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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:41:07 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:41:07 +0000 |
commit | 3af6d22bb3850ab2bac67287e3a3d3b0e32868e5 (patch) | |
tree | 3ee7a3ec64525911fa865bb984c86d997d855527 /man3/cmsg.3 | |
parent | Adding debian version 6.05.01-1. (diff) | |
download | manpages-3af6d22bb3850ab2bac67287e3a3d3b0e32868e5.tar.xz manpages-3af6d22bb3850ab2bac67287e3a3d3b0e32868e5.zip |
Merging upstream version 6.7.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man3/cmsg.3')
-rw-r--r-- | man3/cmsg.3 | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/man3/cmsg.3 b/man3/cmsg.3 index 3ca7d1d..2d0a70e 100644 --- a/man3/cmsg.3 +++ b/man3/cmsg.3 @@ -3,7 +3,7 @@ .\" This man page is Copyright (C) 1999 Andi Kleen <ak@muc.de>. .\" .\" $Id: cmsg.3,v 1.8 2000/12/20 18:10:31 ak Exp $ -.TH CMSG 3 2023-07-15 "Linux man-pages 6.05.01" +.TH CMSG 3 2023-10-31 "Linux man-pages 6.7" .SH NAME CMSG_ALIGN, CMSG_SPACE, CMSG_NXTHDR, CMSG_FIRSTHDR \- access ancillary data .SH LIBRARY @@ -12,7 +12,7 @@ Standard C library .SH SYNOPSIS .nf .B #include <sys/socket.h> -.PP +.P .BI "struct cmsghdr *CMSG_FIRSTHDR(struct msghdr *" msgh ); .BI "struct cmsghdr *CMSG_NXTHDR(struct msghdr *" msgh , .BR " struct cmsghdr *" cmsg ); @@ -35,7 +35,7 @@ Ancillary data is sent by calling and received by calling .BR recvmsg (2). See their manual pages for more information. -.PP +.P Ancillary data is a sequence of .I cmsghdr structures with appended data. @@ -44,11 +44,11 @@ The maximum ancillary buffer size allowed per socket can be set using .IR /proc/sys/net/core/optmem_max ; see .BR socket (7). -.PP +.P The .I cmsghdr structure is defined as follows: -.PP +.P .in +4n .EX struct cmsghdr { @@ -61,7 +61,7 @@ struct cmsghdr { }; .EE .in -.PP +.P The sequence of .I cmsghdr structures should never be accessed directly. @@ -122,7 +122,7 @@ alignment. It takes the data length as an argument. This is a constant expression. -.PP +.P To create ancillary data, first initialize the .I msg_controllen member of the @@ -158,7 +158,7 @@ see .SH VERSIONS For portability, ancillary data should be accessed using only the macros described here. -.PP +.P In Linux, .BR CMSG_LEN (), .BR CMSG_DATA (), @@ -185,7 +185,7 @@ Linux. .SH HISTORY This ancillary data model conforms to the POSIX.1g draft, 4.4BSD-Lite, the IPv6 advanced API described in RFC\ 2292 and SUSv2. -.PP +.P .BR CMSG_SPACE () and .BR CMSG_LEN () @@ -195,7 +195,7 @@ will be included in the next POSIX release (Issue 8). This code looks for the .B IP_TTL option in a received ancillary buffer: -.PP +.P .in +4n .EX struct msghdr msgh; @@ -218,11 +218,11 @@ if (cmsg == NULL) { } .EE .in -.PP +.P The code below passes an array of file descriptors over a UNIX domain socket using .BR SCM_RIGHTS : -.PP +.P .in +4n .EX struct msghdr msg = { 0 }; @@ -250,12 +250,12 @@ cmsg\->cmsg_len = CMSG_LEN(sizeof(myfds)); memcpy(CMSG_DATA(cmsg), myfds, sizeof(myfds)); .EE .in -.PP +.P For a complete code example that shows passing of file descriptors over a UNIX domain socket, see .BR seccomp_unotify (2). .SH SEE ALSO .BR recvmsg (2), .BR sendmsg (2) -.PP +.P RFC\ 2292 |