diff options
Diffstat (limited to 'db2/progs/db_deadlock/db_deadlock.c')
| -rw-r--r-- | db2/progs/db_deadlock/db_deadlock.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/db2/progs/db_deadlock/db_deadlock.c b/db2/progs/db_deadlock/db_deadlock.c new file mode 100644 index 0000000000..9437e3552d --- /dev/null +++ b/db2/progs/db_deadlock/db_deadlock.c @@ -0,0 +1,236 @@ +/*- + * See the file LICENSE for redistribution information. + * + * Copyright (c) 1996, 1997 + * Sleepycat Software. All rights reserved. + */ + +#include "config.h" + +#ifndef lint +static const char copyright[] = +"@(#) Copyright (c) 1997\n\ + Sleepycat Software Inc. All rights reserved.\n"; +static const char sccsid[] = "@(#)db_deadlock.c 10.13 (Sleepycat) 7/20/97"; +#endif + +#ifndef NO_SYSTEM_INCLUDES +#include <sys/types.h> + +#include <errno.h> +#include <limits.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <time.h> +#include <unistd.h> +#endif + +#include "db_int.h" +#include "clib_ext.h" +#include "common_ext.h" + +#define BAD_KILLID 0xffffffff + +DB_ENV *db_init __P((char *, int)); +void onint __P((int)); +void siginit __P((void)); +void usage __P((void)); +int logpid __P((char *, int)); +int main __P((int, char *[])); + +int interrupted; +const char *progname = "db_deadlock"; /* Program name. */ + +int +main(argc, argv) + int argc; + char *argv[]; +{ + extern char *optarg; + extern int optind; + DB_ENV *dbenv; + u_int32_t atype; + time_t now; + long seconds; + int ch, flags, verbose; + char *home, *logfile; + + atype = DB_LOCK_DEFAULT; + home = logfile = NULL; + seconds = 0; + flags = verbose = 0; + while ((ch = getopt(argc, argv, "a:h:L:t:vw")) != EOF) + switch (ch) { + case 'a': + switch (optarg[0]) { + case 'o': + atype = DB_LOCK_OLDEST; + break; + case 'y': + atype = DB_LOCK_YOUNGEST; + break; + default: + usage(); + /* NOTREACHED */ + } + if (optarg[1] != '\0') + usage(); + break; + case 'h': + home = optarg; + break; + case 'L': + logfile = optarg; + break; + case 't': + get_long(optarg, 1, LONG_MAX, &seconds); + break; + case 'v': + verbose = 1; + break; + case 'w': + LF_SET(DB_LOCK_CONFLICT); + break; + case '?': + default: + usage(); + } + argc -= optind; + argv += optind; + + if (argc != 0) + usage(); + + if (seconds == 0 && !LF_ISSET(DB_LOCK_CONFLICT)) { + warnx("at least one of -t and -w must be specified"); + usage(); + } + + /* + * We detect every second when we're running in DB_LOCK_CONFLICT mode. + */ + if (seconds == 0) + seconds = 1; + + /* Initialize the deadlock detector by opening the lock manager. */ + dbenv = db_init(home, verbose); + + if (logfile != NULL && logpid(logfile, 1)) { + (void)db_appexit(dbenv); + return (1); + } + + while (!interrupted) { + if (dbenv->db_verbose != 0) { + time(&now); + __db_err(dbenv, "Running at %s", ctime(&now)); + } + + if ((errno = lock_detect(dbenv->lk_info, flags, atype)) != 0) + break; + + /* Make a pass every "seconds" seconds. */ + (void)__db_sleep(seconds, 0); + } + + if (logfile != NULL) + (void)logpid(logfile, 0); + + if (interrupted) { + (void)signal(interrupted, SIG_DFL); + (void)raise(interrupted); + /* NOTREACHED */ + } + + return (db_appexit(dbenv)); +} + +DB_ENV * +db_init(home, verbose) + char *home; + int verbose; +{ + DB_ENV *dbenv; + + if ((dbenv = (DB_ENV *)calloc(sizeof(DB_ENV), 1)) == NULL) { + errno = ENOMEM; + err(1, NULL); + } + dbenv->db_errfile = stderr; + dbenv->db_errpfx = progname; + dbenv->db_verbose = verbose; + + if ((errno = db_appinit(home, + NULL, dbenv, DB_INIT_LOCK | DB_USE_ENVIRON)) != 0) + err(1, "db_appinit"); + + siginit(); + + return (dbenv); +} + +/* + * logpid -- + * Log that we're running. + */ +int +logpid(fname, is_open) + char *fname; + int is_open; +{ + FILE *fp; + time_t now; + + if (is_open) { + if ((fp = fopen(fname, "w")) == NULL) { + warn("%s", fname); + return (1); + } + (void)time(&now); + fprintf(fp, + "%s: %lu %s", progname, (u_long)getpid(), ctime(&now)); + fclose(fp); + } else + (void)remove(fname); + return (0); +} + +/* + * siginit -- + * Initialize the set of signals for which we want to clean up. + * Generally, we try not to leave the shared regions locked if + * we can. + */ +void +siginit() +{ +#ifdef SIGHUP + (void)signal(SIGHUP, onint); +#endif + (void)signal(SIGINT, onint); +#ifdef SIGKILL + (void)signal(SIGKILL, onint); +#endif + (void)signal(SIGTERM, onint); +} + +/* + * oninit -- + * Interrupt signal handler. + */ +void +onint(signo) + int signo; +{ + if ((interrupted = signo) == 0) + interrupted = SIGINT; +} + +void +usage() +{ + (void)fprintf(stderr, + "usage: db_deadlock [-vw] [-a m | o | y] [-h home] [-L file] [-t sec]\n"); + exit(1); +} |