?? reenter.c
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#include "apue.h"#include <pwd.h>static voidmy_alarm(int signo){ struct passwd *rootptr; printf("in signal handler\n"); if ((rootptr = getpwnam("root")) == NULL) err_sys("getpwnam(root) error"); alarm(1);}intmain(void){ struct passwd *ptr; signal(SIGALRM, my_alarm); alarm(1); for ( ; ; ) { if ((ptr = getpwnam("sar")) == NULL) err_sys("getpwnam error"); if (strcmp(ptr->pw_name, "sar") != 0) printf("return value corrupted!, pw_name = %s\n", ptr->pw_name); }}
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