FreeCalypso > hg > freecalypso-tools
view librftab/readtxramp.c @ 407:19e5a3e2f9c0
fcup-settime: moved time() retrieval a little closer to the output
A fundamental problem with all simple time transfer tools is that there is
always some delay between the time retrieval on the source system and that
transmitted time being set on the destination, and the resulting time
on the destination system is off by that delay amount. This delay cannot
be fully eliminated when working in a simple environment like ours,
but we should make our best effort to minimize it. In the present case,
moving the atinterf_init() call before the time() retrieval should make
a teensy-tiny improvement.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 11 Aug 2018 21:52:17 +0000 |
parents | a0f79bba0ad8 |
children |
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/* * Reading Tx ramp templates from formatted ASCII files, used for the ttw * command in fc-tmsh. */ #include <sys/types.h> #include <ctype.h> #include <stdio.h> #include <string.h> #include <strings.h> #include <stdlib.h> #include "../rvinterf/include/exitcodes.h" #include "rdcommon.c" static u_char *writeptr; static process_txramp_number() { char *field; int rc; u_long number; rc = get_field(&field); if (rc < 0) return(ERROR_USAGE); if (!rc) { printf("error: %s is too short for a Tx ramp template\n", filename); return(ERROR_USAGE); } number = strtoul(field, 0, 0); *writeptr++ = number; return(0); } static read_txramp_16num() { int i, rc; for (i = 0; i < 16; i++) { rc = process_txramp_number(); if (rc) return(rc); } return(0); } read_tx_ramp_template(filename_arg, rdbuf) char *filename_arg; u_char *rdbuf; { char *field; int rc; filename = filename_arg; rdfile = fopen(filename, "r"); if (!rdfile) { perror(filename); return(ERROR_UNIX); } lineno = 0; line_nfields = 0; rc = get_field(&field); if (rc <= 0) { not_valid_ramp_file: printf("error: %s is not a valid Tx ramp template file\n", filename); fclose(rdfile); return(ERROR_USAGE); } if (strcmp(field, "ramp-up")) goto not_valid_ramp_file; writeptr = rdbuf; rc = read_txramp_16num(); if (rc) { fclose(rdfile); return(rc); } rc = get_field(&field); if (rc <= 0) goto not_valid_ramp_file; if (strcmp(field, "ramp-down")) goto not_valid_ramp_file; rc = read_txramp_16num(); if (rc) { fclose(rdfile); return(rc); } rc = get_field(&field); fclose(rdfile); if (rc < 0) return(ERROR_USAGE); if (rc) { printf("error: %s is too long for a Tx ramp template\n", filename); return(ERROR_USAGE); } return(0); }