Quiet gcc warnings on glibc systems that use warn_unused_result for

write(2) and others.

plugins/sudoers/check.c

@@ -216,7 +216,8 @@ update_timestamp(char *timestampdir, char *timestampfile)
 	    log_error(NO_EXIT|USE_ERRNO, "Can't open %s", timestampfile);
 	else {
 	    lock_file(fd, SUDO_LOCK);
-	    write(fd, &tty_info, sizeof(tty_info));
+	    if (write(fd, &tty_info, sizeof(tty_info)) != sizeof(tty_info))
+		log_error(NO_EXIT|USE_ERRNO, "Can't write %s", timestampfile);
 	    close(fd);
 	}
     } else {

plugins/sudoers/logging.c

@@ -452,7 +452,8 @@ send_mail(const char *fmt, ...)
     /* Daemonize - disassociate from session/tty. */
     if (setsid() == -1)
       warning("setsid");
-    (void) chdir("/");
+    if (chdir("/") == -1)
+      warning("chdir(/)");
     if ((fd = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) {
 	(void) dup2(fd, STDIN_FILENO);
 	(void) dup2(fd, STDOUT_FILENO);

plugins/sudoers/sudoreplay.c

@@ -312,9 +312,12 @@ main(int argc, char *argv[])
 	error(1, "unable to open %s", path);
     cp = NULL;
     len = 0;
-    getline(&cp, &len, lfile); /* log */
+    /* Pull out command (third line). */
-    getline(&cp, &len, lfile); /* cwd */
+    if (getline(&cp, &len, lfile) == -1 ||
-    getline(&cp, &len, lfile); /* command */
+	getline(&cp, &len, lfile) == -1 ||
+	getline(&cp, &len, lfile) == -1) {
+	error(1, "invalid log file %s", path);
+    }
     printf("Replaying sudo session: %s", cp);
     free(cp);
     fclose(lfile);

plugins/sudoers/visudo.c

@@ -290,7 +290,8 @@ edit_sudoers(struct sudoersfile *sp, char *editor, char *args, int lineno)
 	    /* Add missing newline at EOF if needed. */
 	    if (nread > 0 && buf[nread - 1] != '\n') {
 		buf[0] = '\n';
-		write(tfd, buf, 1);
+		if (write(tfd, buf, 1) != 1)
+		    error(1, "write error");
 	    }
 	}
 	(void) close(tfd);
@@ -483,8 +484,14 @@ install_sudoers(struct sudoersfile *sp, int oldperms)
 	if (stat(sp->path, &sb) == -1)
 #endif
 	    error(1, "can't stat %s", sp->path);
-	(void) chown(sp->tpath, sb.st_uid, sb.st_gid);
+	if (chown(sp->tpath, sb.st_uid, sb.st_gid) != 0) {
-	(void) chmod(sp->tpath, sb.st_mode & 0777);
+	    warning("unable to set (uid, gid) of %s to (%d, %d)",
+		sp->tpath, sb.st_uid, sb.st_gid);
+	}
+	if (chmod(sp->tpath, sb.st_mode & 0777) != 0) {
+	    warning("unable to change mode of %s to 0%o", sp->tpath,
+		(sb.st_mode & 0777));
+	}
     } else {
 	if (chown(sp->tpath, SUDOERS_UID, SUDOERS_GID) != 0) {
 	    warning("unable to set (uid, gid) of %s to (%d, %d)",
@@ -1143,8 +1150,9 @@ quit(int signo)
 {
     cleanup(signo);
 #define	emsg	 " exiting due to signal.\n"
-    write(STDERR_FILENO, getprogname(), strlen(getprogname()));
+    if (write(STDERR_FILENO, getprogname(), strlen(getprogname())) == -1 ||
-    write(STDERR_FILENO, emsg, sizeof(emsg) - 1);
+	write(STDERR_FILENO, emsg, sizeof(emsg) - 1) == -1)
+	/* shut up glibc */;
     _exit(signo);
 }
 

src/exec_pty.c

@@ -639,10 +639,14 @@ pty_close(struct command_status *cstat)
 	    const char *reason = strsignal(signo);
 	    n = io_fds[SFD_USERTTY] != -1 ?
 		io_fds[SFD_USERTTY] : STDOUT_FILENO;
-	    write(n, reason, strlen(reason));
+	    if (write(n, reason, strlen(reason)) != -1) {
-	    if (WCOREDUMP(cstat->val))
+		if (WCOREDUMP(cstat->val)) {
-		write(n, " (core dumped)", 14);
+		    if (write(n, " (core dumped)", 14) == -1)
-	    write(n, "\n", 1);
+			/* shut up glibc */;
+		}
+		if (write(n, "\n", 1) == -1)
+		    /* shut up glibc */;
+	    }
 	}
     }
 }
@@ -875,7 +879,8 @@ exec_monitor(struct command_details *details, char *argv[], char *envp[],
 	exec_pty(details, argv, envp);
 	cstat.type = CMD_ERRNO;
 	cstat.val = errno;
-	write(errpipe[1], &cstat, sizeof(cstat));
+	if (write(errpipe[1], &cstat, sizeof(cstat)) == -1)
+	    /* shut up glibc */;
 	_exit(1);
     }
     close(errpipe[1]);

src/get_pty.c

@@ -67,7 +67,8 @@ get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
 
     if (openpty(master, slave, name, NULL, NULL) != 0)
 	return(0);
-    (void) chown(name, ttyuid, ttygid);
+    if (chown(name, ttyuid, ttygid) != 0)
+	return(0);
     return(1);
 }
 

src/tgetpass.c

@@ -150,8 +150,10 @@ restart:
     sa.sa_handler = SIG_IGN;
     (void) sigaction(SIGPIPE, &sa, &savepipe);
 
-    if (prompt)
+    if (prompt) {
-	(void) write(output, prompt, strlen(prompt));
+	if (write(output, prompt, strlen(prompt)) == -1)
+	    goto restore;
+    }
 
     if (timeout > 0)
 	alarm(timeout);
@@ -159,9 +161,12 @@ restart:
     alarm(0);
     save_errno = errno;
 
-    if (neednl || pass == NULL)
+    if (neednl || pass == NULL) {
-	(void) write(output, "\n", 1);
+	if (write(output, "\n", 1) == -1)
+	    goto restore;
+    }
 
+restore:
     /* Restore old tty settings and signals. */
     if (!ISSET(flags, TGP_ECHO))
 	term_restore(input, 1);
@@ -277,20 +282,23 @@ getln(int fd, char *buf, size_t bufsiz, int feedback)
 	if (feedback) {
 	    if (c == term_kill) {
 		while (cp > buf) {
-		    (void) write(fd, "\b \b", 3);
+		    if (write(fd, "\b \b", 3) == -1)
+			break;
 		    --cp;
 		}
 		left = bufsiz;
 		continue;
 	    } else if (c == term_erase) {
 		if (cp > buf) {
-		    (void) write(fd, "\b \b", 3);
+		    if (write(fd, "\b \b", 3) == -1)
+			break;
 		    --cp;
 		    left++;
 		}
 		continue;
 	    }
-	    (void) write(fd, "*", 1);
+	    if (write(fd, "*", 1) == -1)
+		/* shut up glibc */;
 	}
 	*cp++ = c;
     }
@@ -298,7 +306,8 @@ getln(int fd, char *buf, size_t bufsiz, int feedback)
     if (feedback) {
 	/* erase stars */
 	while (cp > buf) {
-	    (void) write(fd, "\b \b", 3);
+	    if (write(fd, "\b \b", 3) == -1)
+		break;
 	    --cp;
 	}
     }