putenv(3)                  Library Functions Manual                  putenv(3)

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       putenv - <?><?><?><?><?><?><?><?> <?><?><?> <?><?><?><?><?><?><?><?><?>
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LIBRARY
       Standard C library (libc, -lc)

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       #include <stdlib.h>

       int putenv(char *string);

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   <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?> <?><?><?> glibc
   (<?><?>. feature_test_macros(7)):

       putenv():
           _XOPEN_SOURCE
               || /* glibc >= 2.19: */ _DEFAULT_SOURCE
               || /* glibc <= 2.19: */ _SVID_SOURCE

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       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?>.
       <?><?><?><?><?><?><?><?> string <?><?><?><?><?><?> <?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?> <?> <?><?><?><?><?> name=value.
       <?><?><?><?> <?><?><?><?><?><?><?><?><?><?> <?> <?><?><?><?><?><?> name
       <?><?><?> <?> <?><?><?><?><?><?><?><?><?>, <?><?> string
       <?><?><?><?><?><?><?><?><?><?><?> <?> <?><?><?><?><?><?><?><?><?>.
       <?><?><?><?> <?><?><?><?><?><?><?><?><?><?> name <?><?><?>
       <?><?><?><?><?><?><?><?><?><?>, <?><?> <?><?><?><?><?><?><?><?> name
       <?> <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?> <?><?>
       value. <?><?><?><?><?><?>, <?><?> <?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?> string, <?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?>, <?><?><?> <?><?><?>
       <?><?> <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> <?>
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?>.

<?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?>
       The putenv()  function returns zero on success.  On failure, it returns
       a nonzero value, and errno is set to indicate the error.

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       ENOMEM <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?>
              <?><?><?> <?><?><?><?><?> <?><?><?><?><?><?><?><?><?>.

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       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> <?> attributes(7).

       +----------------------------+----------------------------------------------------------+--------------------------+
       |<?><?><?><?><?><?><?><?><?> | <?><?><?><?><?><?><?>                                    | <?><?><?><?><?><?><?><?> |
       +----------------------------+----------------------------------------------------------+--------------------------+
       |putenv()                    | <?><?><?><?><?><?><?><?><?><?><?><?> <?> <?><?><?><?><?> | MT-Unsafe const:env      |
       +----------------------------+----------------------------------------------------------+--------------------------+
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       POSIX.1-2008.

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       POSIX.1-2001, SVr2, 4.3BSD-Reno.

       <?><?> <?><?><?><?><?><?><?> putenv() <?><?>
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       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>, <?> <?><?><?>
       <?><?><?><?><?><?> <?> glibc 2.0, <?><?> <?> glibc 2.1 <?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?><?>.

       Since glibc 2.1.2, the glibc implementation conforms to SUSv2: the
       pointer string given to putenv()  is used.  In particular, this string
       becomes part of the environment; changing it later will change the
       environment.  (Thus, it is an error to call putenv()  with an automatic
       variable as the argument, then return from the calling function while
       string is still part of the environment.)  However, from glibc 2.0 to
       glibc 2.1.1, it differs: a copy of the string is used.  On the one hand
       this causes a memory leak, and on the other hand it violates SUSv2.

       The 4.3BSD-Reno version, like glibc 2.0, uses a copy; this is fixed in
       all modern BSDs.

       <?> SUSv2 <?><?><?><?><?><?><?> const <?><?>
       <?><?><?><?><?><?><?><?><?> <?> <?><?><?> <?><?><?><?><?><?><?> <?>
       glibc 2.1.3.

       <?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?> GNU C
       <?><?><?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?>.
       <?><?><?><?> string <?><?> <?><?><?><?><?><?><?><?> <?><?><?><?><?>
       <?><?><?><?><?>:

           putenv("NAME");

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       <?><?><?><?><?><?><?><?><?><?><?>.

<?><?>. <?><?><?><?><?>
       clearenv(3), getenv(3), setenv(3), unsetenv(3), environ(7)

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       <?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?> <?><?><?>
       <?><?><?><?><?><?> Alexey, Azamat Hackimov <azamat.hackimov@gmail.com>,
       kogamatranslator49 <r.podarov@yandex.ru>, Kogan, Max Is
       <ismax799@gmail.com>, Yuri Kozlov <yuray@komyakino.ru> <?> <?><?><?><?>
       <?><?><?><?><?><?> <pavia00@gmail.com>

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       <?><?><?><?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?> GNU
       <?><?><?><?><?><?> 3 <https://www.gnu.org/licenses/gpl-3.0.html>
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       <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>.

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       <?><?><?><?><?><?><?><?><?><?><?>, <?><?><?><?><?><?><?><?><?><?>,
       <?><?><?><?><?><?><?><?><?> <?><?><?><?><?><?><?><?><?><?><?>
       <?><?><?><?><?><?> <?><?> <man-pages-ru-talks@lists.sourceforge.net>.

Linux man-pages 6.06  31 <?><?><?><?><?><?><?> 2023 <?>.             putenv(3)