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top: add -p option and p command to only show a single process

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Allow to show only a single process specified by PID. This could
be done either by running top like 'top -p PID' or using the 'p' command
inside top.

Reviewed by:	eadler
Approved by:	eadler
Obtained from:	OpenBSD
Differential Revision:	https://reviews.freebsd.org/D15501
This commit is contained in:
novel 2018-06-02 15:52:18 +00:00
parent 107463a1fd
commit f2fe0a1957
8 changed files with 121 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
usr.bin/top/commands.c
View File

@ -92,6 +92,7 @@ o - specify sort order (pri, size, res, cpu, time, threads, jid, pid)\n",
o - specify sort order (vcsw, ivcsw, read, write, fault, total, jid, pid)\n",
stdout);
fputs("\
p - display one process (+ selects all processes)\n\
P - toggle the displaying of per-CPU statistics\n\
r - renice a process\n\
s - change number of seconds to delay between updates\n\

13
usr.bin/top/machine.c
View File

@ -764,6 +764,7 @@ get_process_info(struct system_info *si, struct process_select *sel,
int show_self;
int show_system;
int show_uid;
int show_pid;
int show_kidle;
/*
@ -783,7 +784,7 @@ get_process_info(struct system_info *si, struct process_select *sel,
previous_pref = malloc(nproc * sizeof(*previous_pref));
if (previous_procs == NULL || previous_pref == NULL) {
(void) fprintf(stderr, "top: Out of memory.\n");
quit(23);
quit(TOP_EX_SYS_ERROR);
}
previous_proc_count_max = nproc;
}
@ -822,7 +823,7 @@ get_process_info(struct system_info *si, struct process_select *sel,
}
if (pref == NULL || pbase == NULL || pcpu == NULL) {
(void) fprintf(stderr, "top: Out of memory.\n");
quit(23);
quit(TOP_EX_SYS_ERROR);
}
/* get a pointer to the states summary array */
si->procstates = process_states;
@ -833,6 +834,7 @@ get_process_info(struct system_info *si, struct process_select *sel,
show_self = sel->self == -1;
show_system = sel->system;
show_uid = sel->uid[0] != -1;
show_pid = sel->pid != -1;
show_kidle = sel->kidle;
/* count up process states and get pointers to interesting procs */
@ -894,6 +896,9 @@ get_process_info(struct system_info *si, struct process_select *sel,
/* skip proc. that don't belong to the selected UID */
continue;
if (show_pid && pp->ki_pid != sel->pid)
continue;
*prefp++ = pp;
active_procs++;
}
@ -1177,12 +1182,12 @@ getsysctl(const char *name, void *ptr, size_t len)
if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) {
fprintf(stderr, "top: sysctl(%s...) failed: %s\n", name,
strerror(errno));
quit(23);
quit(TOP_EX_SYS_ERROR);
}
if (nlen != len) {
fprintf(stderr, "top: sysctl(%s...) expected %lu, got %lu\n",
name, (unsigned long)len, (unsigned long)nlen);
quit(23);
quit(TOP_EX_SYS_ERROR);
}
}

1
usr.bin/top/machine.h
View File

@ -69,6 +69,7 @@ struct process_select
int jail; /* show jail ID */
int swap; /* show swap usage */
int kidle; /* show per-CPU idle threads */
pid_t pid; /* only this pid (unless pid == -1) */
char *command; /* only this command (unless == NULL) */
};

13
usr.bin/top/top.1
View File

@ -15,6 +15,11 @@ top \- display and update information about the top cpu processes
.BI \-m io | cpu
] [
.BI \-o field
]
.br
.ti +4
[
.BI \-p pid
] [
.BI \-s time
] [
@ -178,6 +183,10 @@ is the name of the column as seen in the output, but in lower case:
\*(rqwrite\*(lq, \*(rqfault\*(lq, \*(rqvcsw\*(lq, \*(rqivcsw\*(lq,
\*(lqjid\*(lq, \*(rqswap\*(lq or \*(rqpid\*(lq.
.TP
.BI \-p pid
Show only the process
.IR pid .
.TP
.BI \-J jail
Show only those processes owned by
.IR jail .
@ -320,6 +329,10 @@ available on all systems. The sort key names vary from system to system
but usually include: \*(lqcpu\*(rq, \*(lqres\*(rq, \*(lqsize\*(rq,
\*(lqtime\*(rq. The default is cpu.
.TP
.B p
Display a specific process (prompt for pid).
If the pid specified is simply \*(lq+\*(rq, then show all processes.
.TP
.B e
Display a list of system errors (if any) generated by the last
.BR k ill

60
usr.bin/top/top.c
View File

@ -226,8 +226,9 @@ main(int argc, char *argv[])
char *order_name = NULL;
int order_index = 0;
fd_set readfds;
char old_system = false;
static char command_chars[] = "\f qh?en#sdkriIutHmSCajzPJwo";
static char command_chars[] = "\f qh?en#sdkriIutHmSCajzPJwop";
/* these defines enumerate the "strchr"s of the commands in command_chars */
#define CMD_redraw 0
#define CMD_update 1
@ -256,7 +257,8 @@ main(int argc, char *argv[])
#define CMD_pcputog 23
#define CMD_jail 24
#define CMD_swaptog 25
#define CMD_order 26
#define CMD_order 26
#define CMD_pid 27
/* set the buffer for stdout */
#ifdef DEBUG
@ -291,6 +293,7 @@ main(int argc, char *argv[])
ps.jail = false;
ps.swap = false;
ps.kidle = true;
ps.pid = -1;
ps.command = NULL;
/* get preset options from the environment */
@ -316,7 +319,7 @@ main(int argc, char *argv[])
optind = 1;
}
while ((i = getopt(ac, av, "CSIHPabijJ:nquvzs:d:U:m:o:tw")) != EOF)
while ((i = getopt(ac, av, "CSIHPabijJ:nquvzs:d:U:m:o:p:tw")) != EOF)
{
switch(i)
{
@ -338,7 +341,8 @@ main(int argc, char *argv[])
break;
case 'S': /* show system processes */
ps.system = !ps.system;
ps.system = true;
old_system = true;
break;
case 'I': /* show idle processes */
@ -371,6 +375,19 @@ main(int argc, char *argv[])
displays = i;
}
break;
case 'p': {
unsigned long long num;
const char *errstr;
num = strtonum(optarg, 0, INT_MAX, &errstr);
if (errstr != NULL || !find_pid(num)) {
fprintf(stderr, "%s: unknown pid\n", optarg);
exit(1);
}
ps.pid = (pid_t)num;
ps.system = true;
break;
}
case 's':
if ((delay = atoi(optarg)) < 0 || (delay == 0 && getuid() != 0))
@ -456,8 +473,8 @@ main(int argc, char *argv[])
default:
fprintf(stderr,
"Usage: %s [-abCHIijnPqStuvwz] [-d count] [-m io | cpu] [-o field] [-s time]\n"
" [-J jail] [-U username] [number]\n",
"Usage: %s [-abCHIijnPqStuvwz] [-d count] [-m io | cpu] [-o field] [-p pid]\n"
" [-s time] [-J jail] [-U username] [number]\n",
myname);
exit(1);
}
@ -1018,6 +1035,7 @@ main(int argc, char *argv[])
break;
case CMD_viewsys:
ps.system = !ps.system;
old_system = ps.system;
break;
case CMD_showargs:
fmt_flags ^= FMT_SHOWARGS;
@ -1117,6 +1135,36 @@ main(int argc, char *argv[])
reset_display();
putchar('\r');
break;
case CMD_pid:
new_message(MT_standout,
"Process id to show (+ for all): ");
if (readline(tempbuf2, sizeof(tempbuf2), false) > 0) {
if (tempbuf2[0] == '+' &&
tempbuf2[1] == '\0') {
ps.pid = (pid_t)-1;
ps.system = old_system;
} else {
unsigned long long num;
const char *errstr;
num = strtonum(tempbuf2, 0, INT_MAX,
&errstr);
if (errstr != NULL || !find_pid(num)) {
new_message(MT_standout,
" %s: unknown pid",
tempbuf2);
no_command = true;
} else {
if (ps.system == false)
old_system = false;
ps.pid = (pid_t)num;
ps.system = true;
}
}
putchar('\r');
} else
clear_message();
break;
default:
new_message(MT_standout, " BAD CASE IN SWITCH!");
putchar('\r');

3
usr.bin/top/top.h
View File

@ -34,6 +34,9 @@ extern int Header_lines; /* 7 */
#define NUM_AVERAGES 3
/* Exit code for system errors */
#define TOP_EX_SYS_ERROR 23
enum displaymodes { DISP_CPU = 0, DISP_IO, DISP_MAX };
/*

37
usr.bin/top/utils.c
View File

@ -15,9 +15,18 @@
#include "top.h"
#include "utils.h"
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <paths.h>
#include <kvm.h>
void quit(int);
int
atoiwi(const char *str)
@ -417,3 +426,31 @@ format_k2(unsigned long long amt)
return(ret);
}
int
find_pid(pid_t pid)
{
kvm_t *kd = NULL;
struct kinfo_proc *pbase = NULL;
int nproc;
int ret = 0;
kd = kvm_open(NULL, _PATH_DEVNULL, NULL, O_RDONLY, NULL);
if (kd == NULL) {
fprintf(stderr, "top: kvm_open() failed.\n");
quit(TOP_EX_SYS_ERROR);
}
pbase = kvm_getprocs(kd, KERN_PROC_PID, pid, &nproc);
if (pbase == NULL) {
goto done;
}
if ((nproc == 1) && (pbase->ki_pid == pid)) {
ret = 1;
}
done:
kvm_close(kd);
return ret;
}

3
usr.bin/top/utils.h
View File

@ -10,6 +10,8 @@
* Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
*/
#include <unistd.h>
int atoiwi(const char *);
char *itoa(unsigned int);
char *itoa7(unsigned int);
@ -20,4 +22,5 @@ char *format_time(long);
char *format_k(int);
char *format_k2(unsigned long long);
int string_index(const char *string, char *array[]);
int find_pid(pid_t pid);