/* * Lookup a user by uid. */ #include <stdio.h> #include <pwd.h> #include <sys/types.h> int main(int argc, char **argv) { struct passwd *pw; uid_t uid; /* Check args */ if (argc != 2) { printf("ERROR: no arg specified\n"); exit(1); } if ((uid = atoi(argv[1])) == 0) { printf("ERROR: invalid uid specified\n"); exit(1); } /* Do getpwuid() */ if ((pw = getpwuid(uid)) == NULL) { printf("FAIL: uid %d does not exist\n", uid); exit(1); } printf("PASS: uid %d exists\n", uid); printf("pw_name = %s\n", pw->pw_name); printf("pw_passwd = %s\n", pw->pw_passwd); printf("pw_uid = %d\n", pw->pw_uid); printf("pw_gid = %d\n", pw->pw_gid); printf("pw_gecos = %s\n", pw->pw_gecos); printf("pw_dir = %s\n", pw->pw_dir); printf("pw_shell = %s\n", pw->pw_shell); exit(0); }