
       environment.

SEE ALSO

       exec(2), getenv(3C), malloc(3C), environ(5), thread_safety(5).

STANDARDS CONFORMANCE

																	putenv(3C)

putenv(3C)						   Standard C Library Functions 						putenv(3C)

NAME

       putenv - change or add value to environment

SYNOPSIS

       #include <stdlib.h>

       int putenv(char *string);

DESCRIPTION

       The  putenv()  function	makes the value of the environment variable name equal to value by altering an existing variable or creating a new
       one. In either case, the string pointed to by string becomes part of the environment, so altering the string will change the environment.

       The string argument points to a string of the form name=value. The space used by string is no longer used once a new  string-defining  name
       is passed to putenv().

       The putenv() function uses malloc(3C) to enlarge the environment.

       putenv() is called, environment variables are not in alphabetical order.

RETURN VALUES

       Upon successful completion, putenv() returns 0. Otherwise, it returns a non-zero value and sets errno to indicate the error.

ERRORS

       The putenv() function may fail if:

       ENOMEM	       Insufficient memory was available.

USAGE

       The  putenv() function can be safely called from multithreaded programs.  Caution must be exercised when using this function and getenv(3C)
       in multithreaded programs.
	These functions examine and modify the environment list, which is shared by all threads in a program.  The system prevents the	list  from
       being accessed simultaneously by two different threads.	It does not, however, prevent two threads from successively accessing the environ-
       ment list using putenv() or getenv().

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       exec(2), getenv(3C), malloc(3C), attributes(5), environ(5), standards(5)

WARNINGS

       The string argument should not be an automatic variable.  It should be declared static if it is declared within a function because it  can-
       not  be	automatically  declared. A potential error is to call putenv() with a pointer to an automatic variable as the argument and to then
       exit the calling function while string is still part of the environment.

SunOS 5.10							    7 Aug 2004								putenv(3C)