putenv(3)
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putenv Subroutine
change or add value to environment
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SYNTAX
int putenv (string)
char *string;
DESCRIPTION
String points to a string of the form name=value. Putenv 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 space used by string is no longer used once a new string-
defining name is passed to putenv.
DIAGNOSTICS
Putenv returns non-zero if it couldn't obtain enough space via
malloc for an expanded environment. Otherwise, it returns zero.
SEE ALSO
exec(2), getenv(3C), malloc(3C), environ(5).
WARNINGS
Putenv manipulates the environment pointed to by environ, and can
be used in conjunction with getenv. However, envp (the third
argument to main) is not changed.
This routine uses malloc(3C) to enlarge the environment.
After putenv is called, environmental variables are not in
alphabetical order.
A potential error is to call putenv with an automatic variable as
the argument, then exit the calling function while string is
still part of the environment.
DG/UX 4.00 Page 1
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