/* * Use set/get/endpwent calls from two processes to iterate over the * password database. This checks the multithreaded stuff works. */ #include <stdio.h> #include <pwd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <errno.h> #include <wait.h> void dump_pwent(char *id) { struct passwd *pw; char fname[255]; FILE *fptr; /* Open results file */ sprintf(fname, "/tmp/getpwent_r-%s.out-%d", id, getpid()); if ((fptr = fopen(fname, "w")) < 0) { fprintf(stderr, "ERROR: could not open file %s: %s\n", fname, sys_errlist[errno]); return; } /* Dump passwd database */ setpwent(); while((pw = getpwent()) != NULL) { fprintf(fptr,"%s:%s:%s:%d:%d\n", pw->pw_name, pw->pw_passwd, pw->pw_gecos, pw->pw_uid, pw->pw_gid); } endpwent(); /* Close results file */ fclose(fptr); } #define NUM_FORKS 2 int main(int argc, char **argv) { pid_t pids[NUM_FORKS]; int i, status; /* Check args */ if (argc != 2) { printf("ERROR: must specify output file identifier\n"); return 1; } for(i = 0; i < NUM_FORKS; i++) { /* Fork off lots */ if ((pids[i] = fork()) == -1) { perror("fork"); return 1; } /* Child does tests */ if (pids[i] == 0) { dump_pwent(argv[1]); return 0; } } /* Wait for everyone to finish */ for (i = 0; i < NUM_FORKS; i++) { waitpid(pids[i], &status, 0); } printf("PASS: getpwent_r.c\n"); return 0; }