dan@msdc.UUCP (Dan Forsyth) (09/07/85)
For those of you who like to fool with long files, here is a
modification to "ps" that shows the position of open files. I find it
incredibly useful to spy on huge processes (we have a few whose
run-times are measured in cpu-days).
It is a modification of the "ps" in the BRL version of 4.2bsd for the VAX.
Unfortunately, I don't have an original 4.2bsd release on-line, so I
can't tell you whether the patches will apply cleanly. Since it so
closely resembles the 4.1 "ps" for which it was originally written, I
assume that they will be pretty close. For versions that use
"/etc/psdatabase", you'll want to compile with "PSFILE=somethingelse"
since these mods change its contents.
The following are two context diffs that should be easily applied with
Larry Wall's "patch" program. Just put "ps.c" and "ps.1" in a
directory and run this article through patch.
Please, no flames about programming style, etc. I tried to make the
mods in the same (nasty) style as the original. To those of you
running System V.*, my apologies; I don't have a SV native system to
play with. If it's deemed useful, maybe some charitable SV user
will convert it.
Dan Forsyth ({akgua,gatech,mcnc,ihnp4}!msdc!dan)
Medical Systems Development Corporation, Atlanta, GA
*** ps.1 Wed Sep 4 19:22:02 1985
--- ps.1.new Wed Sep 4 19:47:56 1985
***************
*** 5,11
.SH SYNOPSIS
.B ps
[
! .B acegklstuvwxU#
]
.SH DESCRIPTION
.I Ps
--- 5,11 -----
.SH SYNOPSIS
.B ps
[
! .B acefgklstuvwxU#
]
.SH DESCRIPTION
.I Ps
***************
*** 66,71
.B e
Asks for the environment to be printed as well as the arguments to the command.
.TP 5
.B g
Asks for all processes.
Without this option,
--- 66,79 -----
.B e
Asks for the environment to be printed as well as the arguments to the command.
.TP 5
+ .B f
+ Shows information about each process' open files after the process
+ display line. The display
+ consists of one line per open file, so output is voluminous for many
+ processes. Information from both the file table and inode table
+ is shown for each file. Items shown are
+ FD, DEV, INUM, IFLAG, CT, SIZE/DEV, POS, and FFLAG.
+ .TP 5
.B g
Asks for all processes.
Without this option,
***************
*** 229,234
SDETACH 080000 detached inherited by init
SOUSIG 100000 using old signal mechanism
.fi
.PD
.PP
A process that has exited and has a parent, but has not
--- 237,270 -----
SDETACH 080000 detached inherited by init
SOUSIG 100000 using old signal mechanism
.fi
+ .IP FD 10
+ The file descriptor number open to the process.
+ .IP DEV 10
+ The device number on which the open inode resides. (Not included for
+ sockets.)
+ .IP INUM 10
+ The i-number of the open inode.
+ (Not included for sockets.)
+ .IP IFLAG 10
+ The flags currently set in the inode (see <sys/inode.h>). Flags are
+ L for ILOCKED, U for IUPD, A for IADD, N for IMOUNT, W for IWANT,
+ T for ITEXT, C for ICHG, S for ISHLOCK, E for IEXLOCK, C for ILWAIT,
+ M for IMOD, R for IRENAME, and X for IXMOD.
+ (Not included for sockets.)
+ .IP CT 10
+ The current user count of the inode.
+ (Not included for sockets.)
+ .IP SIZE/DEV 10
+ For files, the current file size; for devices, the device numbers.
+ (Not included for sockets.)
+ .IP POS 10
+ The offset in the file table entry for the file.
+ .IP FFLAG 10
+ The flags in the file table entry (see <sys/file.h>). Flags are
+ R for FREAD, W for FWRITE, M for FMARK, D for FDEFER, S for FSHLOCK,
+ and E for FEXLOCK.
+ The P flag
+ is included for sockets.
.PD
.PP
A process that has exited and has a parent, but has not
***************
*** 261,263
.I ps
is running; the picture it gives is only a close
approximation to reality.
--- 297,304 -----
.I ps
is running; the picture it gives is only a close
approximation to reality.
+ .PP
+ It would be nice if the
+ .B f
+ format could list the path names of open files. However, i-numbers
+ are better than nothing.
*** /usr/src/bin/ps.c Fri Jan 11 23:56:39 1985
--- /usr/dan/bin/src/ps.c Sun Aug 25 11:09:58 1985
***************
*** 39,44
#include <sys/vm.h>
#include <sys/text.h>
#include <sys/stat.h>
#include <sys/mbuf.h>
#include <math.h>
#include <errno.h>
--- 39,48 -----
#include <sys/vm.h>
#include <sys/text.h>
#include <sys/stat.h>
+ #include <sys/inode.h>
+ #define KERNEL /* somebody screwed up the header file */
+ #include <sys/file.h>
+ #undef KERNEL
#include <sys/mbuf.h>
#include <math.h>
#include <errno.h>
***************
*** 68,73
#define X_DMMIN 10
{ "_dmmax" },
#define X_DMMAX 11
{ "_Sysmap" },
#define X_SYSMAP 12
{ "_Syssize" },
--- 72,85 -----
#define X_DMMIN 10
{ "_dmmax" },
#define X_DMMAX 11
+ { "_file" },
+ #define X_FILE 12
+ { "_nfile" },
+ #define X_NFILE 13
+ {"_inode" },
+ #define X_INODE 14
+ {"_ninode" },
+ #define X_NINODE 15
{ "_Sysmap" },
#define X_SYSMAP 16
{ "_Syssize" },
***************
*** 69,75
{ "_dmmax" },
#define X_DMMAX 11
{ "_Sysmap" },
! #define X_SYSMAP 12
{ "_Syssize" },
#define X_SYSSIZE 13
{ "" },
--- 81,87 -----
{"_ninode" },
#define X_NINODE 15
{ "_Sysmap" },
! #define X_SYSMAP 16
{ "_Syssize" },
#define X_SYSSIZE 17
{ "" },
***************
*** 71,77
{ "_Sysmap" },
#define X_SYSMAP 12
{ "_Syssize" },
! #define X_SYSSIZE 13
{ "" },
};
--- 83,89 -----
{ "_Sysmap" },
#define X_SYSMAP 16
{ "_Syssize" },
! #define X_SYSSIZE 17
{ "" },
};
***************
*** 82,87
struct vsav *vp;
int s_ssiz;
} s_un;
struct asav *ap;
} *savcom;
--- 94,100 -----
struct vsav *vp;
int s_ssiz;
} s_un;
+ struct fsav *fp;
struct asav *ap;
} *savcom;
***************
*** 97,102
size_t a_maxrss;
};
char *lhdr;
struct lsav {
short l_ppid;
--- 110,128 -----
size_t a_maxrss;
};
+ struct fsav {
+ u_short f_dev;
+ u_short f_ino;
+ u_short f_flag;
+ u_short f_count;
+ int f_size;
+ u_short f_type;
+ int f_offset;
+ u_short f_rwflag;
+ u_short f_mode;
+ };
+
+
char *lhdr;
struct lsav {
short l_ppid;
***************
*** 107,112
char *uhdr;
char *shdr;
char *vhdr;
struct vsav {
--- 133,139 -----
char *uhdr;
char *shdr;
+ char *fhdr;
char *vhdr;
struct vsav {
***************
*** 134,140
#endif
int chkpid;
! int aflg, cflg, eflg, gflg, kflg, lflg, sflg,
uflg, vflg, xflg, Uflg;
char *tptr;
char *gettty(), *getcmd(), *getname(), *savestr(), *state();
--- 161,167 -----
#endif
int chkpid;
! int aflg, cflg, eflg, fflg, gflg, kflg, lflg, sflg,
uflg, vflg, xflg, Uflg;
char *tptr;
char *gettty(), *getcmd(), *getname(), *savestr(), *state();
***************
*** 148,153
struct text *atext;
double ccpu;
int ecmx;
struct pte *Usrptmap, *usrpt;
int nproc, ntext;
int dmmin, dmmax;
--- 175,183 -----
struct text *atext;
double ccpu;
int ecmx;
+ struct file *filep;
+ struct inode *inodep;
+ int nfile, ninode;
struct pte *Usrptmap, *usrpt;
int nproc, ntext;
int dmmin, dmmax;
***************
*** 218,223
case 'e':
eflg++;
break;
case 'g':
gflg++;
break;
--- 248,256 -----
case 'e':
eflg++;
break;
+ case 'f':
+ fflg++;
+ break;
case 'g':
gflg++;
break;
***************
*** 277,282
printhdr();
procp = getw(nl[X_PROC].n_value);
nproc = getw(nl[X_NPROC].n_value);
savcom = (struct savcom *)calloc((unsigned) nproc, sizeof (*savcom));
for (i=0; i<nproc; i += NPROC) {
klseek(kmem, (long)procp, 0);
--- 310,321 -----
printhdr();
procp = getw(nl[X_PROC].n_value);
nproc = getw(nl[X_NPROC].n_value);
+ if (fflg) {
+ nfile=getw(nl[X_NFILE].n_value);
+ ninode=getw(nl[X_NINODE].n_value);
+ filep=(struct file *)getw(nl[X_FILE].n_value);
+ inodep=(struct inode *)getw(nl[X_INODE].n_value);
+ }
savcom = (struct savcom *)calloc((unsigned) nproc, sizeof (*savcom));
for (i=0; i<nproc; i += NPROC) {
klseek(kmem, (long)procp, 0);
***************
*** 337,342
else
printf(" %.*s", twidth - cmdstart - 2, sp->ap->a_cmdp);
printf("\n");
}
exit(npr == 0);
}
--- 376,403 -----
else
printf(" %.*s", twidth - cmdstart - 2, sp->ap->a_cmdp);
printf("\n");
+ if (fflg) {
+ register int i;
+ char tmp[20], rwf[20];
+ for (i = 0; i < NOFILE; i++) {
+ register struct fsav *p = &sp->fp[i];
+ if (p->f_type == 0)
+ continue;
+
+ printf("\t%2d: ", i);
+ rwf[0] = '\0';
+ if (p->f_rwflag & FREAD) strcat(rwf, "R");
+ if (p->f_rwflag & FWRITE) strcat(rwf, "W");
+ if (p->f_rwflag & FMARK) strcat(rwf, "M");
+ if (p->f_rwflag & FDEFER) strcat(rwf, "D");
+ if (p->f_rwflag & FSHLOCK) strcat(rwf, "S");
+ if (p->f_rwflag & FEXLOCK) strcat(rwf, "E");
+
+ if (p->f_type == DTYPE_SOCKET) {
+ printf("%6s %5s %6s%2s %8s %11d P%-3s\n",
+ "", "", "", "", "",
+ p->f_offset, rwf);
+ continue;
}
sprintf(tmp, "%2d,%d ", major(p->f_dev),
minor(p->f_dev));
***************
*** 338,343
printf(" %.*s", twidth - cmdstart - 2, sp->ap->a_cmdp);
printf("\n");
}
exit(npr == 0);
}
--- 399,436 -----
p->f_offset, rwf);
continue;
}
+ sprintf(tmp, "%2d,%d ", major(p->f_dev),
+ minor(p->f_dev));
+ printf("%-6s ", tmp);
+ printf("%5d ", p->f_ino);
+ tmp[0] = '\0';
+ if (p->f_flag & ILOCKED) strcat(tmp, "L");
+ if (p->f_flag & IUPD) strcat(tmp, "U");
+ if (p->f_flag & IACC) strcat(tmp, "A");
+ if (p->f_flag & IMOUNT) strcat(tmp, "N");
+ if (p->f_flag & IWANT) strcat(tmp, "W");
+ if (p->f_flag & ITEXT) strcat(tmp, "T");
+ if (p->f_flag & ICHG) strcat(tmp, "C");
+ if (p->f_flag & ISHLOCK) strcat(tmp, "S");
+ if (p->f_flag & IEXLOCK) strcat(tmp, "E");
+ if (p->f_flag & ILWAIT) strcat(tmp, "C");
+ if (p->f_flag & IMOD) strcat(tmp, "M");
+ if (p->f_flag & IRENAME) strcat(tmp, "R");
+ if (p->f_flag & IXMOD) strcat(tmp, "X");
+ printf("%-6s", tmp);
+ printf("%2d ", sp->fp[i].f_count);
+ if ((p->f_mode&IFMT)==IFBLK
+ || (p->f_mode&IFMT)==IFCHR)
+ sprintf(tmp, "%4d,%d",major(p->f_size),
+ minor(p->f_size));
+ else
+ sprintf(tmp, "%8d", p->f_size);
+ printf("%-8s ", tmp);
+ printf("%11d ", sp->fp[i].f_offset);
+ printf("%-4s\n", rwf);
+ }
+ }
+ }
exit(npr == 0);
}
***************
*** 539,544
hdr += strlen("SSIZ ");
cmdstart = strlen(hdr);
printf("%s COMMAND\n", hdr);
(void) fflush(stdout);
}
--- 632,639 -----
hdr += strlen("SSIZ ");
cmdstart = strlen(hdr);
printf("%s COMMAND\n", hdr);
+ if (fflg)
+ printf("%s\n", fhdr);
(void) fflush(stdout);
}
***************
*** 806,811
sp->s_un.s_ssiz = (&user.upages[UPAGES][0] - cp);
}
}
npr++;
}
--- 898,952 -----
sp->s_un.s_ssiz = (&user.upages[UPAGES][0] - cp);
}
}
+ if (fflg) {
+ struct file file;
+ struct inode inode;
+ int i;
+ sp->fp = (struct fsav *)calloc(NOFILE, sizeof (struct fsav));
+ for (i = 0; i < NOFILE; i++) {
+ if (u.u_ofile[i] == NULL)
+ continue;
+ if (u.u_ofile[i] < filep
+ || u.u_ofile[i] >= &filep[nfile]) {
+ printf("ps: file %d of %d out of bounds\n",
+ i, mproc->p_pid);
+ continue;
+ }
+ lseek(kmem, u.u_ofile[i], 0);
+ if (read(kmem, &file, sizeof(file)) != sizeof(file)) {
+ printf("ps: can't read file %d of %d\n",
+ i, mproc->p_pid);
+ continue;
+ }
+ sp->fp[i].f_type = file.f_type;
+ sp->fp[i].f_offset = file.f_offset;
+ sp->fp[i].f_rwflag = file.f_flag;
+ if (file.f_type == DTYPE_INODE) {
+ if ((struct inode *)file.f_data < inodep
+ || (struct inode *)file.f_data >= &inodep[ninode]) {
+ printf("ps: file %d of %d inode out of bounds\n",
+ i, mproc->p_pid);
+ continue;
+ }
+ lseek(kmem, file.f_data, 0);
+ if (read(kmem, &inode, sizeof(inode)) != sizeof(inode)) {
+ printf("ps: can't read inode of file %d of %d\n",
+ i, mproc->p_pid);
+ continue;
+ }
+ sp->fp[i].f_dev = inode.i_dev;
+ sp->fp[i].f_count = inode.i_count;
+ sp->fp[i].f_flag = inode.i_flag;
+ sp->fp[i].f_ino = inode.i_number;
+ if ((inode.i_mode&IFMT)==IFBLK
+ || (inode.i_mode&IFMT)==IFCHR)
+ sp->fp[i].f_size = inode.i_rdev;
+ else
+ sp->fp[i].f_size = inode.i_size;
+ sp->fp[i].f_mode = inode.i_mode;
+ }
+ }
+ }
npr++;
}
***************
*** 1011,1016
printf("%3ld:%02ld", ap->a_cpu / 60, ap->a_cpu % 60);
}
char *uhdr =
"USER PID %CPU %MEM SZ RSS TT STAT TIME";
--- 1152,1160 -----
printf("%3ld:%02ld", ap->a_cpu / 60, ap->a_cpu % 60);
}
+
+ char *fhdr =
+ "\tFD DEV INUM IFLAG CT SIZE/DEV POS FFLAG";
char *uhdr =
"USER PID %CPU %MEM SZ RSS TT STAT TIME";