putenv man page on SmartOS

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PUTENV(3C)							    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.

       After 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 environ‐
       ment  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 environment 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),	 stan‐
       dards(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	cannot
       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.

				  Aug 7, 2004			    PUTENV(3C)
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