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procps/minimal.c

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C
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/*
* Copyright 1998,2004 by Albert Cahalan; all rights reserved.
* This file may be used subject to the terms and conditions of the
* GNU Library General Public License Version 2, or any later version
* at your option, as published by the Free Software Foundation.
* 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 Library General Public License for more details.
*/
/* This is a minimal /bin/ps, designed to be smaller than the old ps
* while still supporting some of the more important features of the
* new ps. (for total size, note that this ps does not need libproc)
* It is suitable for Linux-on-a-floppy systems only.
*
* Maintainers: do not compile or install for normal systems.
* Anyone needing this will want to tweak their compiler anyway.
*/
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#ifdef __FreeBSD__
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/user.h>
#endif
#ifdef __linux__
#include <asm/param.h> /* HZ */
#include <asm/page.h> /* PAGE_SIZE */
#endif
static int P_euid;
static int P_pid;
static char P_cmd[16];
static char P_state;
static int P_ppid, P_pgrp, P_session, P_tty, P_tpgid;
static unsigned long P_flags, P_min_flt, P_cmin_flt, P_maj_flt, P_cmaj_flt, P_utime, P_stime;
static long P_cutime, P_cstime, P_priority, P_nice, P_timeout, P_alarm;
static unsigned long P_start_time, P_vsize;
static long P_rss;
static unsigned long P_rss_rlim, P_start_code, P_end_code, P_start_stack, P_kstk_esp, P_kstk_eip;
static unsigned P_signal, P_blocked, P_sigignore, P_sigcatch;
static unsigned long P_wchan, P_nswap, P_cnswap;
#if 0
static int screen_cols = 80;
static int w_count;
#endif
static int want_one_pid;
static const char *want_one_command;
static int select_notty;
static int select_all;
static int ps_format;
static int old_h_option;
/* we only pretend to support this */
static int show_args; /* implicit with -f and all BSD options */
static int bsd_c_option; /* this option overrides the above */
static int ps_argc; /* global argc */
static char **ps_argv; /* global argv */
static int thisarg; /* index into ps_argv */
static char *flagptr; /* current location in ps_argv[thisarg] */
#ifndef PAGE_SIZE
#warning PAGE_SIZE not defined, assuming it is 4096
#define PAGE_SIZE 4096
#endif
#ifndef HZ
#warning HZ not defined, assuming it is 100
#define HZ 100
#endif
static void usage(void){
fprintf(stderr,
"-C select by command name (minimal ps only accepts one)\n"
"-p select by process ID (minimal ps only accepts one)\n"
"-e all processes (same as ax)\n"
"a all processes w/ tty, including other users\n"
"x processes w/o controlling ttys\n"
"-f full format\n"
"-j,j job control format\n"
"v virtual memory format\n"
"-l,l long format\n"
"u user-oriented format\n"
"-o user-defined format (limited support, only \"ps -o pid=\")\n"
"h no header\n"
/*
"-A all processes (same as ax)\n"
"c true command name\n"
"-w,w wide output\n"
*/
);
exit(1);
}
/*
* Return the next argument, or call the usage function.
* This handles both: -oFOO -o FOO
*/
static const char *get_opt_arg(void){
const char *ret;
ret = flagptr+1; /* assume argument is part of ps_argv[thisarg] */
if(*ret) return ret;
if(++thisarg >= ps_argc) usage(); /* there is nothing left */
/* argument is the new ps_argv[thisarg] */
ret = ps_argv[thisarg];
if(!ret || !*ret) usage();
return ret;
}
/* return the PID, or 0 if nothing good */
static void parse_pid(const char *str){
char *endp;
int num;
if(!str) goto bad;
num = strtol(str, &endp, 0);
if(*endp != '\0') goto bad;
if(num<1) goto bad;
if(want_one_pid) goto bad;
want_one_pid = num;
return;
bad:
usage();
}
/***************** parse SysV options, including Unix98 *****************/
static void parse_sysv_option(void){
do{
switch(*flagptr){
/**** selection ****/
case 'C': /* end */
if(want_one_command) usage();
want_one_command = get_opt_arg();
return; /* can't have any more options */
case 'p': /* end */
parse_pid(get_opt_arg());
return; /* can't have any more options */
case 'A':
case 'e':
select_all++;
select_notty++;
case 'w': /* here for now, since the real one is not used */
break;
/**** output format ****/
case 'f':
show_args = 1;
/* FALL THROUGH */
case 'j':
case 'l':
if(ps_format) usage();
ps_format = *flagptr;
break;
case 'o': /* end */
/* We only support a limited form: "ps -o pid=" (yes, just "pid=") */
if(strcmp(get_opt_arg(),"pid=")) usage();
if(ps_format) usage();
ps_format = 'o';
old_h_option++;
return; /* can't have any more options */
/**** other stuff ****/
#if 0
case 'w':
w_count++;
break;
#endif
default:
usage();
} /* switch */
}while(*++flagptr);
}
/************************* parse BSD options **********************/
static void parse_bsd_option(void){
do{
switch(*flagptr){
/**** selection ****/
case 'a':
select_all++;
break;
case 'x':
select_notty++;
break;
case 'p': /* end */
parse_pid(get_opt_arg());
return; /* can't have any more options */
/**** output format ****/
case 'j':
case 'l':
case 'u':
case 'v':
if(ps_format) usage();
ps_format = 0x80 | *flagptr; /* use 0x80 to tell BSD from SysV */
break;
/**** other stuff ****/
case 'c':
bsd_c_option++;
#if 0
break;
#endif
case 'w':
#if 0
w_count++;
#endif
break;
case 'h':
old_h_option++;
break;
default:
usage();
} /* switch */
}while(*++flagptr);
}
#if 0
/* not used yet */
static void choose_dimensions(void){
struct winsize ws;
char *columns;
/* screen_cols is 80 by default */
if(ioctl(1, TIOCGWINSZ, &ws) != -1 && ws.ws_col>30) screen_cols = ws.ws_col;
columns = getenv("COLUMNS");
if(columns && *columns){
long t;
char *endptr;
t = strtol(columns, &endptr, 0);
if(!*endptr && (t>30) && (t<(long)999999999)) screen_cols = (int)t;
}
if(w_count && (screen_cols<132)) screen_cols=132;
if(w_count>1) screen_cols=999999999;
}
#endif
static void arg_parse(int argc, char *argv[]){
int sel = 0; /* to verify option sanity */
ps_argc = argc;
ps_argv = argv;
thisarg = 0;
/**** iterate over the args ****/
while(++thisarg < ps_argc){
flagptr = ps_argv[thisarg];
switch(*flagptr){
case '0' ... '9':
show_args = 1;
parse_pid(flagptr);
break;
case '-':
flagptr++;
parse_sysv_option();
break;
default:
show_args = 1;
parse_bsd_option();
break;
}
}
/**** sanity check and clean-up ****/
if(want_one_pid) sel++;
if(want_one_command) sel++;
if(select_notty || select_all) sel++;
if(sel>1 || select_notty>1 || select_all>1 || bsd_c_option>1 || old_h_option>1) usage();
if(bsd_c_option) show_args = 0;
}
#ifdef __FreeBSD__
/* return 1 if it works, or 0 for failure */
static int stat2proc(int pid) {
char buf[400];
int num;
int fd;
char* tmp;
int tty_maj, tty_min;
snprintf(buf, 32, "/proc/%d/status", pid);
if ( (fd = open(buf, O_RDONLY, 0) ) == -1 ) return 0;
num = read(fd, buf, sizeof buf - 1);
close(fd);
if(num<43) return 0;
buf[num] = '\0';
P_state = '-';
// FreeBSD /proc/*/status is seriously fucked. Unlike the Linux
// files, we can't use strrchr to find the end of a command name.
// Spaces in command names do not get escaped. To avoid spoofing,
// one may skip 20 characters and then look _forward_ only to
// find a pattern of entries that are {with,with,without} a comma.
// The entry without a comma is wchan. Then count backwards!
//
// Don't bother for now. FreeBSD isn't worth the trouble.
tmp = strchr(buf,' ');
num = tmp - buf;
if (num >= sizeof P_cmd) num = sizeof P_cmd - 1;
memcpy(P_cmd,buf,num);
P_cmd[num] = '\0';
num = sscanf(tmp+1,
"%d %d %d %d "
"%d,%d "
"%*s "
"%ld,%*d "
"%ld,%*d "
"%ld,%*d "
"%*s "
"%d %d ",
&P_pid, &P_ppid, &P_pgrp, &P_session,
&tty_maj, &tty_min,
/* SKIP funny flags thing */
&P_start_time, /* SKIP microseconds */
&P_utime, /* SKIP microseconds */
&P_stime, /* SKIP microseconds */
/* SKIP &P_wchan, for now -- it is a string */
&P_euid, &P_euid // don't know which is which
);
/* fprintf(stderr, "stat2proc converted %d fields.\n",num); */
// convert FreeBSD tty numbers to Linux format :-)
P_tty = ((tty_min&0xfff00)<<12) | ((tty_maj&0xfff)<<8) | (tty_min&0xff) ;
if(num < 9) return 0;
if(P_pid != pid) return 0;
return 1;
}
#endif
#ifdef __linux__
/* return 1 if it works, or 0 for failure */
static int stat2proc(int pid) {
char buf[800]; /* about 40 fields, 64-bit decimal is about 20 chars */
int num;
int fd;
char* tmp;
struct stat sb; /* stat() used to get EUID */
snprintf(buf, 32, "/proc/%d/stat", pid);
if ( (fd = open(buf, O_RDONLY, 0) ) == -1 ) return 0;
num = read(fd, buf, sizeof buf - 1);
fstat(fd, &sb);
P_euid = sb.st_uid;
close(fd);
if(num<80) return 0;
buf[num] = '\0';
tmp = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
*tmp = '\0'; /* replace trailing ')' with NUL */
/* parse these two strings separately, skipping the leading "(". */
memset(P_cmd, 0, sizeof P_cmd); /* clear */
sscanf(buf, "%d (%15c", &P_pid, P_cmd); /* comm[16] in kernel */
num = sscanf(tmp + 2, /* skip space after ')' too */
"%c "
"%d %d %d %d %d "
"%lu %lu %lu %lu %lu %lu %lu "
"%ld %ld %ld %ld %ld %ld "
"%lu %lu "
"%ld "
"%lu %lu %lu %lu %lu %lu "
"%u %u %u %u " /* no use for RT signals */
"%lu %lu %lu",
&P_state,
&P_ppid, &P_pgrp, &P_session, &P_tty, &P_tpgid,
&P_flags, &P_min_flt, &P_cmin_flt, &P_maj_flt, &P_cmaj_flt, &P_utime, &P_stime,
&P_cutime, &P_cstime, &P_priority, &P_nice, &P_timeout, &P_alarm,
&P_start_time, &P_vsize,
&P_rss,
&P_rss_rlim, &P_start_code, &P_end_code, &P_start_stack, &P_kstk_esp, &P_kstk_eip,
&P_signal, &P_blocked, &P_sigignore, &P_sigcatch,
&P_wchan, &P_nswap, &P_cnswap
);
/* fprintf(stderr, "stat2proc converted %d fields.\n",num); */
P_vsize /= 1024;
P_rss *= (PAGE_SIZE/1024);
if(num < 30) return 0;
if(P_pid != pid) return 0;
return 1;
}
#endif
static const char *do_time(unsigned long t){
int hh,mm,ss;
static char buf[32];
int cnt = 0;
t /= HZ;
ss = t%60;
t /= 60;
mm = t%60;
t /= 60;
hh = t%24;
t /= 24;
if(t) cnt = snprintf(buf, sizeof buf, "%d-", (int)t);
snprintf(cnt + buf, sizeof(buf)-cnt, "%02d:%02d:%02d", hh, mm, ss);
return buf;
}
static const char *do_user(void){
static char buf[32];
static struct passwd *p;
static int lastuid = -1;
if(P_euid != lastuid){
p = getpwuid(P_euid);
if(p) snprintf(buf, sizeof buf, "%-8.8s", p->pw_name);
else snprintf(buf, sizeof buf, "%5d ", P_euid);
}
return buf;
}
static const char *do_cpu(int longform){
static char buf[8];
strcpy(buf," - ");
if(!longform) buf[2] = '\0';
return buf;
}
static const char *do_mem(int longform){
static char buf[8];
strcpy(buf," - ");
if(!longform) buf[2] = '\0';
return buf;
}
static const char *do_stime(void){
static char buf[32];
strcpy(buf," - ");
return buf;
}
static void print_proc(void){
char tty[16];
snprintf(tty, sizeof tty, "%3d,%-3d", (P_tty>>8)&0xfff, (P_tty&0xff) | ((P_tty>>12)&0xfff00));
switch(ps_format){
case 0:
printf("%5d %s %s", P_pid, tty, do_time(P_utime+P_stime));
break;
case 'o':
printf("%d\n", P_pid);
return; /* don't want the command */
case 'l':
printf(
"0 %c %5d %5d %5d %s %3d %3d - "
"%5ld %06x %s %s",
P_state, P_euid, P_pid, P_ppid, do_cpu(0),
(int)P_priority, (int)P_nice, P_vsize/(PAGE_SIZE/1024),
(unsigned)(P_wchan&0xffffff), tty, do_time(P_utime+P_stime)
);
break;
case 'f':
printf(
"%8s %5d %5d %s %s %s %s",
do_user(), P_pid, P_ppid, do_cpu(0), do_stime(), tty, do_time(P_utime+P_stime)
);
break;
case 'j':
printf(
"%5d %5d %5d %s %s",
P_pid, P_pgrp, P_session, tty, do_time(P_utime+P_stime)
);
break;
case 'u'|0x80:
printf(
"%8s %5d %s %s %5ld %4ld %s %c %s %s",
do_user(), P_pid, do_cpu(1), do_mem(1), P_vsize, P_rss, tty, P_state,
do_stime(), do_time(P_utime+P_stime)
);
break;
case 'v'|0x80:
printf(
"%5d %s %c %s %6d - - %5d %s",
P_pid, tty, P_state, do_time(P_utime+P_stime), (int)P_maj_flt,
(int)P_rss, do_mem(1)
);
break;
case 'j'|0x80:
printf(
"%5d %5d %5d %5d %s %5d %c %5d %s",
P_ppid, P_pid, P_pgrp, P_session, tty, P_tpgid, P_state, P_euid, do_time(P_utime+P_stime)
);
break;
case 'l'|0x80:
printf(
"0 %5d %5d %5d %3d %3d "
"%5ld %4ld %06x %c %s %s",
P_euid, P_pid, P_ppid, (int)P_priority, (int)P_nice,
P_vsize, P_rss, (unsigned)(P_wchan&0xffffff), P_state, tty, do_time(P_utime+P_stime)
);
break;
default:
;
}
if(show_args) printf(" [%s]\n", P_cmd);
else printf(" %s\n", P_cmd);
}
int main(int argc, char *argv[]){
arg_parse(argc, argv);
#if 0
choose_dimensions();
#endif
if(!old_h_option){
const char *head;
switch(ps_format){
default: /* can't happen */
case 0: head = " PID TTY TIME CMD"; break;
case 'l': head = "F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD"; break;
case 'f': head = "USER PID PPID C STIME TTY TIME CMD"; break;
case 'j': head = " PID PGID SID TTY TIME CMD"; break;
case 'u'|0x80: head = "USER PID %CPU %MEM VSZ RSS TTY S START TIME COMMAND"; break;
case 'v'|0x80: head = " PID TTY S TIME MAJFL TRS DRS RSS %MEM COMMAND"; break;
case 'j'|0x80: head = " PPID PID PGID SID TTY TPGID S UID TIME COMMAND"; break;
case 'l'|0x80: head = "F UID PID PPID PRI NI VSZ RSS WCHAN S TTY TIME COMMAND"; break;
}
printf("%s\n",head);
}
if(want_one_pid){
if(stat2proc(want_one_pid)) print_proc();
else exit(1);
}else{
struct dirent *ent; /* dirent handle */
DIR *dir;
int ouruid;
int found_a_proc;
found_a_proc = 0;
ouruid = getuid();
dir = opendir("/proc");
while(( ent = readdir(dir) )){
if(*ent->d_name<'0' || *ent->d_name>'9') continue;
if(!stat2proc(atoi(ent->d_name))) continue;
if(want_one_command){
if(strcmp(want_one_command,P_cmd)) continue;
}else{
if(!select_notty && P_tty==-1) continue;
if(!select_all && P_euid!=ouruid) continue;
}
found_a_proc++;
print_proc();
}
closedir(dir);
exit(!found_a_proc);
}
return 0;
}
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