ps_u.c

/*	ps - toolbox
	Copyright 2015 libdll.so

	This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
*/

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <pwd.h>

static char *nexttoksep(char **strp, const char *sep) {
	char *p = strsep(strp, sep);
	return p ? : "";
}

static char *nexttok(char **strp) {
	return nexttoksep(strp, " ");
}

#define SHOW_PRIO 1
#define SHOW_TIME 2
#define SHOW_POLICY 4
#define SHOW_CPU  8
#define SHOW_MACLABEL 16

static int display_flags = 0;

static int ps_line(int pid, int tid, const char *namefilter) {
	char statline[1024];
	char command[1024];
	char macline[1024];
	char user[32];
	struct stat stats;
	int fd, r;
	char *ptr, *name, *state;
	int ppid, tty;
	unsigned wchan, rss, vss, eip;
	unsigned utime, stime;
	int prio, nice, rtprio, sched, psr;
	struct passwd *pw;
	
	sprintf(statline, "/proc/%d", pid);
	stat(statline, &stats);

	if(tid) {
		sprintf(statline, "/proc/%d/task/%d/stat", pid, tid);
		command[0] = 0;
		snprintf(macline, sizeof(macline), "/proc/%d/task/%d/attr/current", pid, tid);
	} else {
		sprintf(statline, "/proc/%d/stat", pid);
		sprintf(command, "/proc/%d/cmdline", pid);
		snprintf(macline, sizeof(macline), "/proc/%d/attr/current", pid);
		fd = open(command, O_RDONLY);
		if(fd == -1) {
			r = 0;
		} else {
			r = read(fd, command, 1023);
			close(fd);
			if(r < 0) r = 0;
		}
		command[r] = 0;
	}
	
	fd = open(statline, O_RDONLY);
	if(fd == -1) return -1;
	r = read(fd, statline, 1023);
	close(fd);
	if(r < 0) return -1;
	statline[r] = 0;

	ptr = statline;
	nexttok(&ptr); // skip pid
	ptr++;	       // skip "("

	name = ptr;
	ptr = strrchr(ptr, ')'); // Skip to *last* occurence of ')',
	*ptr++ = '\0';		 // and null-terminate name.

	ptr++;		  // skip " "
	state = nexttok(&ptr);
	ppid = atoi(nexttok(&ptr));
	nexttok(&ptr); // pgrp
	nexttok(&ptr); // sid
	tty = atoi(nexttok(&ptr));
	
	nexttok(&ptr); // tpgid
	nexttok(&ptr); // flags
	nexttok(&ptr); // minflt
	nexttok(&ptr); // cminflt
	nexttok(&ptr); // majflt
	nexttok(&ptr); // cmajflt
#if 1
	utime = atoi(nexttok(&ptr));
	stime = atoi(nexttok(&ptr));
#else
	nexttok(&ptr); // utime
	nexttok(&ptr); // stime
#endif
	nexttok(&ptr); // cutime
	nexttok(&ptr); // cstime
	prio = atoi(nexttok(&ptr));
	nice = atoi(nexttok(&ptr));
	nexttok(&ptr); // threads
	nexttok(&ptr); // itrealvalue
	nexttok(&ptr); // starttime
	vss = strtoul(nexttok(&ptr), 0, 10); // vsize
	rss = strtoul(nexttok(&ptr), 0, 10); // rss
	nexttok(&ptr); // rlim
	nexttok(&ptr); // startcode
	nexttok(&ptr); // endcode
	nexttok(&ptr); // startstack
	nexttok(&ptr); // kstkesp
	eip = strtoul(nexttok(&ptr), 0, 10); // kstkeip
	nexttok(&ptr); // signal
	nexttok(&ptr); // blocked
	nexttok(&ptr); // sigignore
	nexttok(&ptr); // sigcatch
	wchan = strtoul(nexttok(&ptr), 0, 10); // wchan
	nexttok(&ptr); // nswap
	nexttok(&ptr); // cnswap
	nexttok(&ptr); // exit signal
	psr = atoi(nexttok(&ptr)); // processor
	rtprio = atoi(nexttok(&ptr)); // rt_priority
	sched = atoi(nexttok(&ptr)); // scheduling policy
	
	tty = atoi(nexttok(&ptr));
	
	if(tid != 0) {
		ppid = pid;
		pid = tid;
	}

	pw = getpwuid(stats.st_uid);
	if(pw == 0) {
		sprintf(user, "%d", (int)stats.st_uid);
	} else {
		strcpy(user, pw->pw_name);
	}

	if(!namefilter || strcmp(name, namefilter) == 0) {
		if (display_flags & SHOW_MACLABEL) {
			fd = open(macline, O_RDONLY);
			strcpy(macline, "-");
			if(fd >= 0) {
				r = read(fd, macline, sizeof(macline)-1);
				close(fd);
				if(r > 0) macline[r] = 0;
			}
			printf("%-30s %-9s %-5d %-5d %s\n", macline, user, pid, ppid, command[0] ? command : name);
			return 0;
		}

		printf("%-9s %-5d %-5d %-6d %-5d", user, pid, ppid, vss / 1024, rss * 4);
		if(display_flags & SHOW_CPU) printf(" %-2d", psr);
		if(display_flags & SHOW_PRIO) printf(" %-5d %-5d %-5d %-5d", prio, nice, rtprio, sched);

		printf(" %08x %08x %s %s", wchan, eip, state, command[0] ? command : name);
		if(display_flags&SHOW_TIME) printf(" (u:%d, s:%d)", utime, stime);

		putchar('\n');
	}
	return 0;
}

static void ps_threads(int pid, const char *namefilter) {
	char tmp[128];
	DIR *d;
	struct dirent *de;

	sprintf(tmp,"/proc/%d/task",pid);
	d = opendir(tmp);
	if(!d) return;
	while((de = readdir(d))) {
		if(isdigit(de->d_name[0])) {
			int tid = atoi(de->d_name);
			if(tid == pid) continue;
			ps_line(pid, tid, namefilter);
		}
	}
	closedir(d);
}

int ps_main(int argc, char **argv) {
	DIR *d;
	struct dirent *de;
	const char *namefilter = 0;
	int pidfilter = 0;
	int threads = 0;

	d = opendir("/proc");
	if(!d) {
		perror("/proc");
		return -1;
	}

	while(argc > 1) {
		if(strcmp(argv[1], "-t") == 0) {
			threads = 1;
		} else if(strcmp(argv[1],"-x") == 0) {
			display_flags |= SHOW_TIME;
		} else if(strcmp(argv[1], "-Z") == 0) {
			display_flags |= SHOW_MACLABEL;
		} else if(strcmp(argv[1], "-P") == 0) {
			display_flags |= SHOW_POLICY;
		} else if(strcmp(argv[1], "-p") == 0) {
			display_flags |= SHOW_PRIO;
		} else if(strcmp(argv[1], "-c") == 0) {
			display_flags |= SHOW_CPU;
		} else if(isdigit(argv[1][0])) {
			pidfilter = atoi(argv[1]);
		} else {
			namefilter = argv[1];
		}
		argc--;
		argv++;
	}

	if (display_flags & SHOW_MACLABEL) {
		printf("LABEL                          USER     PID   PPID  NAME\n");
	} else {
		printf("USER     PID   PPID  VSIZE  RSS   %s%s %s WCHAN    PC         NAME\n",
			(display_flags & SHOW_CPU) ? "CPU " : "",
			(display_flags & SHOW_PRIO) ? "PRIO  NICE  RTPRI SCHED " : "",
			(display_flags & SHOW_POLICY) ? "PCY " : "");
	}
	while((de = readdir(d))) {
		if(isdigit(de->d_name[0])) {
			int pid = atoi(de->d_name);
			if(!pidfilter || pidfilter == pid) {
				ps_line(pid, 0, namefilter);
				if(threads) ps_threads(pid, namefilter);
			}
		}
	}
	closedir(d);
	return 0;
}