FreeCalypso > hg > freecalypso-tools
view rvinterf/etmsync/symlink.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 | e7502631a0f9 |
children |
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/* * Commands for experimenting with FFS symlinks */ #include <sys/types.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "etm.h" #include "ffs.h" #include "tmffs2.h" #include "limits.h" #include "ffslimits.h" #include "localtypes.h" #include "localstruct.h" #include "exitcodes.h" extern u_char rvi_msg[]; extern int rvi_msg_len; do_symlink(target, realobj) char *target, *realobj; { u_char cmdpkt[MAX_PKT_TO_TARGET], *dp; int rc, targlen, reallen; reallen = strlen(realobj); if (reallen >= TMFFS_STRING_SIZE) { printf("error: pathname arg exceeds string length limit\n"); return(ERROR_USAGE); } targlen = strlen(target); if (3 + (reallen+2) + (targlen+2) + 1 > MAX_PKT_TO_TARGET) { printf("error: symlink request fails to fit into packet\n"); return(ERROR_USAGE); } dp = cmdpkt + 1; *dp++ = ETM_FFS2; *dp++ = TMFFS_SYMLINK; *dp++ = reallen + 1; strcpy(dp, realobj); dp += reallen + 1; *dp++ = targlen + 1; strcpy(dp, target); dp += targlen + 1; rc = etm_pkt_exch(cmdpkt, dp - cmdpkt - 1); if (rc) return(rc); if (rvi_msg_len != 5) { printf("error: TMFFS_SYMLINK response has wrong length\n"); return(ERROR_TARGET); } if (rvi_msg[3]) { report_ffs_err("symlink", rvi_msg[3]); return(ERROR_TARGET); } return(0); } cmd_symlink(argc, argv) char **argv; { return do_symlink(argv[1], argv[2]); } do_readlink(pathname, databuf, rdret) char *pathname; u_char *databuf; int *rdret; { u_char cmdpkt[MAX_PKT_TO_TARGET], *dp; int rc, slen, sz; slen = strlen(pathname); if (slen >= TMFFS_STRING_SIZE) { printf("error: pathname arg exceeds string length limit\n"); return(ERROR_USAGE); } dp = cmdpkt + 1; *dp++ = ETM_FFS2; *dp++ = TMFFS_READLINK; *dp++ = slen + 1; strcpy(dp, pathname); dp += slen + 1; *dp++ = 0; /* dummy 2nd buffer */ rc = etm_pkt_exch(cmdpkt, dp - cmdpkt - 1); if (rc) return(rc); if (rvi_msg[3]) { report_ffs_err("readlink", rvi_msg[3]); return(ERROR_TARGET); } if (rvi_msg_len < 6) { *rdret = 0; return(0); } sz = rvi_msg[4]; if (rvi_msg_len != sz + 6) { printf("error: readlink response has wrong length\n"); return(ERROR_TARGET); } bcopy(rvi_msg + 5, databuf, sz); *rdret = sz; return(0); } cmd_readlink(argc, argv) char **argv; { u_char databuf[256]; int rc, sz, off, l; rc = do_readlink(argv[1], databuf, &sz); if (rc) return(rc); printf("%d bytes read\n", sz); for (off = 0; off < sz; off += 16) { l = sz - off; if (l > 16) l = 16; hexdump_line(off, databuf + off, l); } return(0); } do_readlink_sancheck(pathname, databuf) char *pathname; u_char *databuf; { int rc, sz; rc = do_readlink(pathname, databuf, &sz); if (rc) return(rc); if (sz < 2 || databuf[sz-1]) { printf("error: readlink on %s returned garbage\n", pathname); return(ERROR_TARGET); } return(0); }