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4ef46028d8
procps/oldtop.c
albert af89241571 coding style
2002-10-09 21:32:33 +00:00

1810 lines
47 KiB
C
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/*
* top.c - show top CPU processes
*
* Copyright (c) 1992 Branko Lankester
* Copyright (c) 1992 Roger Binns
* Copyright (c) 1997 Michael K. Johnson
*
* Snarfed and HEAVILY modified in december 1992 for procps
* by Michael K. Johnson, johnsonm@sunsite.unc.edu.
*
* Modified Michael K. Johnson's ps to make it a top program.
* Also borrowed elements of Roger Binns kmem based top program.
* Changes made by Robert J. Nation (nation@rocket.sanders.lockheed.com)
* 1/93
*
* Modified by Michael K. Johnson to be more efficient in cpu use
* 2/21/93
*
* Changed top line to use uptime for the load average. Also
* added SIGTSTP handling. J. Cowley, 19 Mar 1993.
*
* Modified quite a bit by Michael Shields (mjshield@nyx.cs.du.edu)
* 1994/04/02. Secure mode added. "d" option added. Argument parsing
* improved. Switched order of tick display to user, system, nice, idle,
* because it makes more sense that way. Style regularized (to K&R,
* more or less). Cleaned up much throughout. Added cumulative mode.
* Help screen improved.
*
* Fixed kill buglet brought to my attention by Rob Hooft.
* Problem was mixing of stdio and read()/write(). Added
* getnum() to solve problem.
* 12/30/93 Michael K. Johnson
*
* Added toggling output of idle processes via 'i' key.
* 3/29/94 Gregory K. Nickonov
*
* Fixed buglet where rawmode wasn't getting restored.
* Added defaults for signal to send and nice value to use.
* 5/4/94 Jon Tombs.
*
* Modified 1994/04/25 Michael Shields <mjshield@nyx.cs.du.edu>
* Merged previous changes to 0.8 into 0.95.
* Allowed the use of symbolic names (e.g., "HUP") for signal input.
* Rewrote getnum() into getstr(), getint(), getsig(), etc.
*
* Modified 1995 Helmut Geyer <Helmut.Geyer@iwr.uni-heidelberg.de>
* added kmem top functionality (configurable fields)
* configurable order of process display
* Added options for dis/enabling uptime, statistics, and memory info.
* fixed minor bugs for ELF systems (e.g. SIZE, RSS fields)
*
* Modified 1996/05/18 Helmut Geyer <Helmut.Geyer@iwr.uni-heidelberg.de>
* Use of new interface and general cleanup. The code should be far more
* readable than before.
*
* Modified 1996/06/25 Zygo Blaxell <zblaxell@ultratech.net>
* Added field scaling code for programs that run more than two hours or
* take up more than 100 megs. We have lots of both on our production line.
*
* Modified 1998/02/21 Kirk Bauer <kirk@kaybee.org>
* Added the 'u' option to display only a selected user... plus it will
* take into account that not all 20 top processes are actually shown,
* so it can fit more onto the screen. I think this may help the
* 'don't show idle' mode, but I'm not sure.
*
* Modified 1997/07/27 & 1999/01/27 Tim Janik <timj@gtk.org>
* added `-p' option to display specific process ids.
* process sorting is by default disabled in this case.
* added `N' and `A' keys to sort the tasks Numerically by pid or
* sort them by Age (newest first).
*
* Modified 1999/10/22 Tim Janik <timj@gtk.org>
* miscellaneous minor fixes, including "usage: ..." output for
* unrecognized options.
*
* Modified 2000/02/07 Jakub Jelinek <jakub@redhat.com>
* Only load System.map when we are going to display WCHAN.
* Show possible error messages from that load using SHOWMESSAGE.
*
* Modified 2000/07/10 Michael K. Johnson <johnsonm@redhat.com>
* Integrated a patch to display SMP information.
*/
#include <errno.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <libintl.h>
#include <time.h>
#include <sys/ioctl.h>
#include <pwd.h>
#include <termcap.h>
#include <termios.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <ctype.h>
#include <setjmp.h>
#include <stdarg.h>
#include <sys/param.h>
#include <locale.h>
#include "proc/sysinfo.h"
#include "proc/procps.h"
#include "proc/whattime.h"
#include "proc/sig.h"
#include "proc/version.h"
#include "proc/readproc.h"
#include "proc/status.h"
#include "proc/devname.h"
#include "proc/compare.h"
#define PUTP(x) (tputs(x,1,putchar))
#define BAD_INPUT -30
#include "top.h" /* new header for top specific things */
static int *cpu_mapping;
/*#######################################################################
*#### Startup routines: parse_options, get_options, ##############
*#### setup_terminal and main ##############
*#######################################################################
*/
/*
* parse the options string as read from the config file(s).
* if top is in secure mode, disallow changing of the delay time between
* screen updates.
*/
static void parse_options(char *Options, int secure)
{
int i;
for (i = 0; i < strlen(Options); i++) {
switch (Options[i]) {
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (!secure)
Sleeptime = (float) Options[i] - '0';
break;
case 'S':
Cumulative = 1;
headers[22][1] = 'C';
break;
case 's':
Secure = 1;
break;
case 'i':
Noidle = 1;
break;
case 'm':
show_memory = 0;
header_lines -= 2;
break;
case 'M':
sort_type = S_MEM;
reset_sort_options();
register_sort_function( -1, (cmp_t)mem_sort);
break;
case 'l':
show_loadav = 0;
header_lines -= 1;
break;
case 'P':
sort_type = S_PCPU;
reset_sort_options();
register_sort_function( -1, (cmp_t)pcpu_sort);
break;
case 'N':
sort_type = S_NONE;
reset_sort_options();
break;
case 'A':
sort_type = S_AGE;
reset_sort_options();
register_sort_function( -1, (cmp_t)age_sort);
break;
case 't':
show_stats = 0;
header_lines -= 2;
break;
case 'T':
sort_type = S_TIME;
reset_sort_options();
register_sort_function( -1, (cmp_t)time_sort);
break;
case 'c':
show_cmd = 0;
break;
case '\n':
break;
case 'I':
Irixmode = 0;
break;
default:
fprintf(stderr, "Wrong configuration option %c\n", i);
exit(1);
break;
}
}
}
/*
* Read the configuration file(s). There are two files, once SYS_TOPRC
* which should only contain the secure switch and a sleeptime
* value iff ordinary users are to use top in secure mode only.
*
* The other file is $HOME/RCFILE.
* The configuration file should contain two lines (any of which may be
* empty). The first line specifies the fields that are to be displayed
* in the order you want them to. Uppercase letters specify fields
* displayed by default, lowercase letters specify fields not shown by
* default. The order of the letters in this line corresponds to the
* order of the displayed fileds.
*
* all Options but 'q' can be read from this config file
* The delay time option syntax differs from the commandline syntax:
* only integer values between 2 and 9 seconds are recognized
* (this is for standard configuration, so I think this should do).
*
* usually this file is not edited by hand, but written from top using
* the 'W' command.
*/
static void get_options(void)
{
FILE *fp;
char *pt;
char *rcfile = NULL; /* path to rc file... */
char *home = NULL; /* path of user's home directory... */
size_t home_length = 0; /* length of path... */
char Options[256] = "";
int i;
cpu_mapping = (int *) xmalloc (sizeof (int) * smp_num_cpus);
/* read cpuname */
for (i=0; i< smp_num_cpus; i++) cpu_mapping[i]=i;
header_lines = 6 + smp_num_cpus;
fp = fopen(SYS_TOPRC, "r");
if (fp != NULL) {
fgets(Options, 254, fp);
fclose(fp);
}
parse_options(Options, 0);
strcpy(Options, "");
if ( (home = getenv("HOME")) != NULL) {
home_length = strlen(home);
}
if ( (rcfile = malloc(home_length + strlen(RCFILE) + 2))) {
if (home != NULL) {
strcpy(rcfile, home);
strcat(rcfile, "/");
}
strcat(rcfile, RCFILE);
fp = fopen(rcfile, "r");
if (fp == NULL) {
strcpy(Fields, DEFAULT_SHOW);
} else {
if (fgets(Fields, 254, fp) != NULL) {
pt = strchr(Fields, '\n');
if (pt) *pt = 0;
}
fgets(Options, 254, fp);
fclose(fp);
}
free(rcfile);
}
parse_options(Options, getuid()? Secure : 0);
}
/*
* Set up the terminal attributes.
*/
static void setup_terminal(void)
{
char *termtype;
struct termios newtty;
if (!Batch)
termtype = getenv("TERM");
else
termtype = "dumb";
if (!termtype) {
/* In theory, $TERM should never not be set, but in practice,
some gettys don't. Fortunately, vt100 is nearly always
correct (or pretty close). */
termtype = "VT100";
/* fprintf(stderr, PROGNAME ": $TERM not set\n"); */
/* exit(1); */
}
/*
* Get termcap entries and window size.
*/
if(tgetent(NULL, termtype) != 1) {
fprintf(stderr, PROGNAME ": Unknown terminal \"%s\" in $TERM\n",
termtype);
exit(1);
}
cm = tgetstr("cm", 0);
top_clrtobot = tgetstr("cd", 0);
cl = tgetstr("cl", 0);
top_clrtoeol = tgetstr("ce", 0);
ho = tgetstr("ho", 0);
md = tgetstr("md", 0);
mr = tgetstr("mr", 0);
me = tgetstr("me", 0);
if (Batch) return; /* the rest doesn't apply to batch mode */
if (tcgetattr(0, &Savetty) == -1) {
perror(PROGNAME ": tcgetattr() failed");
error_end(errno);
}
newtty = Savetty;
newtty.c_lflag &= ~ICANON;
newtty.c_lflag &= ~ECHO;
newtty.c_cc[VMIN] = 1;
newtty.c_cc[VTIME] = 0;
if (tcsetattr(0, TCSAFLUSH, &newtty) == -1) {
printf("cannot put tty into raw mode\n");
error_end(1);
}
tcgetattr(0, &Rawtty);
}
static int parseint(const char *src, const char *err)
{
char *endp;
int num;
int len;
num = strtol(src, &endp, 0);
if (*endp == '\0') return num;
/* also accept prefixes of: infinite, infinity, maximum, all */
len = strlen(src);
if(len<1) goto fail;
if(len<9 && !strncmp(src,"infinite",len)) return INT_MAX;
if(len<9 && !strncmp(src,"infinity",len)) return INT_MAX;
if(len<8 && !strncmp(src,"maximum" ,len)) return INT_MAX;
if(len<4 && !strncmp(src,"all" ,len)) return INT_MAX;
fail:
fprintf(stderr, err, src);
exit(1);
}
static double parseflt(const char *src, const char *err)
{
char *endp;
double num;
int len;
num = strtod(src, &endp);
if (*endp == '\0') return num;
/* also accept prefixes of: infinite, infinity, maximum, all */
len = strlen(src);
if(len<1) goto fail;
if(len<9 && !strncmp(src,"infinite",len)) return (double)INT_MAX;
if(len<9 && !strncmp(src,"infinity",len)) return (double)INT_MAX;
if(len<8 && !strncmp(src,"maximum" ,len)) return (double)INT_MAX;
if(len<4 && !strncmp(src,"all" ,len)) return (double)INT_MAX;
fail:
fprintf(stderr, err, src);
exit(1);
}
int main(int argc, char **argv)
{
/* For select(2). */
struct timeval tv;
fd_set in;
/* For parsing arguments. */
char *cp;
/* The key read in. */
char c;
struct sigaction sact;
setlocale(LC_ALL, "");
get_options();
/* set to PCPU sorting */
register_sort_function( -1, (cmp_t)pcpu_sort);
/*
* Parse arguments.
*/
(void)argc;
argv++;
while (*argv) {
cp = *argv++;
while (*cp) {
switch (*cp) {
case 'd':
if (cp[1]) {
Sleeptime = parseflt(++cp, PROGNAME ": Bad delay time %s'\n");
goto breakargv;
} else if (*argv) { /* last char in an argv, use next as arg */
Sleeptime = parseflt(cp = *argv++, PROGNAME ": Bad delay time %s'\n");
goto breakargv;
} else {
fprintf(stderr, "-d requires an argument\n");
exit(1);
}
break;
case 'n':
if (cp[1]) {
Loops = parseint(++cp, PROGNAME ": Bad value %s'\n");
goto breakargv;
} else if (*argv) { /* last char in an argv, use next as arg */
Loops = parseint(cp = *argv++, PROGNAME ": Bad value %s'\n");
goto breakargv;
}
break;
case 'q':
if (!getuid())
/* set priority to -10 in order to stay above kswapd */
if (setpriority(PRIO_PROCESS, getpid(), -10)) {
/* We check this just for paranoia. It's not
fatal, and shouldn't happen. */
perror(PROGNAME ": setpriority() failed");
}
Sleeptime = 0;
break;
case 'p':
if (monpids_index >= monpids_max) {
fprintf(stderr, PROGNAME ": More than %u process ids specified\n",
monpids_max);
exit(1);
}
if (cp[1]) {
if (sscanf(++cp, "%d", &monpids[monpids_index]) != 1 ||
monpids[monpids_index] < 0 || monpids[monpids_index] > 65535) {
fprintf(stderr, PROGNAME ": Bad process id `%s'\n", cp);
exit(1);
}
} else if (*argv) { /* last char in an argv, use next as arg */
if (sscanf(cp = *argv++, "%d", &monpids[monpids_index]) != 1 ||
monpids[monpids_index] < 0 || monpids[monpids_index] > 65535) {
fprintf(stderr, PROGNAME ": Bad process id `%s'\n", cp);
exit(1);
}
} else {
fprintf(stderr, "-p requires an argument\n");
exit(1);
}
if (!monpids[monpids_index])
monpids[monpids_index] = getpid();
/* default to no sorting when monitoring process ids */
if (!monpids_index++) {
sort_type = S_NONE;
reset_sort_options();
}
cp = "_";
break;
case 'b':
Batch = 1;
break;
case 'c':
show_cmd = !show_cmd;
break;
case 'S':
Cumulative = 1;
break;
case 'i':
Noidle = 1;
break;
case 's':
Secure = 1;
break;
case 'C':
CPU_states = 1;
break;
case '-':
break; /* Just ignore it */
case 'v':
case 'V':
fprintf(stdout, "top (%s)\n", procps_version);
exit(0);
case 'h':
fprintf(stdout, "usage: " PROGNAME " -hvbcisqS -d delay -p pid -n iterations\n");
exit(0);
default:
fprintf(stderr, PROGNAME ": Unknown argument `%c'\n", *cp);
fprintf(stdout, "usage: " PROGNAME " -hvbcisqS -d delay -p pid -n iterations\n");
exit(1);
}
cp++;
}
breakargv:
}
if (smp_num_cpus > 1 && CPU_states)
header_lines++;
meminfo(); /* need kb_main_total value filled in */
setup_terminal();
window_size(0);
/*
* Set up signal handlers.
*/
sact.sa_handler = end;
sact.sa_flags = 0;
sigemptyset(&sact.sa_mask);
sigaction(SIGHUP, &sact, NULL);
sigaction(SIGINT, &sact, NULL);
sigaction(SIGQUIT, &sact, NULL);
sact.sa_handler = stop;
sact.sa_flags = SA_RESTART;
sigaction(SIGTSTP, &sact, NULL);
sact.sa_handler = window_size;
sigaction(SIGWINCH, &sact, NULL);
sigaction(SIGCONT, &sact, NULL);
/* loop, collecting process info and sleeping */
while (1) {
if (Loops > 0)
Loops--;
/* display the tasks */
show_procs();
/* sleep & wait for keyboard input */
if (Loops == 0)
end(0);
if (!Batch)
{
tv.tv_sec = Sleeptime;
tv.tv_usec = (Sleeptime - (int) Sleeptime) * 1000000;
FD_ZERO(&in);
FD_SET(0, &in);
if (select(1, &in, 0, 0, &tv) > 0 && read(0, &c, 1) == 1)
do_key(c);
} else {
sleep(Sleeptime);
}
}
}
/*#######################################################################
*#### Signal handled routines: error_end, end, stop, window_size ###
*#### Small utilities: make_header, getstr, getint, getfloat, getsig ###
*#######################################################################
*/
/*
* end when exiting with an error.
*/
static void error_end(int rno)
{
if (!Batch)
tcsetattr(0, TCSAFLUSH, &Savetty);
PUTP(tgoto(cm, 0, Lines - 1));
fputs("\r\n", stdout);
exit(rno);
}
/*
* Normal end of execution.
*/
static void end(int signo)
{
(void)signo;
if (!Batch)
tcsetattr(0, TCSAFLUSH, &Savetty);
PUTP(tgoto(cm, 0, Lines - 1));
fputs("\r\n", stdout);
exit(0);
}
/*
* SIGTSTP catcher.
*/
static void stop(int signo)
{
(void)signo;
/* Reset terminal. */
if (!Batch)
tcsetattr(0, TCSAFLUSH, &Savetty);
PUTP(tgoto(cm, 0, Lines - 3));
fflush(stdout);
raise(SIGSTOP);
/* Later... */
if (!Batch)
tcsetattr (0, TCSAFLUSH, &Rawtty);
}
/*
* Reads the window size and clear the window. This is called on setup,
* and also catches SIGWINCHs, and adjusts Maxlines. Basically, this is
* the central place for window size stuff.
*/
static void window_size(int signo)
{
struct winsize ws;
(void)signo;
if((ioctl(1, TIOCGWINSZ, &ws) != -1) && (ws.ws_col>73) && (ws.ws_row>7)){
Cols = ws.ws_col;
Lines = ws.ws_row;
}else{
Cols = tgetnum("co");
Lines = tgetnum("li");
}
if (!Batch)
clear_screen();
/*
* calculate header size, length of cmdline field ...
*/
Numfields = make_header();
}
/*
* this prints a possible message from open_psdb_message
*/
static void top_message(const char *format, ...) {
va_list arg;
int n;
char buffer[512];
va_start (arg, format);
n = vsnprintf (buffer, 512, format, arg);
va_end (arg);
if (n > -1 && n < 512)
SHOWMESSAGE(("%s", buffer));
}
/*
* this adjusts the lines needed for the header to the current value
*/
static int make_header(void)
{
int i, j;
j = 0;
for (i = 0; i < strlen(Fields); i++) {
if (Fields[i] < 'a') {
pflags[j++] = Fields[i] - 'A';
if (Fields[i] == 'U' && CL_wchan_nout == -1) {
CL_wchan_nout = 0;
/* for correct handling of WCHAN fields, we have to do distingu
* between kernel versions */
/* get kernel symbol table, if needed */
if (open_psdb_message(NULL, top_message)) {
CL_wchan_nout = 1;
} else {
psdbsucc = 1;
}
}
}
}
strcpy(Header, "");
for (i = 0; i < j; i++)
strcat(Header, headers[pflags[i]]);
/* readjust window size ... */
Maxcmd = Cols - strlen(Header) + 7;
Maxlines = Display_procs ? Display_procs : Lines - header_lines;
if (Maxlines > Lines - header_lines)
Maxlines = Lines - header_lines;
return (j);
}
/*
* Get a string from the user; the base of getint(), et al. This really
* ought to handle long input lines and errors better. NB: The pointer
* returned is a statically allocated buffer, so don't expect it to
* persist between calls.
*/
static char *getstr(void)
{
static char line[BUFSIZ]; /* BUFSIZ from <stdio.h>; arbitrary */
int i = 0;
/* Must make sure that buffered IO doesn't kill us. */
fflush(stdout);
fflush(stdin); /* Not POSIX but ok */
do {
read(STDIN_FILENO, &line[i], 1);
} while (line[i++] != '\n' && i < sizeof(line));
line[--i] = 0;
return (line);
}
/*
* Get an integer from the user. Display an error message and
* return BAD_INPUT if it's invalid; else return the number.
*/
static int getint(void)
{
char *line;
int i;
int r;
line = getstr();
for (i = 0; line[i]; i++) {
if (!isdigit(line[i]) && line[i] != '-') {
SHOWMESSAGE(("That's not a number!"));
return (BAD_INPUT);
}
}
/* An empty line is a legal error (hah!). */
if (!line[0])
return (BAD_INPUT);
sscanf(line, "%d", &r);
return (r);
}
/*
* Get a float from the user. Just like getint().
*/
static float getfloat(void)
{
char *line;
int i;
float r;
char *savelocale;
line = getstr();
for (i = 0; line[i]; i++) {
if (!isdigit(line[i]) && line[i] != '.' && line[i] != '-') {
SHOWMESSAGE(("That's not a float!"));
return (BAD_INPUT);
}
}
/* An empty line is a legal error (hah!). */
if (!line[0])
return (BAD_INPUT);
savelocale = setlocale(LC_NUMERIC, NULL);
setlocale(LC_NUMERIC, "C");
sscanf(line, "%f", &r);
setlocale(LC_NUMERIC, savelocale);
return (r);
}
/*
* Get a signal number or name from the user. Return the number, or -1
* on error.
*/
static int getsig(void)
{
char *line;
/* This is easy. */
line = getstr();
return signal_name_to_number(line);
}
/*#######################################################################
*#### Routine for sorting on used time, resident memory and %CPU #####
*#### It would be easy to include full sorting capability as in #####
*#### ps, but I think there is no real use for something that #####
*#### complicated. Using register_sort_function or parse_sort_opt #####
*#### you just have to do the natural thing and it will work. #####
*#######################################################################
*/
static int time_sort (proc_t **P, proc_t **Q)
{
if (Cumulative) {
if( ((*P)->cutime + (*P)->cstime + (*P)->utime + (*P)->stime) <
((*Q)->cutime + (*Q)->cstime + (*Q)->utime + (*Q)->stime) )
return -1;
if( ((*P)->cutime + (*P)->cstime + (*P)->utime + (*P)->stime) >
((*Q)->cutime + (*Q)->cstime + (*Q)->utime + (*Q)->stime) )
return 1;
} else {
if( ((*P)->utime + (*P)->stime) < ((*Q)->utime + (*Q)->stime))
return -1;
if( ((*P)->utime + (*P)->stime) > ((*Q)->utime + (*Q)->stime))
return 1;
}
return 0;
}
static int pcpu_sort (proc_t **P, proc_t **Q)
{
if( (*P)->pcpu < (*Q)->pcpu ) return -1;
if( (*P)->pcpu > (*Q)->pcpu ) return 1;
return 0;
}
static int mem_sort (proc_t **P, proc_t **Q)
{
if( (*P)->vm_rss < (*Q)->vm_rss ) return -1;
if( (*P)->vm_rss > (*Q)->vm_rss ) return 1;
return 0;
}
int age_sort (proc_t **P, proc_t **Q)
{
if( (*P)->start_time < (*Q)->start_time ) return -1;
if( (*P)->start_time > (*Q)->start_time ) return 1;
return 0;
}
/*#######################################################################
*#### Routines handling the field selection/ordering screens: ########
*#### show_fields, change_order, change_fields ########
*#######################################################################
*/
/*
* Display the specification line of all fields. Upper case indicates
* a displayed field, display order is according to the order of the
* letters. A short description of each field is shown as well.
* The description of a displayed field is marked by a leading
* asterisk (*).
*/
static void show_fields(void)
{
int i, row, col;
char *p;
clear_screen();
PUTP(tgoto(cm, 3, 0));
printf("Current Field Order: %s\n", Fields);
for (i = 0; i < sizeof headers / sizeof headers[0]; ++i) {
row = i % (Lines - 3) + 3;
col = i / (Lines - 3) * 40;
PUTP(tgoto(cm, col, row));
for (p = headers[i]; *p == ' '; ++p);
printf("%c %c: %-10s = %s", (strchr(Fields, i + 'A') != NULL) ? '*' : ' ', i + 'A',
p, headers2[i]);
}
}
/*
* change order of displayed fields
*/
static void change_order(void)
{
char c, ch, *p;
int i;
show_fields();
for (;;) {
PUTP(tgoto(cm, 0, 0));
PUTP(top_clrtoeol);
PUTP(tgoto(cm, 3, 0));
PUTP(mr);
printf("Current Field Order: %s", Fields);
PUTP(me);
putchar('\n');
PUTP(tgoto(cm, 0, 1));
printf("Upper case characters move a field to the left, lower case to the right");
fflush(stdout);
if (!Batch) { /* should always be true, but... */
tcsetattr(0, TCSAFLUSH, &Rawtty);
read(0, &c, 1);
tcsetattr(0, TCSAFLUSH, &Savetty);
}
i = toupper(c) - 'A';
if ((p = strchr(Fields, i + 'A')) != NULL) {
if (isupper(c))
p--;
if ((p[1] != '\0') && (p >= Fields)) {
ch = p[0];
p[0] = p[1];
p[1] = ch;
}
} else if ((p = strchr(Fields, i + 'a')) != NULL) {
if (isupper(c))
p--;
if ((p[1] != '\0') && (p >= Fields)) {
ch = p[0];
p[0] = p[1];
p[1] = ch;
}
} else {
break;
}
}
Numfields = make_header();
}
/*
* toggle displayed fields
*/
static void change_fields(void)
{
int i, changed = 0;
int row, col;
char c, *p;
char tmp[2] = " ";
show_fields();
for (;;) {
PUTP(tgoto(cm, 0, 0));
PUTP(top_clrtoeol);
PUTP(tgoto(cm, 3, 0));
PUTP(mr);
printf("Current Field Order: %s", Fields);
PUTP(me);
putchar('\n');
PUTP(tgoto(cm, 0, 1));
if (!Batch) { /* should always be true, but... */
printf("Toggle fields with a-x, any other key to return: ");
fflush(stdout);
tcsetattr(0, TCSAFLUSH, &Rawtty);
read(0, &c, 1);
tcsetattr(0, TCSAFLUSH, &Savetty);
}
i = toupper(c) - 'A';
if (i >= 0 && i < sizeof headers / sizeof headers[0]) {
row = i % (Lines - 3) + 3;
col = i / (Lines - 3) * 40;
PUTP(tgoto(cm, col, row));
if ((p = strchr(Fields, i + 'A')) != NULL) { /* deselect Field */
*p = i + 'a';
putchar(' ');
} else if ((p = strchr(Fields, i + 'a')) != NULL) { /* select previously */
*p = i + 'A'; /* deselected field */
putchar('*');
} else { /* select new field */
tmp[0] = i + 'A';
strcat(Fields, tmp);
putchar('*');
}
changed = 1;
fflush(stdout);
} else
break;
}
if (changed)
Numfields = make_header();
}
/* Do the scaling stuff: interprets time in seconds, formats it to
* fit width, and returns pointer to static char*.
*/
static char *scale_time(int t,int width)
{
static char buf[100];
/* Try successively higher units until it fits */
sprintf(buf,"%d:%02d",t/60,t%60); /* minutes:seconds */
if (strlen(buf)<=width)
return buf;
t/=60; /* minutes */
sprintf(buf,"%dm",t);
if (strlen(buf)<=width)
return buf;
t/=60; /* hours */
sprintf(buf,"%dh",t);
if (strlen(buf)<=width)
return buf;
t/=24; /* days */
sprintf(buf,"%dd",t);
if (strlen(buf)<=width)
return buf;
t/=7; /* weeks */
sprintf(buf,"%dw",t);
return buf; /* this is our last try;
if it still doesn't fit, too bad. */
/* FIXME: if someone has a 16-way SMP running over a year... */
}
/* scale_k(k,width,unit) - interprets k as a count, formats to fit width.
if unit is 0, k is a byte count; 1 is a kilobyte
count; 2 for megabytes; 3 for gigabytes.
*/
static char *scale_k(int k,int width,int unit)
{
/* kilobytes, megabytes, gigabytes, too-big-for-int-bytes */
static double scale[]={1024,1024*1024,1024*1024*1024,0};
/* kilo, mega, giga, tera */
static char unitletters[]={'K','M','G','T',0};
static char buf[100];
char *up;
double *dp;
/* Try successively higher units until it fits */
sprintf(buf,"%d",k);
if (strlen(buf)<=width)
return buf;
for (up=unitletters+unit,dp=scale ; *dp ; ++dp,++up) {
sprintf(buf,"%.1f%c",k / *dp,*up);
if (strlen(buf)<=width)
return buf;
sprintf(buf,"%d%c",(int)(k / *dp),*up);
if (strlen(buf)<=width)
return buf;
}
/* Give up; give them what we got on our shortest attempt */
return buf;
}
/*
*#######################################################################
*#### Routines handling the main top screen: ########
*#### show_task_info, show_procs, show_memory, do_stats ########
*#######################################################################
*/
/*
* Displays infos for a single task
*/
static void show_task_info(proc_t *task)
{
int i,j;
unsigned int t;
char *cmdptr;
char tmp[2048], tmp2[2048] = "", tmp3[2048] = "", *p;
for (i = 0; i < Numfields; i++) {
tmp[0] = 0;
switch (pflags[i]) {
case P_PID:
sprintf(tmp, "%5d ", task->pid);
break;
case P_PPID:
sprintf(tmp, "%5d ", task->ppid);
break;
case P_EUID:
sprintf(tmp, "%4d ", task->euid);
break;
case P_EUSER:
sprintf(tmp, "%-8.8s ", task->euser);
break;
case P_PCPU:
sprintf(tmp, "%4.1f ", (float)task->pcpu / 10);
break;
case P_LCPU:
sprintf(tmp, "%2d ", task->processor);
break;
case P_PMEM: {
unsigned pmem;
pmem = task->vm_rss * 1000ULL / kb_main_total;
if (pmem > 999) pmem = 999;
sprintf(tmp, "%2u.%u ", pmem/10U, pmem%10U);
}
break;
case P_TTY: {
char outbuf[9];
dev_to_tty(outbuf, 8, task->tty, task->pid, ABBREV_DEV);
sprintf(tmp, "%-8.8s ", outbuf);
}
break;
case P_PRI:
sprintf(tmp, "%3.3s ", scale_k(task->priority, 3, 0));
break;
case P_NICE:
sprintf(tmp, "%3.3s ", scale_k(task->nice, 3, 0));
break;
case P_PAGEIN:
sprintf(tmp, "%6.6s ", scale_k(task->maj_flt, 6, 0));
break;
case P_TSIZ:
sprintf(tmp, "%5.5s ",
scale_k(((task->end_code - task->start_code) / 1024), 5, 1));
break;
case P_DSIZ:
sprintf(tmp, "%5.5s ",
scale_k(((task->vsize - task->end_code) / 1024), 5, 1));
break;
case P_SIZE:
sprintf(tmp, "%5.5s ", scale_k((task->size << CL_pg_shift), 5, 1));
break;
case P_TRS:
sprintf(tmp, "%4.4s ", scale_k((task->trs << CL_pg_shift), 4, 1));
break;
case P_SWAP:
sprintf(tmp, "%4.4s ",
scale_k(((task->size - task->resident) << CL_pg_shift), 4, 1));
break;
case P_SHARE:
sprintf(tmp, "%5.5s ", scale_k((task->share << CL_pg_shift), 5, 1));
break;
case P_A:
sprintf(tmp, "%3.3s ", "NYI");
break;
case P_WP:
sprintf(tmp, "%3.3s ", "NYI");
break;
case P_DT:
sprintf(tmp, "%3.3s ", scale_k(task->dt, 3, 0));
break;
case P_RSS: /* rss, not resident (which includes IO memory) */
sprintf(tmp, "%4.4s ",
scale_k((task->rss << CL_pg_shift), 4, 1));
break;
case P_WCHAN:
if (!CL_wchan_nout)
sprintf(tmp, "%-9.9s ", wchan(task->wchan));
else
sprintf(tmp, "%-9lx", task->wchan);
break;
case P_STAT:
sprintf(tmp, "%-4.4s ", status(task));
break;
case P_TIME:
t = (task->utime + task->stime) / Hertz;
if (Cumulative)
t += (task->cutime + task->cstime) / Hertz;
sprintf(tmp, "%6.6s ", scale_time(t,6));
break;
case P_COMMAND:
if (!show_cmd && task->cmdline && *(task->cmdline)) {
j=0;
while(((task->cmdline)[j] != NULL) && (strlen(tmp3)<1020)){
/* #if 0 */ /* This is useless? FIXME */
if (j > 0)
strcat(tmp3, " ");
/* #endif */
strncat(tmp3, (task->cmdline)[j], 1000);
j++;
}
cmdptr = tmp3;
} else {
cmdptr = task->cmd;
}
if (strlen(cmdptr) > Maxcmd)
cmdptr[Maxcmd - 1] = 0;
sprintf(tmp, "%s", cmdptr);
tmp3[0]=0;
break;
case P_FLAGS:
sprintf(tmp, "%8lx ", task->flags);
break;
}
strcat(tmp2, tmp);
}
if (strlen(tmp2) > Cols - 1)
tmp2[Cols - 1] = 0;
/* take care of cases like:
perl -e 'foo
bar foo bar
foo
# end of perl script'
*/
for (p=tmp2;*p;++p)
if (!isgraph(*p))
*p=' ';
printf("\n%s", tmp2);
PUTP(top_clrtoeol);
}
/*
* This is the real program! Read process info and display it.
* One could differentiate options of readproctable2, perhaps it
* would be useful to support the PROC_UID and PROC_TTY
* as command line options.
*/
static void show_procs(void)
{
static proc_t **p_table=NULL;
static int proc_flags;
int count;
int ActualLines;
float elapsed_time;
static int first=0;
if (first==0) {
proc_flags=PROC_FILLMEM|PROC_FILLCOM|PROC_FILLUSR|PROC_FILLSTATUS|PROC_FILLSTAT;
if (monpids_index)
proc_flags |= PROC_PID;
p_table=readproctab2(proc_flags, p_table, monpids);
elapsed_time = get_elapsed_time();
do_stats(p_table, elapsed_time, 0);
sleep(1);
first=1;
}
if (first && Batch)
fputs("\n\n",stdout);
/* Display the load averages. */
PUTP(ho);
PUTP(md);
if (show_loadav) {
printf("%s", sprint_uptime());
PUTP(top_clrtoeol);
putchar('\n');
}
p_table=readproctab2(proc_flags, p_table, monpids);
/* Immediately find out the elapsed time for the frame. */
elapsed_time = get_elapsed_time();
/* Display the system stats, calculate percent CPU time
* and sort the list. */
do_stats(p_table, elapsed_time,1);
/* Display the memory and swap space usage. */
show_meminfo();
if (strlen(Header) + 2 > Cols)
Header[Cols - 2] = 0;
PUTP(mr);
fputs(Header, stdout);
PUTP(top_clrtoeol);
PUTP(me);
/*
* Finally! Loop through to find the top task, and display it.
* Lather, rinse, repeat.
*/
count = 0;
ActualLines = 0;
while ((ActualLines < Maxlines) && (p_table[count]->pid!=-1)) {
char Stat;
Stat = p_table[count]->state;
if ( (!Noidle || (Stat != 'S' && Stat != 'Z')) &&
( (CurrUser[0] == '\0') ||
(!strcmp((char *)CurrUser,p_table[count]->euser) ) ) ) {
/*
* Show task info.
*/
show_task_info(p_table[count]);
if (!Batch)
ActualLines++;
}
count++;
}
PUTP(top_clrtobot);
PUTP(tgoto(cm, 0, header_lines - 2));
fflush(stdout);
}
/*
* Finds the current time (in microseconds) and calculates the time
* elapsed since the last update. This is essential for computing
* percent CPU usage.
*/
static float get_elapsed_time(void)
{
struct timeval t;
static struct timeval oldtime;
struct timezone timez;
float elapsed_time;
gettimeofday(&t, &timez);
elapsed_time = (t.tv_sec - oldtime.tv_sec)
+ (float) (t.tv_usec - oldtime.tv_usec) / 1000000.0;
oldtime.tv_sec = t.tv_sec;
oldtime.tv_usec = t.tv_usec;
return (elapsed_time);
}
/*
* Reads the memory info and displays it. Returns the total memory
* available, for use in percent memory usage calculations.
*/
static void show_meminfo(void)
{
meminfo(); /* read+parse /proc/meminfo */
if (show_memory) {
printf(
"Mem: %8dK total, %8dK used, %8dK free, %8dK buffers",
kb_main_total,
kb_main_used,
kb_main_free,
kb_main_buffers
);
PUTP(top_clrtoeol);
putchar('\n');
printf(
"Swap: %8dK total, %8dK used, %8dK free, %8dK cached",
kb_swap_total,
kb_swap_used,
kb_swap_free,
kb_main_cached
);
PUTP(top_clrtoeol);
putchar('\n');
}
PUTP(me);
PUTP(top_clrtoeol);
putchar('\n');
}
/***********************************************************************
* The /proc filesystem calculates idle=jiffies-(user+nice+sys) and we
* recover jiffies by adding up the 4 numbers we are given. SMP kernels
* (as of pre-2.4 era) can report idle time going backwards, perhaps due
* to non-atomic reads and updates. There is no locking for these values.
*/
#ifndef NAN
#define NAN (-0.0)
#endif
#define JT unsigned long long
static void four_cpu_numbers(double *uret, double *nret, double *sret, double *iret){
double tmp_u, tmp_n, tmp_s, tmp_i;
double scale; /* scale values to % */
static JT old_u, old_n, old_s, old_i;
JT new_u, new_n, new_s, new_i;
JT ticks_past; /* avoid div-by-0 by not calling too often :-( */
FILE_TO_BUF(STAT_FILE,stat_fd);
sscanf(buf, "cpu %Lu %Lu %Lu %Lu", &new_u, &new_n, &new_s, &new_i);
ticks_past = (new_u+new_n+new_s+new_i)-(old_u+old_n+old_s+old_i);
if(ticks_past){
scale = 100.0 / (double)ticks_past;
tmp_u = ( (double)new_u - (double)old_u ) * scale;
tmp_n = ( (double)new_n - (double)old_n ) * scale;
tmp_s = ( (double)new_s - (double)old_s ) * scale;
tmp_i = ( (double)new_i - (double)old_i ) * scale;
}else{
tmp_u = NAN;
tmp_n = NAN;
tmp_s = NAN;
tmp_i = NAN;
}
SET_IF_DESIRED(uret, tmp_u);
SET_IF_DESIRED(nret, tmp_n);
SET_IF_DESIRED(sret, tmp_s);
SET_IF_DESIRED(iret, tmp_i);
old_u=new_u;
old_n=new_n;
old_s=new_s;
old_i=new_i;
}
#undef JT
/***********************************************************************/
/*
* Calculates the number of tasks in each state (running, sleeping, etc.).
* Calculates the CPU time in each state (system, user, nice, etc).
* Calculates percent cpu usage for each task.
*/
static void do_stats(proc_t** p, float elapsed_time, int pass)
{
proc_t *this;
int arrindex, total_time, cpumap, i, n = 0;
int sleeping = 0, stopped = 0, zombie = 0, running = 0;
double system_ticks, user_ticks, nice_ticks, idle_ticks;
static int prev_count = 0;
int systime, usrtime;
/* start with one page as a reasonable allocate size */
static int save_history_size =
sizeof(long)*1024 / sizeof(struct save_hist);
static struct save_hist *save_history;
struct save_hist *New_save_hist;
if (!save_history)
save_history = xcalloc(NULL, sizeof(struct save_hist)*save_history_size);
New_save_hist = xcalloc(NULL, sizeof(struct save_hist)*save_history_size);
/*
* Make a pass through the data to get stats.
*/
arrindex = 0;
while (p[n]->pid != -1) {
this = p[n];
switch (this->state) {
case 'S':
case 'D':
sleeping++;
break;
case 'T':
stopped++;
break;
case 'Z':
zombie++;
break;
case 'R':
running++;
break;
default:
/* Don't know how to handle this one. */
break;
}
/*
* Calculate time in this process. Time is sum of user time
* (usrtime) plus system time (systime).
*/
total_time = this->utime + this->stime;
if (arrindex >= save_history_size) {
save_history_size *= 2;
save_history = xrealloc(save_history, sizeof(struct save_hist)*save_history_size);
New_save_hist = xrealloc(New_save_hist, sizeof(struct save_hist)*save_history_size);
}
New_save_hist[arrindex].ticks = total_time;
New_save_hist[arrindex].pid = this->pid;
systime = this->stime;
usrtime = this->utime;
New_save_hist[arrindex].stime = systime;
New_save_hist[arrindex].utime = usrtime;
/* find matching entry from previous pass */
for (i = 0; i < prev_count; i++) {
if (save_history[i].pid == this->pid) {
total_time -= save_history[i].ticks;
systime -= save_history[i].stime;
usrtime -= save_history[i].utime;
i = prev_count;
}
}
/*
* Calculate percent cpu time for this task.
*/
this->pcpu = (total_time * 10 * 100/Hertz) / elapsed_time;
if (this->pcpu > 999)
this->pcpu = 999;
arrindex++;
n++;
}
/*
* Display stats.
*/
if (pass > 0 && show_stats) {
printf("%d processes: %d sleeping, %d running, %d zombie, "
"%d stopped",
n, sleeping, running, zombie, stopped);
PUTP(top_clrtoeol);
putchar('\n');
four_cpu_numbers(&user_ticks,&nice_ticks,&system_ticks,&idle_ticks);
printf("CPU states:"
" %# 5.1f%% user, %# 5.1f%% system,"
" %# 5.1f%% nice, %# 5.1f%% idle",
user_ticks,
system_ticks,
nice_ticks,
idle_ticks
);
PUTP(top_clrtoeol);
putchar('\n');
}
/*
* Save this frame's information.
*/
for (i = 0; i < n; i++) {
/* copy the relevant info for the next pass */
save_history[i].pid = New_save_hist[i].pid;
save_history[i].ticks = New_save_hist[i].ticks;
save_history[i].stime = New_save_hist[i].stime;
save_history[i].utime = New_save_hist[i].utime;
}
free(New_save_hist);
prev_count = n;
qsort(p, n, sizeof(proc_t*), (void*)mult_lvl_cmp);
}
/*
* Process keyboard input during the main loop
*/
static void do_key(char c)
{
int numinput, i;
char rcfile[MAXNAMELEN];
FILE *fp;
/*
* First the commands which don't require a terminal mode switch.
*/
if (c == 'q')
end(0);
else if (c == ' ')
return;
else if (c == 12) {
clear_screen();
return;
} else if (c == 'I') {
Irixmode=(Irixmode) ? 0 : 1;
return;
}
/*
* Switch the terminal to normal mode. (Will the original
* attributes always be normal? Does it matter? I suppose the
* shell will be set up the way the user wants it.)
*/
if (!Batch) tcsetattr(0, TCSANOW, &Savetty);
/*
* Handle the rest of the commands.
*/
switch (c) {
case '?':
case 'h':
PUTP(cl); PUTP(ho); putchar('\n'); PUTP(mr);
printf("Proc-Top Revision 1.2");
PUTP(me); putchar('\n');
printf("Secure mode ");
PUTP(md);
fputs(Secure ? "on" : "off", stdout);
PUTP(me);
fputs("; cumulative mode ", stdout);
PUTP(md);
fputs(Cumulative ? "on" : "off", stdout);
PUTP(me);
fputs("; noidle mode ", stdout);
PUTP(md);
fputs(Noidle ? "on" : "off", stdout);
PUTP(me);
fputs("\n\n", stdout);
printf("%s\n\nPress any key to continue", Secure ? SECURE_HELP_SCREEN : HELP_SCREEN);
if (!Batch) tcsetattr(0, TCSANOW, &Rawtty);
(void) getchar();
break;
case 'i':
Noidle = !Noidle;
SHOWMESSAGE(("No-idle mode %s", Noidle ? "on" : "off"));
break;
case 'u':
SHOWMESSAGE(("Which User (Blank for All): "));
strcpy(CurrUser,getstr());
break;
case 'k':
if (Secure)
SHOWMESSAGE(("\aCan't kill in secure mode"));
else {
int pid, signo;
PUTP(md);
SHOWMESSAGE(("PID to kill: "));
pid = getint();
if (pid == BAD_INPUT)
break;
PUTP(top_clrtoeol);
SHOWMESSAGE(("Kill process %d with what signal? [15] ", pid));
PUTP(me);
signo = getsig();
/* FIXME: -1 may mean an unknown signal */
if (signo == -1)
signo = SIGTERM;
if (kill(pid, signo))
SHOWMESSAGE(("\aKill of PID %d with %d failed: %s",
pid, signo, strerror(errno)));
}
break;
case 'l':
SHOWMESSAGE(("Display load average %s", !show_loadav ? "on" : "off"));
if (show_loadav) {
show_loadav = 0;
header_lines--;
} else {
show_loadav = 1;
header_lines++;
}
Numfields = make_header();
break;
case 'm':
SHOWMESSAGE(("Display memory information %s", !show_memory ? "on" : "off"));
if (show_memory) {
show_memory = 0;
header_lines -= 2;
} else {
show_memory = 1;
header_lines += 2;
}
Numfields = make_header();
break;
case 'M':
SHOWMESSAGE(("Sort by memory usage"));
sort_type = S_MEM;
reset_sort_options();
register_sort_function(-1, (cmp_t)mem_sort);
break;
case 'n':
case '#':
printf("Processes to display (0 for unlimited): ");
numinput = getint();
if (numinput != -1) {
Display_procs = numinput;
window_size(0);
}
break;
case 'r':
if (Secure)
SHOWMESSAGE(("\aCan't renice in secure mode"));
else {
int pid, val;
printf("PID to renice: ");
pid = getint();
if (pid == BAD_INPUT)
break;
PUTP(tgoto(cm, 0, header_lines - 2));
PUTP(top_clrtoeol);
printf("Renice PID %d to value: ", pid);
val = getint();
if (val == BAD_INPUT)
val = 10;
if (setpriority(PRIO_PROCESS, pid, val))
SHOWMESSAGE(("\aRenice of PID %d to %d failed: %s",
pid, val, strerror(errno)));
}
break;
case 'P':
SHOWMESSAGE(("Sort by CPU usage"));
sort_type = S_PCPU;
reset_sort_options();
register_sort_function(-1, (cmp_t)pcpu_sort);
break;
case 'A':
SHOWMESSAGE(("Sort by age"));
sort_type = S_AGE;
reset_sort_options();
register_sort_function(-1, (cmp_t)age_sort);
break;
case 'N':
SHOWMESSAGE(("Sort numerically by pid"));
sort_type = S_NONE;
reset_sort_options();
break;
case 'c':
show_cmd = !show_cmd;
SHOWMESSAGE(("Show %s", show_cmd ? "command names" : "command line"));
break;
case 'S':
Cumulative = !Cumulative;
SHOWMESSAGE(("Cumulative mode %s", Cumulative ? "on" : "off"));
if (Cumulative)
headers[22][1] = 'C';
else
headers[22][1] = ' ';
Numfields = make_header();
break;
case 's':
if (Secure)
SHOWMESSAGE(("\aCan't change delay in secure mode"));
else {
double tmp;
printf("Delay between updates: ");
tmp = getfloat();
if (!(tmp < 0))
Sleeptime = tmp;
}
break;
case 't':
SHOWMESSAGE(("Display summary information %s", !show_stats ? "on" : "off"));
if (show_stats) {
show_stats = 0;
header_lines -= 2;
} else {
show_stats = 1;
header_lines += 2;
}
Numfields = make_header();
break;
case 'T':
SHOWMESSAGE(("Sort by %stime", Cumulative ? "cumulative " : ""));
sort_type = S_TIME;
reset_sort_options();
register_sort_function( -1, (cmp_t)time_sort);
break;
case 'f':
case 'F':
change_fields();
break;
case 'o':
case 'O':
change_order();
break;
case 'W':
if (Secure)
SHOWMESSAGE(("\aCan't write configuration in secure mode"));
else {
if (getenv("HOME")) {
strcpy(rcfile, getenv("HOME"));
strcat(rcfile, "/");
strcat(rcfile, RCFILE);
fp = fopen(rcfile, "w");
if (fp != NULL) {
fprintf(fp, "%s\n", Fields);
i = (int) Sleeptime;
if (i < 2)
i = 2;
if (i > 9)
i = 9;
fprintf(fp, "%d", i);
if (Secure)
fprintf(fp, "%c", 's');
if (Cumulative)
fprintf(fp, "%c", 'S');
if (!show_cmd)
fprintf(fp, "%c", 'c');
if (Noidle)
fprintf(fp, "%c", 'i');
if (!show_memory)
fprintf(fp, "%c", 'm');
if (!show_loadav)
fprintf(fp, "%c", 'l');
if (!show_stats)
fprintf(fp, "%c", 't');
if (!Irixmode)
fprintf(fp, "%c", 'I');
fprintf(fp, "\n");
fclose(fp);
SHOWMESSAGE(("Wrote configuration to %s", rcfile));
} else {
SHOWMESSAGE(("Couldn't open %s", rcfile));
}
} else {
SHOWMESSAGE(("Couldn't get $HOME -- not saving"));
}
}
break;
default:
SHOWMESSAGE(("\aUnknown command `%c' -- hit `h' for help", c));
}
/*
* Return to raw mode.
*/
if (!Batch) tcsetattr(0, TCSANOW, &Rawtty);
return;
}
/*#####################################################################
*####### A readproctable function that uses already allocated #####
*####### table entries. #####
*#####################################################################
*/
#define Do(x) (flags & PROC_ ## x)
static proc_t** readproctab2(int flags, proc_t** tab, ...) {
PROCTAB* PT = NULL;
static proc_t *buff;
int n = 0;
static int len = 0;
va_list ap;
va_start(ap, tab); /* pass through args to openproc */
if (Do(UID)) {
/* temporary variables to ensure that va_arg() instances
* are called in the right order
*/
uid_t* u;
int i;
u = va_arg(ap, uid_t*);
i = va_arg(ap, int);
PT = openproc(flags, u, i);
}
else if (Do(PID)) {
PT = openproc(flags, va_arg(ap, void*)); /* assume ptr sizes same */
/* work around a bug in openproc() */
PT->procfs = NULL;
/* share some process time, since we skipped opendir("/proc") */
usleep (50*1000);
}
else if (Do(TTY) || Do(STAT))
PT = openproc(flags, va_arg(ap, void*)); /* assume ptr sizes same */
else
PT = openproc(flags);
va_end(ap);
buff = (proc_t *) 1;
while (n<len && buff) { /* read table: (i) already allocated chunks */
if (tab[n]->cmdline) {
free((void*)*tab[n]->cmdline);
tab[n]->cmdline = NULL;
}
buff = readproc(PT, tab[n]);
if (buff) n++;
}
if (buff) {
do { /* (ii) not yet allocated chunks */
tab = xrealloc(tab, (n+1)*sizeof(proc_t*));/* realloc as we go, using */
buff = readproc(PT, NULL); /* final null to terminate */
if(buff) tab[n]=buff;
len++;
n++;
} while (buff); /* stop when NULL reached */
tab[n-1] = xcalloc(NULL, sizeof (proc_t));
tab[n-1]->pid=-1; /* Mark end of Table */
} else {
if (n == len) {
tab = xrealloc(tab, (n+1)*sizeof(proc_t*));
tab[n] = xcalloc(NULL, sizeof (proc_t));
len++;
}
tab[n]->pid=-1; /* Use this instead of NULL when not at the end of */
} /* the allocated space */
closeproc(PT);
return tab;
}
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