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1 | .\" -*-nroff-*- |
| 2 | .TH fdpass 3 "28 November 2003" "Straylight/Edgeware" "mLib utilities library" |
| 3 | .SH NAME |
| 4 | fdpass \- file descriptor passing |
| 5 | .\" @fdpass_send |
| 6 | .\" @fdpass_recv |
| 7 | .SH SYNOPSIS |
| 8 | .nf |
| 9 | .B "#include <mLib/fdpass.h>" |
| 10 | |
| 11 | .BI "ssize_t fdpass_send(int " sock ", int " fd ", const void *" p ", size_t " sz ); |
| 12 | .BI "ssize_t fdpass_recv(int " sock ", int *" fd ", void *" p ", size_t " sz ); |
| 13 | .fi |
| 14 | .SH DESCRIPTION |
| 15 | The function |
| 16 | .B fdpass_send |
| 17 | sends the file descriptor |
| 18 | .I fd |
| 19 | as ancillary data attached to the buffer pointed to by |
| 20 | .I p |
| 21 | of length |
| 22 | .I sz |
| 23 | over the Unix-domain socket |
| 24 | .IR sock . |
| 25 | It returns the amount of data sent, or \-1 on error. For more details, |
| 26 | see |
| 27 | .BR sendmsg (2) |
| 28 | and |
| 29 | .BR unix (7). |
| 30 | .PP |
| 31 | The function |
| 32 | .B fdpass_recv |
| 33 | receives at most |
| 34 | .I sz |
| 35 | bytes of data into the buffer pointed to by |
| 36 | .IR p , |
| 37 | together with at most one file descriptor passed as ancillary data, |
| 38 | which is written to the integer pointed to by |
| 39 | .IR fd . |
| 40 | Other file descriptors received are closed; any other ancillary messages |
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41 | are ignored. If no file descriptor is received, |
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42 | .BI * fd |
| 43 | is set to \-1. The function returns the number of bytes read, or \-1 on |
| 44 | error. For more details, see |
| 45 | .BR recvmsg (2) |
| 46 | and |
| 47 | .BR unix (7). |
| 48 | .SH "SEE ALSO" |
| 49 | .BR recvmsg (2), |
| 50 | .BR sendmsg (2), |
| 51 | .BR mLib (3), |
| 52 | .BR unix (7). |
| 53 | .SH AUTHOR |
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54 | Mark Wooding, <mdw@distorted.org.uk> |
~mdw / mLib / blame