svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
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 en‐
vironment, 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().
If the string argument points to a string without an '=' character,
then the equivalent of unsetenv(3C) is performed.
The putenv() function may use 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:
EINVAL The string argument is not of the form "name=value", or
"name", as described above.
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), setenv(3C), unsetenv(3C), attrib‐
utes(7), environ(7), standards(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.
HISTORY
Support for string arguments without an '=' character to unset a vari‐
able was added in Oracle Solaris 11.4.27.
The putenv() function has been included in all Sun and Oracle releases
of Solaris.
Oracle Solaris 11.4 4 Aug 2022 putenv(3C)