1GETENV(3)                  Linux Programmer's Manual                 GETENV(3)
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NAME

6       getenv - get an environment variable
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SYNOPSIS

9       #include <stdlib.h>
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11       char *getenv(const char *name);
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DESCRIPTION

14       The  getenv()  function searches the environment list to find the envi‐
15       ronment variable name, and returns a pointer to the corresponding value
16       string.
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RETURN VALUE

19       The  getenv()  function  returns a pointer to the value in the environ‐
20       ment, or NULL if there is no match.
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CONFORMING TO

23       SVr4, POSIX.1-2001, 4.3BSD, C89, C99.
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NOTES

26       The strings in the environment list are of the form name=value.
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28       As typically implemented, getenv() returns a pointer to a string within
29       the  environment  list.   The  caller must take care not to modify this
30       string, since that would change the environment of the process.
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32       The implementation of getenv() is not required to  be  reentrant.   The
33       string  pointed  to  by  the return value of getenv() may be statically
34       allocated, and can be  modified  by  a  subsequent  call  to  getenv(),
35       putenv(3), setenv(3), or unsetenv(3).
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SEE ALSO

38       clearenv(3), putenv(3), setenv(3), unsetenv(3), environ(7)
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COLOPHON

41       This  page  is  part of release 3.22 of the Linux man-pages project.  A
42       description of the project, and information about reporting  bugs,  can
43       be found at http://www.kernel.org/doc/man-pages/.
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47GNU                               2008-03-17                         GETENV(3)
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