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> pam_end(3)
> pam_get_item(3)
> pam_set_item(3)
> pam_strerror(3)
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man page of pam_get_user

pam_get_user: get user name


pam_get_user - get user name


#include <security/pam_modules.h> int pam_get_user(const pam_handle_t *pamh, const char **user, const char *prompt);


The pam_get_user function returns the name of the user specified by pam_start(3). If no user was specified it what pam_get_item (pamh, PAM_USER, ... ); would have returned. If this is NULL it obtains the username via the pam_conv(3) mechanism, it prompts the user with the first non-NULL string in the following list: o The prompt argument passed to the function. o What is returned by pam_get_item (pamh, PAM_USER_PROMPT, ... ); o The default prompt: "login: " By whatever means the username is obtained, a pointer to it is returned as the contents of *user. Note, this memory should not be free()'d or modified by the module. This function sets the PAM_USER item associated with the pam_set_item(3) and pam_get_item(3) functions.
PAM_SUCCESS User name was successful retrieved. PAM_SYSTEM_ERR A NULL pointer was submitted. PAM_CONV_ERR The conversation method supplied by the application failed to obtain the username.
pam_end(3), pam_get_item(3), pam_set_item(3), pam_strerror(3) PAM_GET_USER(3)

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