new command 'dumpcore' that can write core files of running processes.
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3 changed files with 201 additions and 0 deletions
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@ -77,6 +77,7 @@ ALL = \
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diff \
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dirname \
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du \
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dumpcore \
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ed \
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eject \
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env \
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@ -364,6 +365,10 @@ du: du.c
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$(CCLD) -o $@ $?
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@install -S 256kw $@
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dumpcore: dumpcore.c
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$(CCLD) -D_SYSTEM=1 -o $@ $? -lsysutil -lsys
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@install -S 32k $@
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ed: ed.c
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$(CCLD) -o $@ $?
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@install -S 32kw $@
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@ -955,6 +960,7 @@ install: \
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/usr/bin/diff \
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/usr/bin/dirname \
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/usr/bin/du \
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/usr/bin/dumpcore \
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/usr/bin/ed \
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/usr/bin/eject \
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/usr/bin/env \
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@ -1251,6 +1257,9 @@ install: \
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/usr/bin/du: du
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install -cs -o bin $? $@
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/usr/bin/dumpcore: dumpcore
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install -cs -o bin $? $@
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/usr/bin/ed: ed
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install -cs -o bin $? $@
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166
commands/simple/dumpcore.c
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166
commands/simple/dumpcore.c
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@ -0,0 +1,166 @@
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#include <fcntl.h>
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#include <assert.h>
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#include <unistd.h>
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#include <minix/config.h>
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#include <minix/type.h>
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#include <minix/callnr.h>
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#include <minix/safecopies.h>
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#include <minix/endpoint.h>
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#include <minix/com.h>
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#include <minix/syslib.h>
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#include <minix/const.h>
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#include <sys/ptrace.h>
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#include <sys/svrctl.h>
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#include <dirent.h>
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#include <timers.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "../../kernel/const.h"
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#include "../../kernel/type.h"
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#include "../../kernel/config.h"
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#include "../../kernel/debug.h"
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#include "../../kernel/proc.h"
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#include "../../kernel/ipc.h"
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#define SLOTS (NR_TASKS + NR_PROCS)
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struct proc proc[SLOTS];
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int write_seg(int fd, off_t off, endpoint_t proc_e, int seg,
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off_t seg_off, phys_bytes seg_bytes)
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{
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int r, block_size, fl;
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off_t n, o, b_off;
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block_t b;
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struct buf *bp;
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ssize_t w;
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static char buf[1024];
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for (o= seg_off; o < seg_off+seg_bytes; o += sizeof(buf))
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{
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/* Copy a chunk from user space to the block buffer. */
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if(sys_vircopy(proc_e, seg, (phys_bytes) o,
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SELF, D, (vir_bytes) buf, (phys_bytes) sizeof(buf)) != OK) {
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printf("write_seg: sys_vircopy failed\n");
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return 1;
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}
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if((w=write(fd, buf, sizeof(buf))) != sizeof(buf)) {
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if(w < 0) printf("write error: %s\n", strerror(errno));
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printf("write_seg: write failed: %d/%d\n", w, sizeof(buf));
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return 1;
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}
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}
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return OK;
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}
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int dumpcore(endpoint_t proc_e)
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{
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int r, seg, exists, fd;
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mode_t omode;
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vir_bytes len;
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off_t off, seg_off;
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long trace_off, trace_data;
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struct mem_map segs[NR_LOCAL_SEGS];
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struct proc procentry;
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int proc_s;
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ssize_t w;
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char core_name[200];
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if(sys_getproctab(proc) != OK) {
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printf( "Couldn't get proc tab.\n");
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return 1;
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}
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for(proc_s = 0; proc_s < SLOTS; proc_s++)
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if(proc[proc_s].p_endpoint == proc_e &&
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!(proc[proc_s].p_rts_flags & SLOT_FREE))
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break;
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if(proc_s >= SLOTS) {
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printf( "endpoint %d not found.\n", proc_e);
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return 1;
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}
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if(proc_s < 0 || proc_s >= SLOTS) {
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printf( "Slot out of range (internal error).\n");
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return 1;
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}
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if(proc[proc_s].p_rts_flags & SLOT_FREE) {
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printf( "slot %d is no process (internal error).\n",
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proc_s);
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return 1;
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}
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sprintf(core_name, "/tmp/core.%d", proc_e);
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if((fd = open(core_name,
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O_CREAT|O_WRONLY|O_EXCL|O_NONBLOCK, 0600)) < 0) {
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printf("couldn't open %s (%s)\n",
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core_name, strerror(errno));
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return 1;
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}
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proc[proc_s].p_name[P_NAME_LEN-1] = '\0';
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memcpy(segs, proc[proc_s].p_memmap, sizeof(segs));
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off= 0;
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if((w=write(fd, segs, sizeof(segs))) != sizeof(segs)) {
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if(w < 0) printf("write error: %s\n", strerror(errno));
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printf( "segs write failed: %d/%d\n", w, sizeof(segs));
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return 1;
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}
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off += sizeof(segs);
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/* Write out the whole kernel process table entry to get the regs. */
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for (trace_off= 0;; trace_off += sizeof(long))
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{
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r= sys_trace(T_GETUSER, proc_e, trace_off, &trace_data);
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if (r != OK)
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{
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break;
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}
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r= write(fd, &trace_data, sizeof(trace_data));
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if (r != sizeof(trace_data)) {
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printf( "trace_data write failed\n");
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return 1;
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}
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off += sizeof(trace_data);
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}
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/* Loop through segments and write the segments themselves out. */
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for (seg = 0; seg < NR_LOCAL_SEGS; seg++) {
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len= segs[seg].mem_len << CLICK_SHIFT;
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seg_off= segs[seg].mem_vir << CLICK_SHIFT;
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r= write_seg(fd, off, proc_e, seg, seg_off, len);
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if (r != OK)
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{
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printf( "write failed\n");
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return 1;
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}
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off += len;
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}
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close(fd);
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return 0;
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}
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main(int argc, char *argv[])
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{
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if(argc != 2) {
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printf("usage: %s <endpoint>\n", argv[0]);
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return 1;
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}
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dumpcore(atoi(argv[1]));
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return 1;
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}
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26
man/man1/dumpcore.1
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26
man/man1/dumpcore.1
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.TH DUMPCORE 1
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.SH NAME
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dumpcore \- generate core file of running process
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.SH SYNOPSIS
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service run /usr/bin/dumpcore -args \fIendpoint\fR
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.br
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.de FL
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.TP
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\\fB\\$1\\fR
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\\$2
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..
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.de EX
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.TP 20
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\\fB\\$1\\fR
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# \\$2
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..
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.SH DESCRIPTION
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\fIDumpcore\fR executes the same code that FS executes in order to
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generate a core dump of a currently running process, identified by
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endpoint number. Obtain an endpoint number by using the F1 debug
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dump, or ps with -E option.
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.SH BUGS
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\fIDumpcore\fR has duplicate code with FS, and has to be started with
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the service command.
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.SH "SEE ALSO"
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.BR ps (1).
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