ref: e3f72faa42528a76d3c77081bb0bf11a6ea4efa5
dir: /test/freplay.c/
#include <u.h> #include <libc.h> #include <fcall.h> #include <thread.h> #include <9p.h> File* ctlfile; File* datfile; char* mountpt = "/n/replay"; char* srvname = "replay"; char* logfile; char* replayfile; char* membuf; vlong membufsz; vlong replaycount = -1; int logfd = -1; int replayfd = -1; vlong nwrites; void log1(int fd, void *buf, vlong off, vlong sz) { char *p, hdr[12]; p = hdr; PBIT64(p, off); p += 8; PBIT32(p, sz); if(write(fd, hdr, sizeof(hdr)) == -1) sysfatal("write header: %r"); if(write(fd, buf, sz) == -1) sysfatal("write data: %r\n"); } int replay1(int fd) { uchar *p, hdr[12]; vlong o; int n, r; r = readn(fd, hdr, 12); if(r == 0) return 0; if(r != 12) sysfatal("failed to read operation header: %r"); p = hdr; o = GBIT64(p); p += 8; n = GBIT32(p); if(o + n > membufsz) sysfatal("operation exceeds buffer size"); if(readn(fd, membuf + o, n) != n) sysfatal("read op: %r"); nwrites++; return 1; } void fsread(Req *r) { char buf[128]; if(r->fid->file == datfile){ readbuf(r, membuf, membufsz); respond(r, nil); }else if(r->fid->file == ctlfile){ snprint(buf, sizeof(buf), "writes %lld\n", nwrites); readstr(r, buf); respond(r, nil); }else abort(); } void fswrite(Req *r) { if(r->fid->file == datfile){ if(logfile == nil) respond(r, "read-only replay file: no log defined"); if(r->ifcall.offset + r->ifcall.count >= membufsz) respond(r, "operation exceeds file size"); log1(logfd, r->ifcall.data, r->ifcall.offset, r->ifcall.count); memcpy(membuf + r->ifcall.offset, r->ifcall.data, r->ifcall.count); r->ofcall.count = r->ifcall.count; respond(r, nil); nwrites++; }else if(r->fid->file == ctlfile){ if(strncmp(r->ifcall.data, "exit", 4) == 0){ print("exiting...\n"); r->ofcall.count = r->ifcall.count; respond(r, nil); exits(nil); }else if(strncmp(r->ifcall.data, "step", 4) == 0){ r->ofcall.count = r->ifcall.count; if(replayfd == -1) respond(r, "no active replay"); else if(!replay1(replayfd)) respond(r, "no replay left"); else respond(r, nil); }else respond(r, "unknown ctl message"); }else abort(); } void usage(void) { fprint(2, "usage: %s [-l log] [-r replay] [-c count] file\n", argv0); exits("usage"); } static Srv fs = { .read = fsread, .write = fswrite, }; void main(int argc, char *argv[]) { int fd; vlong n, off; char *uid; Dir *d; int i; ARGBEGIN{ case 'd': chatty9p++; break; case 'l': logfile = EARGF(usage()); break; case 'r': replayfile = EARGF(usage()); break; case 'c': replaycount = atoi(EARGF(usage())); break; case 'm': mountpt = EARGF(usage()); break; case 's': srvname = EARGF(usage()); break; default: usage(); }ARGEND; if(argc != 1) usage(); if((fd = open(argv[0], OREAD)) == -1) sysfatal("open %s: %r", argv[0]); if((d = dirfstat(fd)) == nil) sysfatal("failed to stat file: %r"); if((membuf = sbrk(d->length)) == nil) sysfatal("failed to allocate buffer: %r"); memset(membuf, 0, d->length); for(off = 0; off < d->length; off += n) if((n = read(fd, membuf+off, d->length - off)) <= 0) sysfatal("read %s: short read", argv[0]); membufsz = d->length; free(d); if(replayfile != nil){ if((replayfd = open(replayfile, OREAD)) == -1) sysfatal("failed to open replay file: %r"); for(i = 0; i < replaycount || replaycount == -1; i++) if(replay1(replayfd) == 0) break; print("replayed %d ops\n", i); } if(logfile != nil){ if((logfd = create(logfile, OWRITE, 0666)) == -1) sysfatal("failed to open log file: %r"); } uid = getuser(); fs.tree = alloctree(uid, uid, DMDIR|0555, nil); ctlfile = createfile(fs.tree->root, "ctl", uid, 0666, nil); datfile = createfile(fs.tree->root, "data", uid, 0666, nil); datfile->length = membufsz; postmountsrv(&fs, srvname, mountpt, MREPL); exits(nil); }