Standardize apps use of -rand, etc.

Standardized the -rand flag and added a new one:
    -rand file...
            Always reads the specified files
    -writerand file
            Always writes to the file on exit

For apps that use a config file, the RANDFILE config parameter reads
the file at startup (to seed the RNG) and write to it on exit if
the -writerand flag isn't used.

Ensured that every app that took -rand also took -writerand, and
made sure all of that agreed with all the documentation.

Fix error reporting in write_file and -rand

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/3862)

1 files changed, 11 insertions, 5 deletions

diff --git a/doc/man1/rand.pod b/doc/man1/rand.pod
index 0faf6872a2..22482033fc 100644
--- a/doc/man1/rand.pod
+++ b/doc/man1/rand.pod
@@ -9,7 +9,8 @@ rand - generate pseudo-random bytes
 B<openssl rand>
 [B<-help>]
 [B<-out> I<file>]
-[B<-rand> I<file(s)>]
+[B<-rand file...>]
+[B<-writerand file>]
 [B<-base64>]
 [B<-hex>]
 I<num>
@@ -31,18 +32,23 @@ seeding was obtained from these sources.
 
 Print out a usage message.
 
-=item B<-out> I<file>
+=item B<-out file>
 
 Write to I<file> instead of standard output.
 
-=item B<-rand> I<file(s)>
+=item B<-rand file...>
 
-Use specified file or files or EGD socket (see L<RAND_egd(3)>)
-for seeding the random number generator.
+A file or files containing random data used to seed the random number
+generator.
 Multiple files can be specified separated by an OS-dependent character.
 The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
 all others.
 
+=item [B<-writerand file>]
+
+Writes random data to the specified I<file> upon exit.
+This can be used with a subsequent B<-rand> flag.
+
 =item B<-base64>
 
 Perform base64 encoding on the output.