*: introduce and use ffulsh_all()

function                                             old     new   delta
buffer_fill_and_print                                179     196     +17
fflush_all                                             -       9      +9
spawn                                                 87      92      +5
rtcwake_main                                         455     453      -2
...
alarm_intr                                            93      84      -9
readcmd                                             1072    1062     -10
bb_ask                                               345     333     -12
more_main                                            845     832     -13
flush_stdout_stderr                                   42      23     -19
xfflush_stdout                                        27       -     -27
flush_stderr                                          30       -     -30
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 2/50 up/down: 31/-397)         Total: -366 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

49 files changed, 84 insertions, 96 deletions

diff --git a/archival/cpio.c b/archival/cpio.c
index ef228990a..41aeef171 100644
--- a/archival/cpio.c
+++ b/archival/cpio.c
@@ -252,7 +252,7 @@ static NOINLINE int cpio_o(void)
 				free(lpath);
 			} else { /* S_ISREG */
 				int fd = xopen(name, O_RDONLY);
-				fflush(stdout);
+				fflush_all();
 				/* We must abort if file got shorter too! */
 				bb_copyfd_exact_size(fd, STDOUT_FILENO, st.st_size);
 				bytes += st.st_size;
diff --git a/coreutils/dd.c b/coreutils/dd.c
index 8bba62ce1..f1e63fd8b 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -189,7 +189,7 @@ int dd_main(int argc UNUSED_PARAM, char **argv)
 
 	memset(&Z, 0, sizeof(Z));
 	INIT_G();
-	//fflush(NULL); - is this needed because of NOEXEC?
+	//fflush_all(); - is this needed because of NOEXEC?
 
 	for (n = 1; argv[n]; n++) {
 		int what;
diff --git a/coreutils/dirname.c b/coreutils/dirname.c
index c0c0925e5..1f5f70dfd 100644
--- a/coreutils/dirname.c
+++ b/coreutils/dirname.c
@@ -23,5 +23,5 @@ int dirname_main(int argc, char **argv)
 
 	puts(dirname(argv[1]));
 
-	return fflush(stdout);
+	return fflush_all();
 }
diff --git a/coreutils/echo.c b/coreutils/echo.c
index decca095f..69039969b 100644
--- a/coreutils/echo.c
+++ b/coreutils/echo.c
@@ -141,7 +141,7 @@ int echo_main(int argc UNUSED_PARAM, char **argv)
 		bb_putchar('\n');
 	}
  ret:
-	return fflush(stdout);
+	return fflush_all();
 }
 
 /*-
diff --git a/coreutils/hostid.c b/coreutils/hostid.c
index 2794510a7..6f007d847 100644
--- a/coreutils/hostid.c
+++ b/coreutils/hostid.c
@@ -22,5 +22,5 @@ int hostid_main(int argc, char **argv UNUSED_PARAM)
 
 	printf("%lx\n", gethostid());
 
-	return fflush(stdout);
+	return fflush_all();
 }
diff --git a/coreutils/length.c b/coreutils/length.c
index 43a0f5988..015b2216f 100644
--- a/coreutils/length.c
+++ b/coreutils/length.c
@@ -18,5 +18,5 @@ int length_main(int argc, char **argv)
 
 	printf("%u\n", (unsigned)strlen(*argv));
 
-	return fflush(stdout);
+	return fflush_all();
 }
diff --git a/coreutils/logname.c b/coreutils/logname.c
index 7983d1704..7e5013255 100644
--- a/coreutils/logname.c
+++ b/coreutils/logname.c
@@ -36,7 +36,7 @@ int logname_main(int argc, char **argv UNUSED_PARAM)
 	/* Using _r function - avoid pulling in static buffer from libc */
 	if (getlogin_r(buf, sizeof(buf)) == 0) {
 		puts(buf);
-		return fflush(stdout);
+		return fflush_all();
 	}
 
 	bb_perror_msg_and_die("getlogin");
diff --git a/coreutils/pwd.c b/coreutils/pwd.c
index 57953d246..11278a2a5 100644
--- a/coreutils/pwd.c
+++ b/coreutils/pwd.c
@@ -20,7 +20,7 @@ int pwd_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 	if (buf != NULL) {
 		puts(buf);
 		free(buf);
-		return fflush(stdout);
+		return fflush_all();
 	}
 
 	return EXIT_FAILURE;
diff --git a/coreutils/seq.c b/coreutils/seq.c
index 03ae3c632..84d11fd8c 100644
--- a/coreutils/seq.c
+++ b/coreutils/seq.c
@@ -95,5 +95,5 @@ int seq_main(int argc, char **argv)
 	if (n) /* if while loop executed at least once */
 		bb_putchar('\n');
 
-	return fflush(stdout);
+	return fflush_all();
 }
diff --git a/coreutils/whoami.c b/coreutils/whoami.c
index 0dbcba955..1031cdbf8 100644
--- a/coreutils/whoami.c
+++ b/coreutils/whoami.c
@@ -22,5 +22,5 @@ int whoami_main(int argc, char **argv UNUSED_PARAM)
 	/* Will complain and die if username not found */
 	puts(xuid2uname(geteuid()));
 
-	return fflush(stdout);
+	return fflush_all();
 }
diff --git a/editors/awk.c b/editors/awk.c
index bc1d93868..ce6c9b726 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -2552,7 +2552,7 @@ static var *evaluate(node *op, var *res)
 				break;
 
 			case F_sy:
-				fflush(NULL);
+				fflush_all();
 				R.d = (ENABLE_FEATURE_ALLOW_EXEC && L.s && *L.s)
 						? (system(L.s) >> 8) : 0;
 				break;
@@ -2565,7 +2565,7 @@ static var *evaluate(node *op, var *res)
 						X.rsm = newfile(L.s);
 						fflush(X.rsm->F);
 					} else {
-						fflush(NULL);
+						fflush_all();
 					}
 				}
 				break;
diff --git a/editors/cmp.c b/editors/cmp.c
index a20bb8836..384e57c22 100644
--- a/editors/cmp.c
+++ b/editors/cmp.c
@@ -108,7 +108,7 @@ int cmp_main(int argc UNUSED_PARAM, char **argv)
 				outfile = stderr;
 				/* There may have been output to stdout (option -l), so
 				 * make sure we fflush before writing to stderr. */
-				xfflush_stdout();
+				fflush_all();
 			}
 			if (!(opt & CMP_OPT_s)) {
 				if (opt & CMP_OPT_l) {
diff --git a/editors/ed.c b/editors/ed.c
index dbd802075..8ed4cd42b 100644
--- a/editors/ed.c
+++ b/editors/ed.c
@@ -686,7 +686,7 @@ static int readLines(const char *file, int num)
 	cc = 0;
 
 	printf("\"%s\", ", file);
-	fflush(stdout);
+	fflush_all();
 
 	do {
 		cp = memchr(bufPtr, '\n', bufUsed);
@@ -775,7 +775,7 @@ static int writeLines(const char *file, int num1, int num2)
 	}
 
 	printf("\"%s\", ", file);
-	fflush(stdout);
+	fflush_all();
 
 	lp = findLine(num1);
 	if (lp == NULL) {
diff --git a/editors/vi.c b/editors/vi.c
index 82f302dca..1a3997a6b 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -2136,7 +2136,7 @@ static void rawmode(void)
 
 static void cookmode(void)
 {
-	fflush(stdout);
+	fflush_all();
 	tcsetattr_stdin_TCSANOW(&term_orig);
 }
 
@@ -2201,7 +2201,7 @@ static int readit(void) // read (maybe cursor) key from stdin
 {
 	int c;
 
-	fflush(stdout);
+	fflush_all();
 	c = read_key(STDIN_FILENO, readbuffer);
 	if (c == -1) { // EOF/error
 		go_bottom_and_clear_to_eol();
@@ -2555,7 +2555,7 @@ static void show_status_line(void)
 		}
 		place_cursor(crow, ccol, FALSE);	// put cursor back in correct place
 	}
-	fflush(stdout);
+	fflush_all();
 }
 
 //----- format the status buffer, the bottom line of screen ------
@@ -3963,7 +3963,7 @@ static void crash_test()
 	if (msg[0]) {
 		printf("\n\n%d: \'%c\' %s\n\n\n%s[Hit return to continue]%s",
 			totalcmds, last_input_char, msg, SOs, SOn);
-		fflush(stdout);
+		fflush_all();
 		while (safe_read(STDIN_FILENO, d, 1) > 0) {
 			if (d[0] == '\n' || d[0] == '\r')
 				break;
diff --git a/findutils/xargs.c b/findutils/xargs.c
index 76d1d5489..ab1a6d0a5 100644
--- a/findutils/xargs.c
+++ b/findutils/xargs.c
@@ -279,7 +279,7 @@ static int xargs_ask_confirmation(void)
 
 	tty_stream = xfopen_for_read(CURRENT_TTY);
 	fputs(" ?...", stderr);
-	fflush(stderr);
+	fflush_all();
 	c = savec = getc(tty_stream);
 	while (c != EOF && c != '\n')
 		c = getc(tty_stream);
diff --git a/include/libbb.h b/include/libbb.h
index d2b74377e..955287c4d 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -659,7 +659,7 @@ extern char *xmalloc_fgetline(FILE *file) FAST_FUNC;
 
 extern void die_if_ferror(FILE *file, const char *msg) FAST_FUNC;
 extern void die_if_ferror_stdout(void) FAST_FUNC;
-extern void xfflush_stdout(void) FAST_FUNC;
+extern int fflush_all(void) FAST_FUNC;
 extern void fflush_stdout_and_exit(int retval) NORETURN FAST_FUNC;
 extern int fclose_if_not_stdin(FILE *file) FAST_FUNC;
 extern FILE *xfopen(const char *filename, const char *mode) FAST_FUNC;
diff --git a/libbb/bb_askpass.c b/libbb/bb_askpass.c
index 073175c1f..f9b918cec 100644
--- a/libbb/bb_askpass.c
+++ b/libbb/bb_askpass.c
@@ -55,7 +55,7 @@ char* FAST_FUNC bb_ask(const int fd, int timeout, const char *prompt)
 	}
 
 	fputs(prompt, stdout);
-	fflush(stdout);
+	fflush_all();
 	ret = NULL;
 	/* On timeout or Ctrl-C, read will hopefully be interrupted,
 	 * and we return NULL */
@@ -77,6 +77,6 @@ char* FAST_FUNC bb_ask(const int fd, int timeout, const char *prompt)
 
 	tcsetattr_stdin_TCSANOW(&oldtio);
 	bb_putchar('\n');
-	fflush(stdout);
+	fflush_all();
 	return ret;
 }
diff --git a/libbb/info_msg.c b/libbb/info_msg.c
index 8b8a1fcca..5f375d43b 100644
--- a/libbb/info_msg.c
+++ b/libbb/info_msg.c
@@ -44,7 +44,7 @@ void FAST_FUNC bb_info_msg(const char *s, ...)
 	if (ENABLE_FEATURE_SYSLOG && (logmode & LOGMODE_SYSLOG))
 		syslog(LOG_INFO, "%s", msg);
 	if (logmode & LOGMODE_STDIO) {
-		fflush(stdout);
+		fflush_all();
 		/* used = strlen(msg); - must be true already */
 		msg[used++] = '\n';
 		full_write(STDOUT_FILENO, msg, used);
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 0f7ab8c94..a9972576e 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -373,7 +373,7 @@ static void input_backward(unsigned num)
 static void put_prompt(void)
 {
 	out1str(cmdedit_prompt);
-	fflush(NULL);
+	fflush_all();
 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
 	{
 		/* Ask terminal where is the cursor now.
@@ -411,7 +411,7 @@ static void put_prompt(void)
 		if (safe_poll(&pfd, 1, 0) == 0) {
 			S.sent_ESC_br6n = 1;
 			out1str("\033" "[6n");
-			fflush(NULL); /* make terminal see it ASAP! */
+			fflush_all(); /* make terminal see it ASAP! */
 		}
 	}
 #endif
@@ -1636,7 +1636,7 @@ static void cmdedit_setwidth(unsigned w, int redraw_flg)
 		int new_y = (cursor + cmdedit_prmt_len) / w;
 		/* redraw */
 		redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
-		fflush(NULL);
+		fflush_all();
 	}
 }
 
@@ -1748,7 +1748,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
 	) {
 		/* Happens when e.g. stty -echo was run before */
 		parse_and_put_prompt(prompt);
-		/* fflush(stdout); - done by parse_and_put_prompt */
+		/* fflush_all(); - done by parse_and_put_prompt */
 		if (fgets(command, maxsize, stdin) == NULL)
 			len = -1; /* EOF or error */
 		else
@@ -1841,7 +1841,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
 		};
 		int32_t ic, ic_raw;
 
-		fflush(NULL);
+		fflush_all();
 		ic = ic_raw = lineedit_read_key(read_key_buffer);
 
 #if ENABLE_FEATURE_EDITING_VI
@@ -2245,7 +2245,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
 	tcsetattr_stdin_TCSANOW(&initial_settings);
 	/* restore SIGWINCH handler */
 	signal(SIGWINCH, previous_SIGWINCH_handler);
-	fflush(NULL);
+	fflush_all();
 
 	len = command_len;
 	DEINIT_S();
@@ -2259,7 +2259,7 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
 int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
 {
 	fputs(prompt, stdout);
-	fflush(NULL);
+	fflush_all();
 	fgets(command, maxsize, stdin);
 	return strlen(command);
 }
diff --git a/libbb/login.c b/libbb/login.c
index 07247a8c5..740c588f3 100644
--- a/libbb/login.c
+++ b/libbb/login.c
@@ -85,7 +85,7 @@ void FAST_FUNC print_login_issue(const char *issue_file, const char *tty)
 		fputs(outbuf, stdout);
 	}
 	fclose(fp);
-	fflush(stdout);
+	fflush_all();
 }
 
 void FAST_FUNC print_login_prompt(void)
@@ -94,7 +94,7 @@ void FAST_FUNC print_login_prompt(void)
 
 	fputs(hostname, stdout);
 	fputs(LOGIN, stdout);
-	fflush(stdout);
+	fflush_all();
 	free(hostname);
 }
 
diff --git a/libbb/verror_msg.c b/libbb/verror_msg.c
index 506b9066a..70f792f39 100644
--- a/libbb/verror_msg.c
+++ b/libbb/verror_msg.c
@@ -64,7 +64,7 @@ void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
 	}
 
 	if (logmode & LOGMODE_STDIO) {
-		fflush(stdout);
+		fflush_all();
 		full_write(STDERR_FILENO, msg, used);
 	}
 	if (logmode & LOGMODE_SYSLOG) {
@@ -125,8 +125,8 @@ void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
 		iov[1].iov_len = 2;
 		/*iov[2].iov_base = msgc;*/
 		/*iov[2].iov_len = used;*/
-		fflush(stdout);
-		writev(2, iov, 3);
+		fflush_all();
+		writev(STDERR_FILENO, iov, 3);
 	}
 	if (logmode & LOGMODE_SYSLOG) {
 		syslog(LOG_ERR, "%s", msgc);
diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c
index 27efb0e37..9be901722 100644
--- a/libbb/vfork_daemon_rexec.c
+++ b/libbb/vfork_daemon_rexec.c
@@ -25,7 +25,7 @@ pid_t FAST_FUNC spawn(char **argv)
 	volatile int failed;
 	pid_t pid;
 
-// Ain't it a good place to fflush(NULL)?
+	fflush_all();
 
 	/* Be nice to nommu machines. */
 	failed = 0;
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c
index 241887ace..644134a0e 100644
--- a/libbb/xfuncs_printf.c
+++ b/libbb/xfuncs_printf.c
@@ -255,12 +255,9 @@ void FAST_FUNC die_if_ferror_stdout(void)
 	die_if_ferror(stdout, bb_msg_standard_output);
 }
 
-// Die with an error message if we have trouble flushing stdout.
-void FAST_FUNC xfflush_stdout(void)
+int FAST_FUNC fflush_all(void)
 {
-	if (fflush(stdout)) {
-		bb_perror_msg_and_die(bb_msg_standard_output);
-	}
+	return fflush(NULL);
 }
 
 
@@ -276,9 +273,9 @@ int FAST_FUNC bb_putchar(int ch)
  * then close that file. */
 void FAST_FUNC xprint_and_close_file(FILE *file)
 {
-	fflush(stdout);
+	fflush_all();
 	// copyfd outputs error messages for us.
-	if (bb_copyfd_eof(fileno(file), 1) == -1)
+	if (bb_copyfd_eof(fileno(file), STDOUT_FILENO) == -1)
 		xfunc_die();
 
 	fclose(file);
diff --git a/loginutils/login.c b/loginutils/login.c
index c3e31d05d..1ffa965c2 100644
--- a/loginutils/login.c
+++ b/loginutils/login.c
@@ -137,7 +137,7 @@ static void die_if_nologin(void)
 		puts("\r\nSystem closed for routine maintenance\r");
 
 	fclose(fp);
-	fflush(NULL);
+	fflush_all();
 	/* Users say that they do need this prior to exit: */
 	tcdrain(STDOUT_FILENO);
 	exit(EXIT_FAILURE);
@@ -250,7 +250,7 @@ static void motd(void)
 
 	fd = open(bb_path_motd_file, O_RDONLY);
 	if (fd >= 0) {
-		fflush(stdout);
+		fflush_all();
 		bb_copyfd_eof(fd, STDOUT_FILENO);
 		close(fd);
 	}
@@ -263,7 +263,7 @@ static void alarm_handler(int sig UNUSED_PARAM)
 	 * We don't want to block here */
 	ndelay_on(1);
 	printf("\r\nLogin timed out after %d seconds\r\n", TIMEOUT);
-	fflush(NULL);
+	fflush_all();
 	/* unix API is brain damaged regarding O_NONBLOCK,
 	 * we should undo it, or else we can affect other processes */
 	ndelay_off(1);
diff --git a/mailutils/mail.c b/mailutils/mail.c
index 68883ff42..64a5b996f 100644
--- a/mailutils/mail.c
+++ b/mailutils/mail.c
@@ -87,7 +87,7 @@ const FAST_FUNC char *command(const char *fmt, const char *param)
 		msg = xasprintf(fmt, param);
 		printf("%s\r\n", msg);
 	}
-	fflush(stdout);
+	fflush_all();
 	return msg;
 }
 
diff --git a/miscutils/flash_eraseall.c b/miscutils/flash_eraseall.c
index 4f3e94dc1..ba0a6b515 100644
--- a/miscutils/flash_eraseall.c
+++ b/miscutils/flash_eraseall.c
@@ -43,7 +43,7 @@ static void show_progress(mtd_info_t *meminfo, erase_info_t *erase)
 	printf("\rErasing %d Kibyte @ %x -- %2llu %% complete.",
 		(unsigned)meminfo->erasesize / 1024, erase->start,
 		(unsigned long long) erase->start * 100 / meminfo->size);
-	fflush(stdout);
+	fflush_all();
 }
 
 int flash_eraseall_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
diff --git a/miscutils/hdparm.c b/miscutils/hdparm.c
index c4d2f3b03..399b77a4a 100644
--- a/miscutils/hdparm.c
+++ b/miscutils/hdparm.c
@@ -1406,7 +1406,7 @@ static void do_time(int cache /*,int fd*/)
 	} else { /* Time device */
 		printf("Timing buffered disk reads:");
 	}
-	fflush(stdout);
+	fflush_all();
 
 	/* Now do the timing */
 	iterations = 0;
diff --git a/miscutils/less.c b/miscutils/less.c
index ce77ddd3a..48f3a751f 100644
--- a/miscutils/less.c
+++ b/miscutils/less.c
@@ -157,7 +157,7 @@ struct globals {
 /* Reset terminal input to normal */
 static void set_tty_cooked(void)
 {
-	fflush(stdout);
+	fflush_all();
 	tcsetattr(kbd_fd, TCSANOW, &term_orig);
 }
 
@@ -835,7 +835,7 @@ static int getch_nowait(void)
 	/* Position cursor if line input is done */
 	if (less_gets_pos >= 0)
 		move_cursor(max_displayed_line + 2, less_gets_pos + 1);
-	fflush(stdout);
+	fflush_all();
 
 	if (kbd_input[0] == 0) { /* if nothing is buffered */
 #if ENABLE_FEATURE_LESS_WINCH
diff --git a/networking/arping.c b/networking/arping.c
index 71690cf30..e3418a945 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -237,7 +237,7 @@ static bool recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
 		} else {
 			printf(" UNSOLICITED?\n");
 		}
-		fflush(stdout);
+		fflush_all();
 	}
 	received++;
 	if (FROM->sll_pkttype != PACKET_HOST)
diff --git a/networking/ftpd.c b/networking/ftpd.c
index 70a353312..9937cc3ea 100644
--- a/networking/ftpd.c
+++ b/networking/ftpd.c
@@ -630,7 +630,7 @@ popen_ls(const char *opt)
 	cwd = xrealloc_getcwd_or_warn(NULL);
 	xpiped_pair(outfd);
 
-	/*fflush(NULL); - so far we dont use stdio on output */
+	/*fflush_all(); - so far we dont use stdio on output */
 	pid = BB_MMU ? fork() : vfork();
 	if (pid < 0)
 		bb_perror_msg_and_die(BB_MMU ? "fork" : "vfork");
diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index d0c5cce07..88d1944da 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -969,7 +969,7 @@ static int doit(char *str)
 		pid_t child;
 		int status;
 
-		fflush(NULL);
+		fflush_all();
 		child = vfork();
 		switch (child) {
 		case -1: /* failure */
@@ -1038,7 +1038,7 @@ static int popen2(FILE **in, FILE **out, char *command, char *param)
 	xpiped_pair(infd);
 	xpiped_pair(outfd);
 
-	fflush(NULL);
+	fflush_all();
 	pid = vfork();
 
 	switch (pid) {
diff --git a/networking/libiproute/ipaddress.c b/networking/libiproute/ipaddress.c
index 86d27548b..fcf9623e4 100644
--- a/networking/libiproute/ipaddress.c
+++ b/networking/libiproute/ipaddress.c
@@ -182,7 +182,7 @@ static NOINLINE int print_linkinfo(const struct nlmsghdr *n)
 		}
 	}
 	bb_putchar('\n');
-	/*fflush(stdout);*/
+	/*fflush_all();*/
 	return 0;
 }
 
@@ -344,7 +344,7 @@ static int FAST_FUNC print_addrinfo(const struct sockaddr_nl *who UNUSED_PARAM,
 		printf("       %s", buf);
 	}
 	bb_putchar('\n');
-	/*fflush(stdout);*/
+	/*fflush_all();*/
 	return 0;
 }
 
diff --git a/networking/libiproute/iprule.c b/networking/libiproute/iprule.c
index e52473117..659f3a9f0 100644
--- a/networking/libiproute/iprule.c
+++ b/networking/libiproute/iprule.c
@@ -151,7 +151,7 @@ static int FAST_FUNC print_rule(const struct sockaddr_nl *who UNUSED_PARAM,
 		fputs(rtnl_rtntype_n2a(r->rtm_type, b1), stdout);
 
 	bb_putchar('\n');
-	/*fflush(stdout);*/
+	/*fflush_all();*/
 	return 0;
 }
 
diff --git a/networking/nc_bloaty.c b/networking/nc_bloaty.c
index 9aaeec100..ad98bed30 100644
--- a/networking/nc_bloaty.c
+++ b/networking/nc_bloaty.c
@@ -152,7 +152,7 @@ enum {
 /* Debug: squirt whatever message and sleep a bit so we can see it go by. */
 /* Beware: writes to stdOUT... */
 #if 0
-#define Debug(...) do { printf(__VA_ARGS__); printf("\n"); fflush(stdout); sleep(1); } while (0)
+#define Debug(...) do { printf(__VA_ARGS__); printf("\n"); fflush_all(); sleep(1); } while (0)
 #else
 #define Debug(...) do { } while (0)
 #endif
diff --git a/networking/ping.c b/networking/ping.c
index 71b2a4be8..d30eb5cfa 100644
--- a/networking/ping.c
+++ b/networking/ping.c
@@ -491,7 +491,7 @@ static void unpack_tail(int sz, uint32_t *tp,
 	if (tp)
 		printf(" time=%u.%03u ms", triptime / 1000, triptime % 1000);
 	puts(dupmsg);
-	fflush(stdout);
+	fflush_all();
 }
 static void unpack4(char *buf, int sz, struct sockaddr_in *from)
 {
diff --git a/networking/telnetd.c b/networking/telnetd.c
index 163efaa42..b0a1cc4d8 100644
--- a/networking/telnetd.c
+++ b/networking/telnetd.c
@@ -288,7 +288,7 @@ make_new_session(
 		/*ts->size2 = 0;*/
 	}
 
-	fflush(NULL); /* flush all streams */
+	fflush_all();
 	pid = vfork(); /* NOMMU-friendly */
 	if (pid < 0) {
 		free(ts);
@@ -331,7 +331,7 @@ make_new_session(
 	/*termbuf.c_lflag &= ~ICANON;*/
 	tcsetattr_stdin_TCSANOW(&termbuf);
 
-	/* Uses FILE-based I/O to stdout, but does fflush(stdout),
+	/* Uses FILE-based I/O to stdout, but does fflush_all(),
 	 * so should be safe with vfork.
 	 * I fear, though, that some users will have ridiculously big
 	 * issue files, and they may block writing to fd 1,
diff --git a/networking/traceroute.c b/networking/traceroute.c
index 7284f0022..fa45db98a 100644
--- a/networking/traceroute.c
+++ b/networking/traceroute.c
@@ -815,7 +815,7 @@ int traceroute_main(int argc, char **argv)
 
 			if (!first && pausemsecs > 0)
 				usleep(pausemsecs * 1000);
-			fflush(stdout);
+			fflush_all();
 
 			t1 = monotonic_us();
 			send_probe(++seq, ttl);
diff --git a/procps/top.c b/procps/top.c
index 252f6f74b..79915697c 100644
--- a/procps/top.c
+++ b/procps/top.c
@@ -632,7 +632,7 @@ static NOINLINE void display_process_list(int lines_rem, int scr_width)
 	}
 	/* printf(" %d", hist_iterations); */
 	bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
-	fflush(stdout);
+	fflush_all();
 }
 #undef UPSCALE
 #undef SHOW_STAT
@@ -856,7 +856,7 @@ static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
 		s++;
 	}
 	bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
-	fflush(stdout);
+	fflush_all();
 #undef HDR_STR
 #undef MIN_WIDTH
 }
diff --git a/procps/watch.c b/procps/watch.c
index 5fd051072..f446ec918 100644
--- a/procps/watch.c
+++ b/procps/watch.c
@@ -64,7 +64,7 @@ int watch_main(int argc UNUSED_PARAM, char **argv)
 
 			puts(header);
 		}
-		fflush(stdout);
+		fflush_all();
 		// TODO: 'real' watch pipes cmd's output to itself
 		// and does not allow it to overflow the screen
 		// (taking into account linewrap!)
diff --git a/runit/svlogd.c b/runit/svlogd.c
index b7fd15262..9a00fadee 100644
--- a/runit/svlogd.c
+++ b/runit/svlogd.c
@@ -1152,7 +1152,7 @@ int svlogd_main(int argc, char **argv)
 			/* Move unprocessed data to the front of line */
 			memmove((timestamp ? line+26 : line), lineptr, stdin_cnt);
 		}
-		fflush(NULL);////
+		fflush_all();////
 	}
 
 	for (i = 0; i < dirn; ++i) {
diff --git a/scripts/echo.c b/scripts/echo.c
index 9e591c4d5..85a8aa913 100644
--- a/scripts/echo.c
+++ b/scripts/echo.c
@@ -187,7 +187,7 @@ int main(int argc, char **argv)
 		putchar('\n');
 	}
  ret:
-	return fflush(stdout);
+	return fflush_all();
 }
 
 /*-
diff --git a/selinux/setfiles.c b/selinux/setfiles.c
index aabc37137..0a4643784 100644
--- a/selinux/setfiles.c
+++ b/selinux/setfiles.c
@@ -286,7 +286,7 @@ static int restore(const char *file)
 			if (count == 0)
 				bb_putchar('\n');
 			bb_putchar('*');
-			fflush(stdout);
+			fflush_all();
 		}
 	}
 
diff --git a/shell/ash.c b/shell/ash.c
index 481b84138..6b985ad7c 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -389,16 +389,7 @@ static void
 flush_stdout_stderr(void)
 {
 	INT_OFF;
-	fflush(stdout);
-	fflush(stderr);
-	INT_ON;
-}
-
-static void
-flush_stderr(void)
-{
-	INT_OFF;
-	fflush(stderr);
+	fflush_all();
 	INT_ON;
 }
 
@@ -451,7 +442,7 @@ static void
 out2str(const char *p)
 {
 	outstr(p, stderr);
-	flush_stderr();
+	flush_stdout_stderr();
 }
 
 
@@ -8184,7 +8175,7 @@ evaltree(union node *n, int flags)
 	default:
 #if DEBUG
 		out1fmt("Node type = %d\n", n->type);
-		fflush(stdout);
+		fflush_all();
 		break;
 #endif
 	case NNOT:
@@ -9101,7 +9092,7 @@ evalcommand(union node *cmd, int flags)
 		for (;;) {
 			find_command(argv[0], &cmdentry, cmd_flag, path);
 			if (cmdentry.cmdtype == CMDUNKNOWN) {
-				flush_stderr();
+				flush_stdout_stderr();
 				status = 127;
 				goto bail;
 			}
diff --git a/shell/hush.c b/shell/hush.c
index 1187cbe8f..891d87be7 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -1206,7 +1206,7 @@ static void hush_exit(int exitcode)
 	}
 
 #if ENABLE_HUSH_JOB
-	fflush(NULL); /* flush all streams */
+	fflush_all();
 	sigexit(- (exitcode & 0xff));
 #else
 	exit(exitcode);
@@ -1679,7 +1679,7 @@ static void get_user_input(struct in_str *i)
 	do {
 		G.flag_SIGINT = 0;
 		fputs(prompt_str, stdout);
-		fflush(stdout);
+		fflush_all();
 		G.user_input_buf[0] = r = fgetc(i->file);
 		/*G.user_input_buf[1] = '\0'; - already is and never changed */
 //do we need check_and_run_traps(0)? (maybe only if stdin)
@@ -3220,7 +3220,7 @@ static void exec_function(char ***to_free,
 	G.global_argc = n;
 	/* On MMU, funcp->body is always non-NULL */
 	n = run_list(funcp->body);
-	fflush(NULL);
+	fflush_all();
 	_exit(n);
 # else
 	re_execute_shell(to_free,
@@ -3307,7 +3307,7 @@ static void exec_builtin(char ***to_free,
 {
 #if BB_MMU
 	int rcode = x->function(argv);
-	fflush(NULL);
+	fflush_all();
 	_exit(rcode);
 #else
 	/* On NOMMU, we must never block!
@@ -3933,7 +3933,7 @@ static NOINLINE int run_pipe(struct pipe *pi)
 					debug_printf_exec(": builtin '%s' '%s'...\n",
 						x->cmd, argv_expanded[1]);
 					rcode = x->function(argv_expanded) & 0xff;
-					fflush(NULL);
+					fflush_all();
 				}
 #if ENABLE_HUSH_FUNCTIONS
 				else {
@@ -7136,7 +7136,7 @@ static int FAST_FUNC builtin_export(char **argv)
 				putchar('\n');
 #endif
 			}
-			/*fflush(stdout); - done after each builtin anyway */
+			/*fflush_all(); - done after each builtin anyway */
 		}
 		return EXIT_SUCCESS;
 	}
@@ -7181,7 +7181,7 @@ static int FAST_FUNC builtin_trap(char **argv)
 				printf(" %s\n", get_signame(i));
 			}
 		}
-		/*fflush(stdout); - done after each builtin anyway */
+		/*fflush_all(); - done after each builtin anyway */
 		return EXIT_SUCCESS;
 	}
 
diff --git a/sysklogd/logread.c b/sysklogd/logread.c
index 603a3776c..932bbecbb 100644
--- a/sysklogd/logread.c
+++ b/sysklogd/logread.c
@@ -135,7 +135,7 @@ int logread_main(int argc UNUSED_PARAM, char **argv)
 		} else { /* logread -f */
 			if (cur == shbuf_tail) {
 				sem_up(log_semid);
-				fflush(stdout);
+				fflush_all();
 				sleep(1); /* TODO: replace me with a sleep_on */
 				continue;
 			}
diff --git a/util-linux/fsck_minix.c b/util-linux/fsck_minix.c
index cdd306031..cc9eec22d 100644
--- a/util-linux/fsck_minix.c
+++ b/util-linux/fsck_minix.c
@@ -341,7 +341,7 @@ static int ask(const char *string, int def)
 	}
 	printf(def ? "%s (y/n)? " : "%s (n/y)? ", string);
 	for (;;) {
-		fflush(NULL);
+		fflush_all();
 		c = getchar();
 		if (c == EOF) {
 			if (!def)
diff --git a/util-linux/mkfs_minix.c b/util-linux/mkfs_minix.c
index cf757610b..8819cee4e 100644
--- a/util-linux/mkfs_minix.c
+++ b/util-linux/mkfs_minix.c
@@ -505,7 +505,7 @@ static void alarm_intr(int alnum UNUSED_PARAM)
 	if (!G.currently_testing)
 		return;
 	printf("%d ...", G.currently_testing);
-	fflush(stdout);
+	fflush_all();
 }
 
 static void check_blocks(void)
diff --git a/util-linux/more.c b/util-linux/more.c
index 9ac4dd8e3..555f033d4 100644
--- a/util-linux/more.c
+++ b/util-linux/more.c
@@ -114,7 +114,7 @@ int more_main(int argc UNUSED_PARAM, char **argv)
 						(int) (ftello(file)*100 / st.st_size),
 						st.st_size);
 				}
-				fflush(stdout);
+				fflush_all();
 
 				/*
 				 * We've just displayed the "--More--" prompt, so now we need
@@ -189,7 +189,7 @@ int more_main(int argc UNUSED_PARAM, char **argv)
 			putchar(c);
 		}
 		fclose(file);
-		fflush(stdout);
+		fflush_all();
 	} while (*argv && *++argv);
  end:
 	setTermSettings(cin_fileno, &initial_settings);
diff --git a/util-linux/rtcwake.c b/util-linux/rtcwake.c
index f90f73ced..049f699f5 100644
--- a/util-linux/rtcwake.c
+++ b/util-linux/rtcwake.c
@@ -172,7 +172,7 @@ int rtcwake_main(int argc UNUSED_PARAM, char **argv)
 
 	sync();
 	printf("wakeup from \"%s\" at %s", suspend, ctime(&alarm_time));
-	fflush(NULL);
+	fflush_all();
 	usleep(10 * 1000);
 
 	if (strcmp(suspend, "on"))