FreeCalypso > hg > freecalypso-tools
view loadtools/tpinterf2.c @ 619:f82551c77e58
libserial-newlnx: ASYNC_LOW_LATENCY patch reverted
Reports from Das Signal indicate that loadtools performance on Debian
is about the same as on Slackware, and that including or omitting the
ASYNC_LOW_LATENCY patch from Serg makes no difference. Because the
patch in question does not appear to be necessary, it is being reverted
until and unless someone other than Serg reports an actual real-world
system on which loadtools operation times are slowed compared to the
Mother's Slackware reference and on which Slackware-like performance
can be restored by setting the ASYNC_LOW_LATENCY flag.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Thu, 27 Feb 2020 01:09:48 +0000 |
parents | e7502631a0f9 |
children | 8d7dcfd9df53 |
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/* * This module provides a more advanced target interface function * than tpinterf.c - programmatic capture of target responses, * for dumps etc. It will be linked by fc-loadtool, but not fc-chainload. */ #include <sys/types.h> #include <sys/time.h> #include <sys/errno.h> #include <stdio.h> #include <string.h> #include <strings.h> #include <stdlib.h> extern int errno; extern int target_fd; /* * This functions reads the serial output from the target until a * '=' prompt is received. All intermediate output is parsed into * lines and passed to a callback function. * * The callback function is called with a pointer to each received * line, stored in a buffer ending in NUL, with CRLF stripped. * The callback function is expected to return an int. If the * callback return value is negative, this function returns immediately * with that negative value. If the callback return value is positive * or zero, it is added to an accumulator. * * Termination: this function returns when it has received a '=' at * the beginning of a line (return value is the callback return * accumulator, or 0 if no lines came), if the callback returns a * negative value (that value is returned), or if an error is detected * within this function (return value -1, and an error message * printed on stderr). */ tpinterf_capture_output(timeout, callback) int timeout; /* seconds */ int (*callback)(); { char buf[512], *cp; char line[1024], *dp = line; fd_set fds; struct timeval tv; int cc, linelen = 0; int totout = 0, cbret; for (;;) { FD_ZERO(&fds); FD_SET(target_fd, &fds); tv.tv_sec = timeout; tv.tv_usec = 0; cc = select(target_fd+1, &fds, NULL, NULL, &tv); if (cc < 0) { if (errno == EINTR) continue; perror("select"); return(-1); } if (cc < 1) { fprintf(stderr, "error: timeout waiting for \'=\' prompt from target\n"); return(-1); } cc = read(target_fd, buf, sizeof buf); if (cc <= 0) { perror("read after successful select"); return(-1); } for (cp = buf; cc; cp++) { cc--; if (*cp == '=' && !linelen && !cc) return(totout); if (*cp == '\r') continue; if (*cp == '\n') { *dp = '\0'; cbret = callback(line); if (cbret < 0) return(cbret); totout += cbret; dp = line; linelen = 0; continue; } *dp++ = *cp; linelen++; if (linelen >= sizeof line) { fprintf(stderr, "error: target response line length exceeds buffer\n"); return(-1); } } } } /* single line response capture mechanism */ /* same line buffer size as in tpinterf_capture_output() */ char target_response_line[1024]; static oneline_catcher(linein) char *linein; { strcpy(target_response_line, linein); return(1); } tpinterf_capture_output_oneline(timeout) { return tpinterf_capture_output(timeout, oneline_catcher); }