centos man page for pam_putenv

PAM_PUTENV(3)							 Linux-PAM Manual						     PAM_PUTENV(3)

NAME
       pam_putenv - set or change PAM environment variable

SYNOPSIS
       #include <security/pam_appl.h>

       int pam_putenv(pam_handle_t *pamh, const char *name_value);

DESCRIPTION
       The pam_putenv function is used to add or change the value of PAM environment variables as associated with the pamh handle.

       The pamh argument is an authentication handle obtained by a prior call to pam_start(). The name_value argument is a single NUL terminated
       string of one of the following forms:

       NAME=value of variable
	   In this case the environment variable of the given NAME is set to the indicated value: value of variable. If this variable is already
	   known, it is overwritten. Otherwise it is added to the PAM environment.

       NAME=
	   This function sets the variable to an empty value. It is listed separately to indicate that this is the correct way to achieve such a
	   setting.

       NAME
	   Without an '=' the pam_putenv() function will delete the corresponding variable from the PAM environment.

       pam_putenv() operates on a copy of name_value, which means in contrast to putenv(3), the application is responsible to free the data.

RETURN VALUES
       PAM_PERM_DENIED
	   Argument name_value given is a NULL pointer.

       PAM_BAD_ITEM
	   Variable requested (for deletion) is not currently set.

       PAM_ABORT
	   The pamh handle is corrupt.

       PAM_BUF_ERR
	   Memory buffer error.

       PAM_SUCCESS
	   The environment variable was successfully updated.

SEE ALSO
       pam_start(3), pam_getenv(3), pam_getenvlist(3), pam_strerror(3), pam(8)

Linux-PAM Manual						    09/19/2013							     PAM_PUTENV(3)