PAM登录的问题
rt,找了一个PAM编程的例子，但是调试到这边就出现问题了，哪位老大帮帮忙阿
#include <sys/types.h>#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <strings.h>#include <signal.h>#include <pwd.h>#include <errno.h>#include <security/pam_appl.h>extern int pam_tty_conv(int num_msg, struct pam_message **msg,struct pam_response **response, void *appdata_ptr);/* Disable keyboard interrupts (Ctrl-C, Ctrl-Z, Ctrl-\) */static void disable_kbd_signals(void){(void) signal(SIGINT, SIG_IGN);(void) signal(SIGTSTP, SIG_IGN);(void) signal(SIGQUIT, SIG_IGN);}/* Terminate current user session, i.e., logout */static void logout(){ pid_t pgroup = getpgrp(); (void) signal(SIGTERM, SIG_IGN); (void) fprintf(stderr, "Sorry, your session can't be restored.\n"); (void) fprintf(stderr, "Press return to terminate this session.\n"); (void) getchar(); (void) kill(-pgroup, SIGTERM); (void) sleep(2); (void) kill(-pgroup, SIGKILL); exit(-1);}int main(int argc, char *argv){ struct pam_conv conv = { pam_tty_conv, NULL }; pam_handle_t *pamh; struct passwd *pw; int err; disable_kbd_signals(); if ((pw = getpwuid(getuid())) == NULL) { (void) fprintf(stderr, "plock: Can't get username: %s\n", strerror(errno)); exit(1); } /* Initialize PAM framework */ err = pam_start("plock", pw->pw_name, &conv, &pamh); if (err != PAM_SUCCESS) { (void) fprintf(stderr, "plock: pam_start failed: %s\n", pam_strerror(pamh, err)); exit(1); } /* Authenticate user in order to unlock screen */ do { (void) fprintf(stderr, "Terminal locked for %s. ", pw->pw_name); err = pam_authenticate(pamh, 0); if (err == PAM_USER_UNKNOWN) logout(); else if (err != PAM_SUCCESS) { (void) fprintf(stderr, "Invalid password.\n"); } } while (err != PAM_SUCCESS); /* Make sure account and password are still valid */ switch (err = pam_acct_mgmt(pamh, 0)) { case PAM_USER_UNKNOWN: case PAM_ACCT_EXPIRED: /* User not allowed in anymore */ logout(); break; case PAM_NEW_AUTHTOK_REQD: /* The user's password has expired. Get a new one */ do { err = pam_chauthtok(pamh, 0); } while (err == PAM_AUTHTOK_ERR); if (err != PAM_SUCCESS) logout(); break; }if (pam_setcred(pamh, PAM_REFRESH_CRED)!= PAM_SUCCESS){ logout();} (void) pam_end(pamh, 0); exit(0);}