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pg_top.c
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pg_top.c
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char *copyright =
"Copyright (c) 1984 through 2007, William LeFebvre";
/*
* Top users/processes display for Unix
*
* This program may be freely redistributed,
* but this entire comment MUST remain intact.
*
* Copyright (c) 1984, 1989, William LeFebvre, Rice University
* Copyright (c) 1989 - 1994, William LeFebvre, Northwestern University
* Copyright (c) 1994, 1995, William LeFebvre, Argonne National Laboratory
* Copyright (c) 1996, William LeFebvre, Group sys Consulting
* Copyright (c) 2007-2008, Mark Wong
* Portions Copyright (c) 2013 VMware, Inc. All Rights Reserved.
*/
/*
* See the file "HISTORY" for information on version-to-version changes.
*/
/*
* This file contains "main" and other high-level routines.
*/
/*
* The following preprocessor variables, when defined, are used to
* distinguish between different Unix implementations:
*
* FD_SET - macros FD_SET and FD_ZERO are used when defined
*/
#include "os.h"
#include <signal.h>
#include <setjmp.h>
#include <ctype.h>
#include <unistd.h>
#include <getopt.h>
/* determine which type of signal functions to use */
#ifdef HAVE_SIGACTION
#undef HAVE_SIGHOLD
#else
#if !defined(HAVE_SIGHOLD) || !defined(HAVE_SIGRELSE)
#define BSD_SIGNALS
#endif
#endif
/* includes specific to top */
#include "pg_top.h"
#include "machine.h"
#include "remote.h"
#include "commands.h"
#include "display.h" /* interface to display package */
#include "screen.h" /* interface to screen package */
#include "boolean.h"
#include "username.h"
#include "utils.h"
#include "version.h"
#ifdef ENABLE_COLOR
#include "color.h"
#endif
#include "port.h"
/* Size of the stdio buffer given to stdout */
#define Buffersize 2048
/* The buffer that stdio will use */
char stdoutbuf[Buffersize];
/* build signal masks */
#ifndef sigmask
#define sigmask(s) (1 << ((s) - 1))
#endif
/* for getopt: */
extern int optind;
extern char *optarg;
/* imported from screen.c */
extern int overstrike;
/* values which need to be accessed by signal handlers */
static int max_topn; /* maximum displayable processes */
/* miscellaneous things */
char *myname = "top";
jmp_buf jmp_int;
/* internal variables */
static const char *progname = "pg_top";
static void usage(const char *progname);
/* pointers to display routines */
void (*d_loadave) (int, double *) = i_loadave;
void (*d_minibar) (
int (*) (char *, int)) = i_minibar;
void (*d_uptime) (time_t *, time_t *) = i_uptime;
void (*d_procstates) (int, int *) = i_procstates;
void (*d_cpustates) (int64_t *) = i_cpustates;
void (*d_memory) (long *) = i_memory;
void (*d_swap) (long *) = i_swap;
void (*d_db) (struct db_info *) = i_db;
void (*d_io) (struct io_info *) = i_io;
void (*d_disk) (struct disk_info *) = i_disk;
void (*d_message) () = i_message;
void (*d_header) (char *) = i_header;
void (*d_process) (int, char *) = i_process;
/*
* Mode for display cumulutive or differential stats when displaying table or
* index statistics.
*/
int mode_stats = STATS_DIFF;
/*
* Mode for monitoring a remote database system.
*/
int mode_remote = 0;
/*
* usage - print help message with details about commands
*/
static void
usage(const char *progname)
{
printf("%s monitors a PostgreSQL database cluster.\n\n", progname);
printf("Usage:\n");
printf(" %s [OPTION]... [NUMBER]\n", progname);
printf("\nOptions:\n");
printf(" -b, --batch use batch mode\n");
printf(" -c, --show-command display command name of each process\n");
printf(" -C, --color-mode turn off color mode\n");
printf(" -i, --interactive use interactive mode\n");
printf(" -I, --hide-idle hide idle processes\n");
printf(" -n, --non-interactive use non-interactive mode\n");
printf(" -o, --order-field=FIELD select sort order\n");
printf(" -q, --quick-mode modify schedule priority\n");
printf(" usable only by root\n");
printf(" -r, --remote-mode activate remote mode\n");
printf(" -s, --set-delay=SECOND set delay between screen updates\n");
printf(" -T, --show-tags show color tags\n");
printf(" -u, --show-uid show UID instead of username\n");
printf(" -V, --version output version information, then exit\n");
printf(" -x, --set-display=COUNT set maximum number of displays\n");
printf(" exit once this number is reached\n");
printf(" -z, --show-username=NAME display only processes owned by given\n");
printf(" username\n");
printf(" -?, --help show this help, then exit\n");
printf("\nConnection options:\n");
printf(" -d, --dbname=DBNAME database to connect to\n");
printf(" -h, --host=HOSTNAME database server host or socket directory\n");
printf(" -p, --port=PORT database server port\n");
printf(" -U, --username=USERNAME user name to connect as\n");
printf(" -W, --password force password prompt\n");
}
/*
* reset_display() - reset all the display routine pointers so that entire
* screen will get redrawn.
*/
void
reset_display()
{
d_loadave = i_loadave;
d_minibar = i_minibar;
d_uptime = i_uptime;
d_procstates = i_procstates;
d_cpustates = i_cpustates;
d_memory = i_memory;
d_swap = i_swap;
d_db = i_db;
d_io = i_io;
d_disk = i_disk;
d_message = i_message;
d_header = i_header;
d_process = i_process;
}
/*
* signal handlers
*/
void
set_signal(int sig, RETSIGTYPE(*handler) (int))
{
#ifdef HAVE_SIGACTION
struct sigaction action;
action.sa_handler = handler;
action.sa_flags = 0;
(void) sigaction(sig, &action, NULL);
#else
(void) signal(sig, handler);
#endif
}
RETSIGTYPE
leave(int i) /* exit under normal conditions -- INT handler */
{
end_screen();
exit(0);
}
RETSIGTYPE
tstop(int i) /* SIGTSTP handler */
{
#ifdef HAVE_SIGACTION
sigset_t set;
#endif
/* move to the lower left */
end_screen();
fflush(stdout);
/* default the signal handler action */
set_signal(SIGTSTP, SIG_DFL);
/* unblock the TSTP signal */
#ifdef HAVE_SIGACTION
sigemptyset(&set);
sigaddset(&set, SIGTSTP);
sigprocmask(SIG_UNBLOCK, &set, NULL);
#endif
#ifdef HAVE_SIGHOLD
sigrelse(SIGTSTP);
#endif
#ifdef BSD_SIGNALS
(void) sigsetmask(sigblock(0) & ~(sigmask(SIGTSTP)));
#endif
/* send ourselves a TSTP to stop the process */
(void) kill(0, SIGTSTP);
/* reset the signal handler */
set_signal(SIGTSTP, tstop);
/* reinit screen */
reinit_screen();
/* jump to appropriate place */
longjmp(jmp_int, 1);
/* NOTREACHED */
}
#ifdef SIGWINCH
RETSIGTYPE
winch(int i) /* SIGWINCH handler */
{
/* reascertain the screen dimensions */
get_screensize();
/* tell display to resize */
max_topn = display_resize();
#ifndef HAVE_SIGACTION
/* reset the signal handler */
set_signal(SIGWINCH, winch);
#endif
/* jump to appropriate place */
longjmp(jmp_int, 1);
}
#endif
void
quit(int status) /* exit under duress */
{
end_screen();
exit(status);
/* NOTREACHED */
}
RETSIGTYPE
onalrm(int i) /* SIGALRM handler */
{
/* this is only used in batch mode to break out of the pause() */
/* return; */
}
int
main(int argc, char *argv[])
{
register int i;
register int active_procs;
register int change;
/* List of all the options available */
static struct option long_options[] = {
{"batch", no_argument, NULL, 'b'},
{"show-command", no_argument, NULL, 'c'},
{"color-mode", no_argument, NULL, 'C'},
{"interactive", no_argument, NULL, 'i'},
{"hide-idle", no_argument, NULL, 'I'},
{"non-interactive", no_argument, NULL, 'n'},
{"order-field", required_argument, NULL, 'o'},
{"quick-mode", no_argument, NULL, 'q'},
{"remote-mode", no_argument, NULL, 'r'},
{"set-delay", required_argument, NULL, 's'},
{"show-tags", no_argument, NULL, 'T'},
{"show-uid", no_argument, NULL, 'u'},
{"version", no_argument, NULL, 'V'},
{"set-display", required_argument, NULL, 'x'},
{"show-username", required_argument, NULL, 'z'},
{"help", no_argument, NULL, '?'},
{"dbname", required_argument, NULL, 'd'},
{"host", required_argument, NULL, 'h'},
{"port", required_argument, NULL, 'p'},
{"username", required_argument, NULL, 'U'},
{"password", no_argument, NULL, 'W'},
{NULL, 0, NULL, 0}
};
struct system_info system_info;
struct statics statics;
caddr_t processes;
struct db_info db_info;
struct io_info io_info;
struct disk_info disk_info;
static char tempbuf1[50];
static char tempbuf2[50];
#ifdef BSD_SIGNALS
int old_sigmask; /* only used for BSD-style signals */
#endif /* BSD_SIGNALS */
int option_index;
int topn = 0;
int delay = Default_DELAY;
int displays = 0; /* indicates unspecified */
time_t curr_time;
char *(*get_userid) (uid_t) = username;
char *uname_field = "USERNAME";
char *header_text;
char *env_top;
char **preset_argv;
int preset_argc = 0;
char **av;
int ac;
char dostates = No;
char do_unames = Yes;
char interactive = Maybe;
char show_tags = No;
char ch;
char *iptr;
char no_command = 1;
struct timeval timeout;
struct process_select ps;
char *order_name = NULL;
int order_index = 0;
int index_order_index = 0;
int io_order_index = 0;
int table_order_index = 0;
#ifndef FD_SET
/* FD_SET and friends are not present: fake it */
typedef int fd_set;
#define FD_ZERO(x) (*(x) = 0)
#define FD_SET(f, x) (*(x) = 1<<f)
#endif
fd_set readfds;
static struct ext_decl exts = {NULL, NULL};
#ifdef ENABLE_COLOR
int color_on = 1;
#endif
#ifdef HAVE_SIGPROCMASK
sigset_t signalset;
#endif
char conninfo[4096];
char dbname[1024] = "";
char dbusername[1024] = "";
char password[1001] = "";
char socket[1024] = "";
char *password_tmp;
int dbport = 5432;
int mode = MODE_PROCESSES;
char *header_processes;
char header_index_stats[80] =
" I_SCANS I_READS I_FETCHES INDEXRELNAME";
char header_table_stats[80] =
"SEQ_SCANS SEQ_READS I_SCANS I_FETCHES INSERTS UPDATES DELETES RELNAME";
char header_io_stats[80] = " PID RCHAR WCHAR SYSCR SYSCW READS WRITES CWRITES COMMAND";
static char command_chars[] = "\f qh?en#sdkriIucoCNPMTQLERXAt";
/* these defines enumerate the "strchr"s of the commands in command_chars */
#define CMD_redraw 0
#define CMD_update 1
#define CMD_quit 2
#define CMD_help1 3
#define CMD_help2 4
#define CMD_OSLIMIT 4 /* terminals with OS can only handle commands */
#define CMD_errors 5 /* less than or equal to CMD_OSLIMIT */
#define CMD_number1 6
#define CMD_number2 7
#define CMD_delay 8
#define CMD_displays 9
#define CMD_kill 10
#define CMD_renice 11
#define CMD_idletog 12
#define CMD_io 13
#define CMD_user 14
#define CMD_cmdline 15
#define CMD_order 16
#define CMD_color 17
#define CMD_order_pid 18
#define CMD_order_cpu 19
#define CMD_order_mem 20
#define CMD_order_time 21
#define CMD_current_query 22
#define CMD_locks 23
#define CMD_explain 24
#define CMD_tables 25
#define CMD_indexes 26
#define CMD_explain_analyze 27
#define CMD_toggle 28
/* Show help or version number if necessary */
if (argc > 1)
{
if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
{
usage(progname);
exit(0);
}
if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
{
printf("pg_top %s\n", version_string());
exit(0);
}
}
/* set the buffer for stdout */
setbuffer(stdout, stdoutbuf, Buffersize);
/* Get default values from the environment. */
env_top = getenv("PGDATABASE");
if (env_top != NULL)
sprintf(dbname, "dbname=%s", getenv("PGDATABASE"));
env_top = getenv("PGHOST");
if (env_top != NULL)
sprintf(socket, "host=%s", getenv("PGHOST"));
env_top = getenv("PGPORT");
if (env_top != NULL)
dbport = atoi(getenv("PGPORT"));
env_top = getenv("PGUSER");
if (env_top != NULL)
sprintf(dbusername, "user=%s", getenv("PGUSER"));
/* get our name */
if (argc > 0)
{
if ((myname = strrchr(argv[0], '/')) == 0)
{
myname = argv[0];
}
else
{
myname++;
}
}
/* initialize some selection options */
ps.idle = Yes;
ps.fullcmd = Yes;
ps.uid = -1;
ps.command = NULL;
/* get preset options from the environment */
if ((env_top = getenv("PG_TOP")) != NULL)
{
av = preset_argv = argparse(env_top, &preset_argc);
ac = preset_argc;
/*
* set the dummy argument to an explanatory message, in case getopt
* encounters a bad argument
*/
preset_argv[0] = "while processing environment";
}
/* process options */
do
{
/* if we're done doing the presets, then process the real arguments */
if (preset_argc == 0)
{
ac = argc;
av = argv;
/* this should keep getopt happy... */
optind = 1;
}
while ((i = getopt_long(ac, av,
"CDITbcinqruVh:s:d:U:o:Wp:x:z:",
long_options, &option_index)) != EOF)
{
switch (i)
{
#ifdef ENABLE_COLOR
case 'C':
color_on = !color_on;
break;
#endif
case 'D':
debug_set(1);
break;
case 'V': /* show version number */
printf("pg_top %s\n", version_string());
exit(0);
break;
case 'u': /* toggle uid/username display */
do_unames = !do_unames;
break;
case 'z': /* display only username's processes */
if ((ps.uid = userid(optarg)) == -1)
{
fprintf(stderr, "%s: unknown user\n", optarg);
exit(1);
}
break;
case 'I': /* show idle processes */
ps.idle = !ps.idle;
break;
case 'T': /* show color tags */
show_tags = 1;
break;
case 'i': /* go interactive regardless */
interactive = Yes;
break;
case 'c':
ps.fullcmd = No;
break;
case 'n': /* batch, or non-interactive */
case 'b':
interactive = No;
break;
case 'x': /* number of displays to show */
if ((i = atoiwi(optarg)) == Invalid || i == 0)
{
new_message(MT_standout | MT_delayed,
" Bad display count (ignored)");
}
else
{
displays = i;
}
break;
case 's':
if ((delay = atoi(optarg)) < 0 ||
(delay == 0 && getuid() != 0))
{
new_message(MT_standout | MT_delayed,
" Bad seconds delay (ignored)");
delay = Default_DELAY;
}
break;
case 'q': /* be quick about it */
/* only allow this if user is really root */
if (getuid() == 0)
{
/* be very un-nice! */
(void) nice(-20);
}
else
{
new_message(MT_standout | MT_delayed,
" Option -q can only be used by root");
}
break;
case 'o': /* select sort order */
order_name = optarg;
break;
case 'p': /* database port */
if ((i = atoiwi(optarg)) == Invalid || i == 0)
{
new_message(MT_standout | MT_delayed,
" Bad port number (ignored)");
}
else
{
dbport = i;
}
break;
case 'W': /* prompt for database password */
password_tmp = simple_prompt("Password: ", 1000, 0);
/*
* get the password in the format we want for the connect
* string
*/
sprintf(password, "password=%s", password_tmp);
break;
case 'U': /* database user name */
sprintf(dbusername, "user=%s", optarg);
break;
case 'd': /* database name */
sprintf(dbname, "dbname=%s", optarg);
break;
case 'h': /* socket location */
sprintf(socket, "host=%s", optarg);
break;
case 'r': /* remote mode */
mode_remote = 1;
break;
default:
fprintf(stderr, "Try \"%s --help\" for more information.\n", progname);
exit(1);
}
}
/* connect to the database */
sprintf(conninfo, "port=%d %s %s %s %s",
dbport, dbname, socket, dbusername, password);
/* get count of top processes to display (if any) */
if (optind < ac && *av[optind])
{
if ((i = atoiwi(av[optind])) == Invalid)
{
new_message(MT_standout | MT_delayed,
" Process count not a number (ignored)");
}
else
{
topn = i;
}
}
/* tricky: remember old value of preset_argc & set preset_argc = 0 */
i = preset_argc;
preset_argc = 0;
/* repeat only if we really did the preset arguments */
} while (i != 0);
/* set constants for username/uid display correctly */
if (!do_unames)
{
uname_field = " UID ";
get_userid = itoa7;
}
/*
* in order to support forward compatability, we have to ensure that the
* entire statics structure is set to a known value before we call
* machine_init. This way fields that a module does not know about will
* retain their default values
*/
memzero((void *) &statics, sizeof(statics));
statics.boottime = -1;
#ifdef ENABLE_COLOR
/* If colour has been turned on read in the settings. */
env_top = getenv("PG_TOPCOLOURS");
if (!env_top)
{
env_top = getenv("PG_TOPCOLORS");
}
/* must do something about error messages */
color_env_parse(env_top);
#endif
/* call the platform-specific init */
if (mode_remote == 0)
i = machine_init(&statics);
else
i = machine_init_r(&statics, conninfo);
if (i == -1)
exit(1);
/* determine sorting order index, if necessary */
if (order_name != NULL)
{
if (statics.order_names == NULL)
{
new_message(MT_standout | MT_delayed,
" This platform does not support arbitrary ordering");
}
else if ((order_index = string_index(order_name,
statics.order_names)) == -1)
{
char **pp;
fprintf(stderr, "%s: '%s' is not a recognized sorting order.\n",
myname, order_name);
fprintf(stderr, "\tTry one of these:");
pp = statics.order_names;
while (*pp != NULL)
{
fprintf(stderr, " %s", *pp++);
}
fputc('\n', stderr);
exit(1);
}
}
#ifdef WITH_EXT
/* initialize extensions */
init_ext(&exts);
#endif
/* initialize termcap */
init_termcap(interactive);
/* get the string to use for the process area header */
if (mode_remote == 0)
header_text = header_processes = format_header(uname_field);
else
header_text = header_processes = format_header_r(uname_field);
#ifdef ENABLE_COLOR
/* Disable colours on non-smart terminals */
if (!smart_terminal)
{
color_on = 0;
}
#endif
/* initialize display interface */
if ((max_topn = display_init(&statics)) == -1)
{
fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
exit(4);
}
/* handle request for color tags */
if (show_tags)
{
color_dump(stdout);
exit(0);
}
/*
* Set topn based on the current screensize when starting up if it was not
* specified on the command line.
*/
if (topn == 0)
{
get_screensize();
topn = display_resize();
}
/* print warning if user requested more processes than we can display */
if (topn > max_topn)
{
new_message(MT_standout | MT_delayed,
" This terminal can only display %d processes.",
max_topn);
}
/* set header display accordingly */
display_header(topn > 0);
/* determine interactive state */
if (interactive == Maybe)
{
interactive = smart_terminal;
}
/* if # of displays not specified, fill it in */
if (displays == 0)
{
displays = smart_terminal ? Infinity : 1;
}
/* hold interrupt signals while setting up the screen and the handlers */
#ifdef HAVE_SIGPROCMASK
sigemptyset(&signalset);
sigaddset(&signalset, SIGINT);
sigaddset(&signalset, SIGQUIT);
sigaddset(&signalset, SIGTSTP);
#ifdef SIGWINCH
sigaddset(&signalset, SIGWINCH);
#endif
sigprocmask(SIG_BLOCK, &signalset, NULL);
#endif
#ifdef HAVE_SIGHOLD
sighold(SIGINT);
sighold(SIGQUIT);
sighold(SIGTSTP);
#ifdef SIGWINCH
sighold(SIGWINCH);
#endif
#endif
#ifdef BSD_SIGNALS
#ifdef SIGWINCH
old_sigmask = sigblock(sigmask(SIGINT) | sigmask(SIGQUIT) |
sigmask(SIGTSTP) | sigmask(SIGWINCH));
#else
old_sigmask = sigblock(sigmask(SIGINT) | sigmask(SIGQUIT) |
sigmask(SIGTSTP));
#endif
#endif
init_screen();
(void) set_signal(SIGINT, leave);
(void) set_signal(SIGQUIT, leave);
(void) set_signal(SIGTSTP, tstop);
#ifdef SIGWINCH
(void) set_signal(SIGWINCH, winch);
#endif
/* setup the jump buffer for stops */
if (setjmp(jmp_int) != 0)
{
/* control ends up here after an interrupt */
reset_display();
}
/*
* Ready to release the signals. This will also happen (needlessly) after
* a longjmp, but that's okay.
*/
#ifdef HAVE_SIGPROCMASK
sigprocmask(SIG_UNBLOCK, &signalset, NULL);
#endif
#ifdef HAVE_SIGHOLD
sigrelse(SIGINT);
sigrelse(SIGQUIT);
sigrelse(SIGTSTP);
#ifdef SIGWINCH
sigrelse(SIGWINCH);
#endif
#endif
#ifdef BSD_SIGNALS
(void) sigsetmask(old_sigmask);
#endif
/* some systems require a warmup */
if (statics.flags.warmup)
{
if (mode_remote == 0)
{
get_system_info(&system_info);
#ifdef __linux__
(void) get_process_info(&system_info, &ps, 0, conninfo, mode);
#else
(void) get_process_info(&system_info, &ps, 0, conninfo);
#endif /* __linux__ */
}
else
{
get_system_info_r(&system_info, conninfo);
(void) get_process_info_r(&system_info, &ps, 0, conninfo);
}
/* Get database activity information */
get_database_info(&db_info, conninfo);
/* Get database I/O information */
get_io_info(&io_info);
/* Get database disk information */
get_disk_info(&disk_info, get_data_directory(conninfo));
timeout.tv_sec = 1;
timeout.tv_usec = 0;
select(0, NULL, NULL, NULL, &timeout);
/* if we've warmed up, then we can show good states too */
dostates = Yes;
}
/*
* main loop -- repeat while display count is positive or while it
* indicates infinity (by being -1)
*/
while ((displays == -1) || (displays-- > 0))
{
int tmp_index = 0;
switch (mode) {
case MODE_IO_STATS:
tmp_index = io_order_index;
break;
default:
tmp_index = 0;
}
/* get the current stats and processes */
if (mode_remote == 0)
{
get_system_info(&system_info);
#ifdef __linux__
processes = get_process_info(&system_info, &ps, tmp_index,
conninfo, mode);
#else
processes = get_process_info(&system_info, &ps, tmp_index,
conninfo);
#endif /* __linux__ */
}
else
{
get_system_info_r(&system_info, conninfo);
processes = get_process_info_r(&system_info, &ps, order_index,
conninfo);
}
/* Get database activity information */
get_database_info(&db_info, conninfo);
/* Get database I/O information */
get_io_info(&io_info);
/* display database disk info */
get_disk_info(&disk_info, get_data_directory(conninfo));
/* display the load averages */
(*d_loadave) (system_info.last_pid,
system_info.load_avg);
/* this method of getting the time SHOULD be fairly portable */
time(&curr_time);
/* if we have a minibar extension, use it, otherwise show uptime */
if (exts.f_minibar != NULL)
{
(*d_minibar) (exts.f_minibar);
}
else
{
(*d_uptime) (&statics.boottime, &curr_time);
}
/* display the current time */
i_timeofday(&curr_time);
/* display process state breakdown */
(*d_procstates) (system_info.p_total,
system_info.procstates);
/* display the cpu state percentage breakdown */
if (dostates) /* but not the first time */
{
(*d_cpustates) (system_info.cpustates);
}
else
{
/* we'll do it next time */
if (smart_terminal)
{
z_cpustates();
}
dostates = Yes;
}
/* display memory stats */
(*d_memory) (system_info.memory);
/* display database activity */
(*d_db) (&db_info);
/* display database I/O */