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958c24b1b8
The server side support; this is just the very low level, and the caller needs to know which band it wants to send things out. Signed-off-by: Junio C Hamano <junkio@cox.net> (cherry picked from b786552b67878c7780c50def4c069d46dc54efbe commit)
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
#include "pkt-line.h"
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#include "sideband.h"
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/*
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* Receive multiplexed output stream over git native protocol.
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* in_stream is the input stream from the remote, which carries data
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* in pkt_line format with band designator. Demultiplex it into out
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* and err and return error appropriately. Band #1 carries the
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* primary payload. Things coming over band #2 is not necessarily
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* error; they are usually informative message on the standard error
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* stream, aka "verbose"). A message over band #3 is a signal that
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* the remote died unexpectedly. A flush() concludes the stream.
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*/
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int recv_sideband(const char *me, int in_stream, int out, int err, char *buf, int bufsz)
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{
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while (1) {
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int len = packet_read_line(in_stream, buf, bufsz);
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if (len == 0)
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break;
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if (len < 1) {
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len = sprintf(buf, "%s: protocol error: no band designator\n", me);
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safe_write(err, buf, len);
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return SIDEBAND_PROTOCOL_ERROR;
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}
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len--;
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switch (buf[0] & 0xFF) {
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case 3:
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safe_write(err, "remote: ", 8);
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safe_write(err, buf+1, len);
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safe_write(err, "\n", 1);
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return SIDEBAND_REMOTE_ERROR;
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case 2:
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safe_write(err, "remote: ", 8);
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safe_write(err, buf+1, len);
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continue;
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case 1:
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safe_write(out, buf+1, len);
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continue;
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default:
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len = sprintf(buf + 1,
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"%s: protocol error: bad band #%d\n",
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me, buf[0] & 0xFF);
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safe_write(err, buf+1, len);
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return SIDEBAND_PROTOCOL_ERROR;
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}
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}
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return 0;
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}
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/*
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* fd is connected to the remote side; send the sideband data
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* over multiplexed packet stream.
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*/
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ssize_t send_sideband(int fd, int band, const char *data, ssize_t sz, int packet_max)
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{
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ssize_t ssz = sz;
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const char *p = data;
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while (sz) {
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unsigned n;
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char hdr[5];
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n = sz;
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if (packet_max - 5 < n)
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n = packet_max - 5;
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sprintf(hdr, "%04x", n + 5);
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hdr[4] = band;
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safe_write(fd, hdr, 5);
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safe_write(fd, p, n);
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p += n;
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sz -= n;
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}
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return ssz;
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}
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