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minix/commands/ps/ps.c
Ben Gras edb541fb98 Display "select" blocking status correctly, and add check for wrong 
blocking process number
2005-11-02 17:43:19 +00:00

604 lines
18 KiB
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/* ps - print status Author: Peter Valkenburg */
/* Ps.c, Peter Valkenburg (valke@psy.vu.nl), january 1990.
*
* This is a V7 ps(1) look-alike for MINIX >= 1.5.0.
* It does not support the 'k' option (i.e. cannot read memory from core file).
* If you want to compile this for non-IBM PC architectures, the header files
* require that you have your CHIP, MACHINE etc. defined.
* Full syntax:
* ps [-][aeflx]
* Option `a' gives all processes, `l' for detailed info, `x' includes even
* processes without a terminal.
* The `f' and `e' options were added by Kees Bot for the convenience of
* Solaris users accustomed to these options. The `e' option is equivalent to
* `a' and `f' is equivalent to -l. These do not appear in the usage message.
*
* VERY IMPORTANT NOTE:
* To compile ps, the kernel/, fs/ and pm/ source directories must be in
* ../../ relative to the directory where ps is compiled (normally the
* tools source directory).
*
* If you want your ps to be useable by anyone, you can arrange the
* following access permissions (note the protected memory files and set
* *group* id on ps):
* -rwxr-sr-x 1 bin kmem 11916 Jul 4 15:31 /bin/ps
* crw-r----- 1 bin kmem 1, 1 Jan 1 1970 /dev/mem
* crw-r----- 1 bin kmem 1, 2 Jan 1 1970 /dev/kmem
*/
/* Some technical comments on this implementation:
*
* Most fields are similar to V7 ps(1), except for CPU, NICE, PRI which are
* absent, RECV which replaces WCHAN, and PGRP that is an extra.
* The info is obtained from the following fields of proc, mproc and fproc:
* F - kernel status field, p_rts_flags
* S - kernel status field, p_rts_flags; mm status field, mp_flags (R if p_rts_flags
* is 0; Z if mp_flags == ZOMBIE; T if mp_flags == STOPPED; else W).
* UID - mm eff uid field, mp_effuid
* PID - mm pid field, mp_pid
* PPID - mm parent process index field, mp_parent (used as index in proc).
* PGRP - mm process group field, mp_procgrp
* SZ - kernel text size + physical stack address - physical data address
* + stack size
* p_memmap[T].mem_len + p_memmap[S].mem_phys - p_memmap[D].mem_phys
* + p_memmap[S].mem_len
* RECV - kernel process index field for message receiving, p_getfrom
* If sleeping, mm's mp_flags, or fs's fp_task are used for more info.
* TTY - fs controlling tty device field, fp_tty.
* TIME - kernel user + system times fields, user_time + sys_time
* CMD - system process index (converted to mnemonic name by using the p_name
* field), or user process argument list (obtained by reading the stack
* frame; the resulting address is used to get the argument vector from
* user space and converted into a concatenated argument list).
*/
#include <minix/config.h>
#include <limits.h>
#include <timers.h>
#include <sys/types.h>
#include <minix/const.h>
#include <minix/type.h>
#include <minix/ipc.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <minix/com.h>
#include <fcntl.h>
#include <a.out.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <signal.h>
#include <stdio.h>
#include <ttyent.h>
#include "../../kernel/const.h"
#include "../../kernel/type.h"
#include "../../kernel/proc.h"
#include "../../servers/pm/mproc.h"
#include "../../servers/fs/fproc.h"
#include "../../servers/fs/const.h"
/*----- ps's local stuff below this line ------*/
#define mindev(dev) (((dev)>>MINOR) & 0377) /* yield minor device */
#define majdev(dev) (((dev)>>MAJOR) & 0377) /* yield major device */
#define TTY_MAJ 4 /* major device of console */
/* Structure for tty name info. */
typedef struct {
char tty_name[NAME_MAX + 1]; /* file name in /dev */
dev_t tty_dev; /* major/minor pair */
} ttyinfo_t;
ttyinfo_t *ttyinfo; /* ttyinfo holds actual tty info */
size_t n_ttyinfo; /* Number of tty info slots */
/* Macro to convert memory offsets to rounded kilo-units */
#define off_to_k(off) ((unsigned) (((off) + 512) / 1024))
/* Number of tasks and processes and addresses of the main process tables. */
int nr_tasks, nr_procs;
vir_bytes proc_addr, mproc_addr, fproc_addr;
extern int errno;
/* Process tables of the kernel, MM, and FS. */
struct proc *ps_proc;
struct mproc *ps_mproc;
struct fproc *ps_fproc;
/* Where is INIT? */
int init_proc_nr;
#define low_user init_proc_nr
#define KMEM_PATH "/dev/kmem" /* opened for kernel proc table */
#define MEM_PATH "/dev/mem" /* opened for pm/fs + user processes */
int kmemfd, memfd; /* file descriptors of [k]mem */
/* Short and long listing formats:
*
* PID TTY TIME CMD
* ppppp tttmmm:ss cccccccccc...
*
* F S UID PID PPID PGRP SZ RECV TTY TIME CMD
* fff s uuu ppppp ppppp ppppp ssss rrrrrrrrrr tttmmm:ss cccccccc...
*/
#define S_HEADER " PID TTY TIME CMD\n"
#define S_FORMAT "%5s %3s %s %s\n"
#define L_HEADER " F S UID PID PPID PGRP SZ RECV TTY TIME CMD\n"
#define L_FORMAT "%3o %c %3d %5s %5d %5d %6d %12s %3s %s %s\n"
struct pstat { /* structure filled by pstat() */
dev_t ps_dev; /* major/minor of controlling tty */
uid_t ps_ruid; /* real uid */
uid_t ps_euid; /* effective uid */
pid_t ps_pid; /* process id */
pid_t ps_ppid; /* parent process id */
int ps_pgrp; /* process group id */
int ps_flags; /* kernel flags */
int ps_mflags; /* mm flags */
int ps_ftask; /* (possibly pseudo) fs suspend task */
char ps_state; /* process state */
vir_bytes ps_tsize; /* text size (in bytes) */
vir_bytes ps_dsize; /* data size (in bytes) */
vir_bytes ps_ssize; /* stack size (in bytes) */
phys_bytes ps_vtext; /* virtual text offset */
phys_bytes ps_vdata; /* virtual data offset */
phys_bytes ps_vstack; /* virtual stack offset */
phys_bytes ps_text; /* physical text offset */
phys_bytes ps_data; /* physical data offset */
phys_bytes ps_stack; /* physical stack offset */
int ps_recv; /* process number to receive from */
time_t ps_utime; /* accumulated user time */
time_t ps_stime; /* accumulated system time */
char *ps_args; /* concatenated argument string */
vir_bytes ps_procargs; /* initial stack frame from MM */
};
/* Ps_state field values in pstat struct above */
#define Z_STATE 'Z' /* Zombie */
#define W_STATE 'W' /* Waiting */
#define S_STATE 'S' /* Sleeping */
#define R_STATE 'R' /* Runnable */
#define T_STATE 'T' /* stopped (Trace) */
_PROTOTYPE(char *tname, (Dev_t dev_nr ));
_PROTOTYPE(char *taskname, (int p_nr ));
_PROTOTYPE(char *prrecv, (struct pstat *bufp ));
_PROTOTYPE(void disaster, (int sig ));
_PROTOTYPE(int main, (int argc, char *argv []));
_PROTOTYPE(char *get_args, (struct pstat *bufp ));
_PROTOTYPE(int pstat, (int p_nr, struct pstat *bufp ));
_PROTOTYPE(int addrread, (int fd, phys_clicks base, vir_bytes addr,
char *buf, int nbytes ));
_PROTOTYPE(void usage, (char *pname ));
_PROTOTYPE(void err, (char *s ));
_PROTOTYPE(int gettynames, (void));
/*
* Tname returns mnemonic string for dev_nr. This is "?" for maj/min pairs that
* are not found. It uses the ttyinfo array (prepared by gettynames).
* Tname assumes that the first three letters of the tty's name can be omitted
* and returns the rest (except for the console, which yields "co").
*/
char *tname(dev_nr)
Dev_t dev_nr;
{
int i;
if (majdev(dev_nr) == TTY_MAJ && mindev(dev_nr) == 0) return "co";
for (i = 0; i < n_ttyinfo && ttyinfo[i].tty_name[0] != '\0'; i++)
if (ttyinfo[i].tty_dev == dev_nr)
return ttyinfo[i].tty_name + 3;
return "?";
}
/* Return canonical task name of task p_nr; overwritten on each call (yucch) */
char *taskname(p_nr)
int p_nr;
{
return ps_proc[p_nr + nr_tasks].p_name;
}
/* Prrecv prints the RECV field for process with pstat buffer pointer bufp.
* This is either "ANY", "taskname", or "(blockreason) taskname".
*/
char *prrecv(bufp)
struct pstat *bufp;
{
char *blkstr, *task; /* reason for blocking and task */
static char recvstr[20];
if (bufp->ps_recv == ANY) return "ANY";
task = taskname(bufp->ps_recv);
if (bufp->ps_state != S_STATE) return task;
blkstr = "?";
if (bufp->ps_recv == PM_PROC_NR) {
if (bufp->ps_mflags & PAUSED)
blkstr = "pause";
else if (bufp->ps_mflags & WAITING)
blkstr = "wait";
else if (bufp->ps_mflags & SIGSUSPENDED)
blkstr = "ssusp";
} else if (bufp->ps_recv == FS_PROC_NR) {
if (-bufp->ps_ftask == XPIPE)
blkstr = "pipe";
else if (-bufp->ps_ftask == XPOPEN)
blkstr = "popen";
else if (-bufp->ps_ftask == XLOCK)
blkstr = "flock";
else if(-bufp->ps_ftask == XSELECT)
blkstr = "select";
else if(-bufp->ps_ftask >= 0)
blkstr = taskname(-bufp->ps_ftask);
else
blkstr = "??";
}
(void) sprintf(recvstr, "(%s) %s", blkstr, task);
return recvstr;
}
/* If disaster is called some of the system parameters imported into ps are
* probably wrong. This tends to result in memory faults.
*/
void disaster(sig)
int sig;
{
fprintf(stderr, "Ooops, got signal %d\n", sig);
fprintf(stderr, "Was ps recompiled since the last kernel change?\n");
exit(3);
}
/* Main interprets arguments, gets system addresses, opens [k]mem, reads in
* process tables from kernel/pm/fs and calls pstat() for relevant entries.
*/
int main(argc, argv)
int argc;
char *argv[];
{
int i;
struct pstat buf;
int db_fd;
int uid = getuid(); /* real uid of caller */
char *opt;
int opt_all = FALSE; /* -a */
int opt_long = FALSE; /* -l */
int opt_notty = FALSE; /* -x */
char *ke_path; /* paths of kernel, */
char *mm_path; /* mm, */
char *fs_path; /* and fs used in ps -U */
char pid[2 + sizeof(pid_t) * 3];
unsigned long ustime;
char cpu[sizeof(clock_t) * 3 + 1 + 2];
struct kinfo kinfo;
int s;
(void) signal(SIGSEGV, disaster); /* catch a common crash */
/* Parse arguments; a '-' need not be present (V7/BSD compatability) */
for (i = 1; i < argc; i++) {
opt = argv[i];
if (opt[0] == '-') opt++;
while (*opt != 0) switch (*opt++) {
case 'a': opt_all = TRUE; break;
case 'e': opt_all = opt_notty = TRUE; break;
case 'f':
case 'l': opt_long = TRUE; break;
case 'x': opt_notty = TRUE; break;
default: usage(argv[0]);
}
}
/* Open memory devices and get PS info from the kernel */
if ((kmemfd = open(KMEM_PATH, O_RDONLY)) == -1) err(KMEM_PATH);
if ((memfd = open(MEM_PATH, O_RDONLY)) == -1) err(MEM_PATH);
if (gettynames() == -1) err("Can't get tty names");
getsysinfo(PM_PROC_NR, SI_PROC_ADDR, &mproc_addr);
getsysinfo(FS_PROC_NR, SI_PROC_ADDR, &fproc_addr);
getsysinfo(PM_PROC_NR, SI_KINFO, &kinfo);
proc_addr = kinfo.proc_addr;
nr_tasks = kinfo.nr_tasks;
nr_procs = kinfo.nr_procs;
/* Allocate memory for process tables */
ps_proc = (struct proc *) malloc((nr_tasks + nr_procs) * sizeof(ps_proc[0]));
ps_mproc = (struct mproc *) malloc(nr_procs * sizeof(ps_mproc[0]));
ps_fproc = (struct fproc *) malloc(nr_procs * sizeof(ps_fproc[0]));
if (ps_proc == NULL || ps_mproc == NULL || ps_fproc == NULL)
err("Out of memory");
/* Get kernel process table */
if (addrread(kmemfd, (phys_clicks) 0,
proc_addr, (char *) ps_proc,
(nr_tasks + nr_procs) * sizeof(ps_proc[0]))
!= (nr_tasks + nr_procs) * sizeof(ps_proc[0]))
err("Can't get kernel proc table from /dev/kmem");
/* Get mm/fs process tables */
if (addrread(memfd, ps_proc[nr_tasks + PM_PROC_NR].p_memmap[D].mem_phys,
mproc_addr, (char *) ps_mproc,
nr_procs * sizeof(ps_mproc[0]))
!= nr_procs * sizeof(ps_mproc[0]))
err("Can't get mm proc table from /dev/mem");
if (addrread(memfd, ps_proc[nr_tasks + FS_PROC_NR].p_memmap[D].mem_phys,
fproc_addr, (char *) ps_fproc,
nr_procs * sizeof(ps_fproc[0]))
!= nr_procs * sizeof(ps_fproc[0]))
err("Can't get fs proc table from /dev/mem");
/* We need to know where INIT hangs out. */
for (i = FS_PROC_NR; i < nr_procs; i++) {
if (strcmp(ps_proc[nr_tasks + i].p_name, "init") == 0) break;
}
init_proc_nr = i;
/* Now loop through process table and handle each entry */
printf("%s", opt_long ? L_HEADER : S_HEADER);
for (i = -nr_tasks; i < nr_procs; i++) {
if (pstat(i, &buf) != -1 &&
(opt_all || buf.ps_euid == uid || buf.ps_ruid == uid) &&
(opt_notty || majdev(buf.ps_dev) == TTY_MAJ)) {
if (buf.ps_pid == 0 && i != PM_PROC_NR) {
sprintf(pid, "(%d)", i);
} else {
sprintf(pid, "%d", buf.ps_pid);
}
ustime = (buf.ps_utime + buf.ps_stime) / HZ;
if (ustime < 60 * 60) {
sprintf(cpu, "%2lu:%02lu", ustime / 60, ustime % 60);
} else
if (ustime < 100L * 60 * 60) {
ustime /= 60;
sprintf(cpu, "%2luh%02lu", ustime / 60, ustime % 60);
} else {
sprintf(cpu, "%4luh", ustime / 3600);
}
if (opt_long) printf(L_FORMAT,
buf.ps_flags, buf.ps_state,
buf.ps_euid, pid, buf.ps_ppid,
buf.ps_pgrp,
off_to_k((buf.ps_tsize
+ buf.ps_stack - buf.ps_data
+ buf.ps_ssize)),
(buf.ps_flags & RECEIVING ?
prrecv(&buf) :
""),
tname((Dev_t) buf.ps_dev),
cpu,
i <= init_proc_nr || buf.ps_args == NULL
? taskname(i) : buf.ps_args);
else
printf(S_FORMAT,
pid, tname((Dev_t) buf.ps_dev),
cpu,
i <= init_proc_nr || buf.ps_args == NULL
? taskname(i) : buf.ps_args);
}
}
return(0);
}
char *get_args(bufp)
struct pstat *bufp;
{
int nargv;
int cnt; /* # of bytes read from stack frame */
int neos; /* # of '\0's seen in argv string space */
phys_bytes iframe;
long l;
char *cp, *args;
static union stack {
vir_bytes stk_i;
char *stk_cp;
char stk_c;
} stk[ARG_MAX / sizeof(char *)];
union stack *sp;
/* Phys address of the original stack frame. */
iframe = bufp->ps_procargs - bufp->ps_vstack + bufp->ps_stack;
/* Calculate the number of bytes to read from user stack */
l = (phys_bytes) bufp->ps_ssize - (iframe - bufp->ps_stack);
if (l > ARG_MAX) l = ARG_MAX;
cnt = l;
/* Get cnt bytes from user initial stack to local stack buffer */
if (lseek(memfd, (off_t) iframe, 0) < 0)
return NULL;
if ( read(memfd, (char *)stk, cnt) != cnt )
return NULL;
sp = stk;
nargv = (int) sp[0].stk_i; /* number of argv arguments */
/* See if argv[0] is with the bytes we read in */
l = (long) sp[1].stk_cp - (long) bufp->ps_procargs;
if ( ( l < 0 ) || ( l > cnt ) )
return NULL;
/* l is the offset of the argv[0] argument */
/* change for concatenation the '\0' to space, for nargv elements */
args = &((char *) stk)[(int)l];
neos = 0;
for (cp = args; cp < &((char *) stk)[cnt]; cp++)
if (*cp == '\0')
if (++neos >= nargv)
break;
else
*cp = ' ';
if (cp == args) return NULL;
*cp = '\0';
return args;
}
/* Pstat collects info on process number p_nr and returns it in buf.
* It is assumed that tasks do not have entries in fproc/mproc.
*/
int pstat(p_nr, bufp)
int p_nr;
struct pstat *bufp;
{
int p_ki = p_nr + nr_tasks; /* kernel proc index */
if (p_nr < -nr_tasks || p_nr >= nr_procs) return -1;
if ((ps_proc[p_ki].p_rts_flags == SLOT_FREE)
&& !(ps_mproc[p_nr].mp_flags & IN_USE))
return -1;
bufp->ps_flags = ps_proc[p_ki].p_rts_flags;
if (p_nr >= low_user) {
bufp->ps_dev = ps_fproc[p_nr].fp_tty;
bufp->ps_ftask = ps_fproc[p_nr].fp_task;
} else {
bufp->ps_dev = 0;
bufp->ps_ftask = 0;
}
if (p_nr >= 0) {
bufp->ps_ruid = ps_mproc[p_nr].mp_realuid;
bufp->ps_euid = ps_mproc[p_nr].mp_effuid;
bufp->ps_pid = ps_mproc[p_nr].mp_pid;
bufp->ps_ppid = ps_mproc[ps_mproc[p_nr].mp_parent].mp_pid;
bufp->ps_pgrp = ps_mproc[p_nr].mp_procgrp;
bufp->ps_mflags = ps_mproc[p_nr].mp_flags;
} else {
bufp->ps_pid = 0;
bufp->ps_ppid = 0;
bufp->ps_ruid = bufp->ps_euid = 0;
bufp->ps_pgrp = 0;
bufp->ps_mflags = 0;
}
/* State is interpretation of combined kernel/mm flags for non-tasks */
if (p_nr >= low_user) { /* non-tasks */
if (ps_mproc[p_nr].mp_flags & ZOMBIE)
bufp->ps_state = Z_STATE; /* zombie */
else if (ps_mproc[p_nr].mp_flags & STOPPED)
bufp->ps_state = T_STATE; /* stopped (traced) */
else if (ps_proc[p_ki].p_rts_flags == 0)
bufp->ps_state = R_STATE; /* in run-queue */
else if (ps_mproc[p_nr].mp_flags & (WAITING | PAUSED | SIGSUSPENDED) ||
ps_fproc[p_nr].fp_suspended == SUSPENDED)
bufp->ps_state = S_STATE; /* sleeping */
else
bufp->ps_state = W_STATE; /* a short wait */
} else { /* tasks are simple */
if (ps_proc[p_ki].p_rts_flags == 0)
bufp->ps_state = R_STATE; /* in run-queue */
else
bufp->ps_state = W_STATE; /* other i.e. waiting */
}
bufp->ps_tsize = (size_t) ps_proc[p_ki].p_memmap[T].mem_len << CLICK_SHIFT;
bufp->ps_dsize = (size_t) ps_proc[p_ki].p_memmap[D].mem_len << CLICK_SHIFT;
bufp->ps_ssize = (size_t) ps_proc[p_ki].p_memmap[S].mem_len << CLICK_SHIFT;
bufp->ps_vtext = (off_t) ps_proc[p_ki].p_memmap[T].mem_vir << CLICK_SHIFT;
bufp->ps_vdata = (off_t) ps_proc[p_ki].p_memmap[D].mem_vir << CLICK_SHIFT;
bufp->ps_vstack = (off_t) ps_proc[p_ki].p_memmap[S].mem_vir << CLICK_SHIFT;
bufp->ps_text = (off_t) ps_proc[p_ki].p_memmap[T].mem_phys << CLICK_SHIFT;
bufp->ps_data = (off_t) ps_proc[p_ki].p_memmap[D].mem_phys << CLICK_SHIFT;
bufp->ps_stack = (off_t) ps_proc[p_ki].p_memmap[S].mem_phys << CLICK_SHIFT;
bufp->ps_recv = ps_proc[p_ki].p_getfrom;
bufp->ps_utime = ps_proc[p_ki].p_user_time;
bufp->ps_stime = ps_proc[p_ki].p_sys_time;
bufp->ps_procargs = ps_mproc[p_nr].mp_procargs;
if (bufp->ps_state == Z_STATE)
bufp->ps_args = "<defunct>";
else if (p_nr > init_proc_nr)
bufp->ps_args = get_args(bufp);
return 0;
}
/* Addrread reads nbytes from offset addr to click base of fd into buf. */
int addrread(fd, base, addr, buf, nbytes)
int fd;
phys_clicks base;
vir_bytes addr;
char *buf;
int nbytes;
{
if (lseek(fd, ((off_t) base << CLICK_SHIFT) + addr, 0) < 0)
return -1;
return read(fd, buf, nbytes);
}
void usage(pname)
char *pname;
{
fprintf(stderr, "Usage: %s [-][aeflx]\n", pname);
exit(1);
}
void err(s)
char *s;
{
extern int errno;
if (errno == 0)
fprintf(stderr, "ps: %s\n", s);
else
fprintf(stderr, "ps: %s: %s\n", s, strerror(errno));
exit(2);
}
/* Fill ttyinfo by fstatting character specials in /dev. */
int gettynames()
{
static char dev_path[] = "/dev/";
struct stat statbuf;
static char path[sizeof(dev_path) + NAME_MAX];
int index;
struct ttyent *ttyp;
index = 0;
while ((ttyp = getttyent()) != NULL) {
strcpy(path, dev_path);
strcat(path, ttyp->ty_name);
if (stat(path, &statbuf) == -1 || !S_ISCHR(statbuf.st_mode))
continue;
if (index >= n_ttyinfo) {
n_ttyinfo= (index+16) * 2;
ttyinfo = realloc(ttyinfo, n_ttyinfo * sizeof(ttyinfo[0]));
if (ttyinfo == NULL) err("Out of memory");
}
ttyinfo[index].tty_dev = statbuf.st_rdev;
strcpy(ttyinfo[index].tty_name, ttyp->ty_name);
index++;
}
endttyent();
while (index < n_ttyinfo) ttyinfo[index++].tty_dev= 0;
return 0;
}
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