개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(1M)을 검색하려면 섹션에서 1M 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

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.


       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 pre‐
       vents 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(7) for descriptions of the following attributes:


       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelSafe _ Standard‐
       See standards(7).


SEE ALSO
       exec(2),  getenv(3C),  malloc(3C),  attributes(7),  environ(7),   stan‐
       dards(7)

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.



Oracle Solaris 11.4               7 Aug 2004                        putenv(3C)