From e22ebb893e2f44bd08f69f9ce4ccfc5e4d2990e2 Mon Sep 17 00:00:00 2001
From: Dimitri Papadopoulos
 <3234522+DimitriPapadopoulos@users.noreply.github.com>
Date: Sun, 6 Aug 2023 19:44:37 +0200
Subject: [PATCH] Bad function definition

void f() should probably be void f(void)

Found by running the checkpatch.pl Linux script to enforce coding style.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21468)
---
 apps/s_server.c         | 2 +-
 crypto/sha/keccak1600.c | 2 +-
 demos/sslecho/main.c    | 2 +-
 include/internal/e_os.h | 6 +++---
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/apps/s_server.c b/apps/s_server.c
index 1dc04d0060..93f6cb2983 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -266,7 +266,7 @@ typedef struct {
     char buff[1];
 } EBCDIC_OUTBUFF;
 
-static const BIO_METHOD *BIO_f_ebcdic_filter()
+static const BIO_METHOD *BIO_f_ebcdic_filter(void)
 {
     if (methods_ebcdic == NULL) {
         methods_ebcdic = BIO_meth_new(BIO_TYPE_EBCDIC_FILTER,
diff --git a/crypto/sha/keccak1600.c b/crypto/sha/keccak1600.c
index 17909a769b..062111b638 100644
--- a/crypto/sha/keccak1600.c
+++ b/crypto/sha/keccak1600.c
@@ -1153,7 +1153,7 @@ void SHA3_sponge(const unsigned char *inp, size_t len,
 
 # include <stdio.h>
 
-int main()
+int main(void)
 {
     /*
      * This is 5-bit SHAKE128 test from http://csrc.nist.gov/groups/ST/toolkit/examples.html#aHashing
diff --git a/demos/sslecho/main.c b/demos/sslecho/main.c
index bdc824f2c7..8cf7744501 100644
--- a/demos/sslecho/main.c
+++ b/demos/sslecho/main.c
@@ -118,7 +118,7 @@ void configure_client_context(SSL_CTX *ctx)
     }
 }
 
-void usage()
+void usage(void)
 {
     printf("Usage: sslecho s\n");
     printf("       --or--\n");
diff --git a/include/internal/e_os.h b/include/internal/e_os.h
index 6d15bc55ee..d0e903f653 100644
--- a/include/internal/e_os.h
+++ b/include/internal/e_os.h
@@ -152,7 +152,7 @@ static __inline unsigned int _strlen31(const char *str)
 #     undef stdin
 #     undef stdout
 #     undef stderr
-FILE *__iob_func();
+FILE *__iob_func(void);
 #     define stdin  (&__iob_func()[0])
 #     define stdout (&__iob_func()[1])
 #     define stderr (&__iob_func()[2])
@@ -304,12 +304,12 @@ struct servent *getservbyname(const char *name, const char *proto);
 #  define gethostbyname(name)                gethostbyname((char*)name)
 #  define ioctlsocket(a,b,c)	ioctl(a,b,c)
 #  ifdef NO_GETPID
-inline int nssgetpid();
+inline int nssgetpid(void);
 #   ifndef NSSGETPID_MACRO
 #    define NSSGETPID_MACRO
 #    include <cextdecs.h(PROCESSHANDLE_GETMINE_)>
 #    include <cextdecs.h(PROCESSHANDLE_DECOMPOSE_)>
-       inline int nssgetpid()
+       inline int nssgetpid(void)
        {
          short phandle[10]={0};
          union pseudo_pid {