Author: 0mp (doc,ports committer)
Date: Fri Mar 13 11:07:48 2020
New Revision: 358954
URL: https://svnweb.freebsd.org/changeset/base/358954

Log:
  CMSG_DATA.3: Fix formatting of printf escape sequences
  
  Escape sequences like "\n" have to be escaped twice in examples in our
  mdoc(7)-based manual pages in order to be displayed properly. The problem
  is that otherwise they are interpreted by mdoc(7), which results in:
  
      printf("parent: received '%s'0, buf);
  
  being shown to the user instead of:
  
      printf("parent: received '%s'\n", buf);
  
  Approved by:  bcr (mentor)
  MFC after:    2 weeks
  Differential Revision:        https://reviews.freebsd.org/D24056

Modified:
  head/share/man/man3/CMSG_DATA.3

Modified: head/share/man/man3/CMSG_DATA.3
==============================================================================
--- head/share/man/man3/CMSG_DATA.3     Fri Mar 13 10:29:31 2020        
(r358953)
+++ head/share/man/man3/CMSG_DATA.3     Fri Mar 13 11:07:48 2020        
(r358954)
@@ -2,7 +2,7 @@
 .\" Public domain, July 3, 2005
 .\"
 .\" $FreeBSD$
-.Dd November 1, 2018
+.Dd March 13, 2020
 .Dt CMSG_DATA 3
 .Os
 .Sh NAME
@@ -142,7 +142,7 @@ main()
                            cmsg->cmsg_level == SOL_SOCKET &&
                            cmsg->cmsg_type == SCM_RIGHTS) {
                                hellofd[1] = *(int *)CMSG_DATA(cmsg);
-                               printf("child: sending '%s'\n", buf);
+                               printf("child: sending '%s'\\n", buf);
                                if (write(hellofd[1], buf, HELLOLEN) == -1)
                                    err(EX_IOERR, "failed to send 'hello'");
                        }
@@ -166,7 +166,7 @@ main()
 
                if (read(hellofd[0], buf, HELLOLEN) == -1)
                        err(EX_IOERR, "faild to receive 'hello'");
-               printf("parent: received '%s'\n", buf);
+               printf("parent: received '%s'\\n", buf);
                break;
        }
 
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