summaryrefslogtreecommitdiff
path: root/px.c
blob: 2abcf07a9446848cee8c2b6d28228bf3882481e3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
#include <sys/auxv.h>
#include <sys/sysinfo.h>

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include <proc/readproc.h>

static void
print_human(intmax_t i)
{
        double d = i;
        const char *u = "\0\0K\0M\0G\0T\0P\0E\0Z\0Y\0";
        while (d >= 1024) {
                u += 2;
                d /= 1024.0;
        }

        if (!*u)
                printf("%5.0f", d);
        else if (d < 10.0)
                printf("%4.1f%s", d, u);
        else
                printf("%4.0f%s", d, u);
}

static void
print_time(time_t t) {
	unsigned int dd, hh, mm, ss;

	ss = t % 60; t /= 60;
	mm = t % 60; t /= 60;
	hh = t % 24; t /= 24;
	dd = t;

	if (dd)
		printf(" %3ud%02uh", dd, hh);
	else if (hh)
		printf("  %2uh%02um", hh, mm);
	else
		printf("   %2u:%02u", mm, ss);
}

int
main(int argc, char *argv[])
{
	proc_t **result;
	int clktck;

	if ((clktck = getauxval(AT_CLKTCK)) <= 0)
		if ((clktck = sysconf(_SC_CLK_TCK)) <= 0)
			clktck = 100; 	/* educated guess */

	struct sysinfo si;
	sysinfo(&si);

	time_t now = time(0);

	result = readproctab(PROC_FILLMEM | PROC_FILLCOM | PROC_FILLUSR |
	    PROC_FILLSTAT | PROC_FILLSTATUS);

	int matched = 0;

	for (; *result; result++) {
		proc_t *p = *result;

		if (argc > 1) {
			for (int i = 1; i < argc; i++)
				if (strstr(p->cmd, argv[i]))
					goto match;
			continue;
match:
			matched++;
		} else {
			matched++;
		}

		if (matched == 1)
			printf("  PID USER     %%CPU  VSZ  RSS START ELAPSED CPUTIME COMMAND\n");

		printf("%5d", p->tid);
		printf(" %-8.8s", p->euser);

		double pcpu = 0;
		time_t seconds;
		time_t cputime;

		cputime = (p->utime + p->stime) / clktck;
		seconds = si.uptime - p->start_time / clktck;
		if (seconds)
			pcpu = (cputime * 100.0) / seconds;

		printf(" %4.1f", pcpu);
		print_human(p->vm_size*1024);
		print_human(p->vm_rss*1024);

		time_t start;
		time_t seconds_ago;
		start = (now - si.uptime) + p->start_time / clktck;
		seconds_ago = now - start;
		if (seconds_ago < 0)
			seconds_ago = 0;

		char buf[7];
		if (seconds_ago > 3600*24)
			strftime(buf, sizeof buf, "%b%d", localtime(&start));
		else
			strftime(buf, sizeof buf, "%H:%M", localtime(&start));
		printf(" %s", buf);

		print_time(seconds_ago);

		print_time(cputime);

		if (p->cmdline) {
			for (int i = 0; p->cmdline[i]; i++) {
				printf(" %s", p->cmdline[i]);
			}
		} else {
			// kernel threads
			printf(" [%s]", p->cmd);
		}

		if (p->state == 'Z')
			printf(" <defunct>");
		printf("\n");
	}

	exit(!matched);
}