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Red Hat Bugzilla – Attachment 587253 Details for
Bug 644003
cmsg(3) manpage incomplete, broken examples
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[patch]
cmsg.patch
cmsg.patch (text/plain), 957 bytes, created by
Peter Schiffer
on 2012-05-28 15:11:26 UTC
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Description:
cmsg.patch
Filename:
MIME Type:
Creator:
Peter Schiffer
Created:
2012-05-28 15:11:26 UTC
Size:
957 bytes
patch
obsolete
>--- cmsg.3.org 2012-05-10 22:13:20.000000000 +0200 >+++ cmsg.3 2012-05-28 14:35:39.353690953 +0200 >@@ -154,6 +154,13 @@ > this could be used to declare the size of global > variables. > This may be not portable, however. >+.PP >+The receiver should parse each control message and close every >+file descriptor appropriately; otherwise, the sender can inject >+a file descriptor leak into the receiver. The number of all >+file descriptors passed to the receiver can be computed using the length >+of the message, e.g. int nb_of_descriptors = cmsg->cmsg_len / sizeof (int); >+in the following examples. > .SH EXAMPLE > This code looks for the > .B IP_TTL >@@ -206,8 +213,9 @@ > /* Initialize the payload: */ > fdptr = (int *) CMSG_DATA(cmsg); > memcpy(fdptr, myfds, NUM_FD * sizeof(int)); >-/* Sum of the length of all control messages in the buffer: */ >-msg.msg_controllen = cmsg\->cmsg_len; >+ >+if (sendmsg(s, &msg, 0) == -1) >+ err(1, "sendmsg"); > .fi > .in > .SH "SEE ALSO"
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