EXIT_SUCCESS.3const, EXIT_FAILURE.3const: Add page and link

Signed-off-by: Thomas Voss <mail@thomasvoss.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

diff --git a/man3const/EXIT_FAILURE.3const b/man3const/EXIT_FAILURE.3const
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+++ b/man3const/EXIT_FAILURE.3const
@@ -0,0 +1 @@
+.so man3const/EXIT_SUCCESS.3const

diff --git a/man3const/EXIT_SUCCESS.3const b/man3const/EXIT_SUCCESS.3const
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+++ b/man3const/EXIT_SUCCESS.3const
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+.\" Copyright (c) 2022 by Thomas Voss <mail@thomasvoss.com>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.\"
+.TH EXIT_SUCCESS 3const (date) "Linux man-pages (unreleased)"
+.SH NAME
+EXIT_SUCCESS, EXIT_FAILURE \- termination status constants
+.SH LIBRARY
+Standard C library
+.RI ( libc )
+.SH SYNOPSIS
+.nf
+.B #include <stdlib.h>
+.PP
+.BR "#define EXIT_SUCCESS  "  0
+.BR "#define EXIT_FAILURE  "  "/* nonzero */"
+.fi
+.SH DESCRIPTION
+.B EXIT_SUCCESS
+and
+.B EXIT_FAILURE
+represent a successful and unsuccessful exit status respectively,
+and can be used as arguments to the
+.BR exit (3)
+function.
+.SH CONFORMING TO
+C99 and later;
+POSIX.1-2001 and later.
+.SH EXAMPLES
+.\" SRC BEGIN (EXIT_SUCCESS.c)
+.EX
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main(int argc, char *argv[])
+{
+    FILE *fp;
+
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s <file>\en", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+
+    if ((fp = fopen(argv[1], "r")) == NULL) {
+        perror(argv[1]);
+        exit(EXIT_FAILURE);
+    }
+
+    /* Other code omitted */
+
+    fclose(fp);
+    exit(EXIT_SUCCESS);
+}
+.EE
+.\" SRC END
+.SH SEE ALSO
+.BR exit (3),
+.BR sysexits.h (3head)