minix/commands/simple/dumpcore.c

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#include <fcntl.h>
#include <assert.h>
#include <unistd.h>
#include <minix/config.h>
#include <minix/type.h>
#include <minix/callnr.h>
#include <minix/safecopies.h>
#include <minix/endpoint.h>
#include <minix/com.h>
#include <minix/syslib.h>
#include <minix/const.h>
#include <sys/ptrace.h>
#include <sys/svrctl.h>
#include <dirent.h>
#include <timers.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "../../kernel/const.h"
#include "../../kernel/type.h"
#include "../../kernel/config.h"
#include "../../kernel/debug.h"
#include "../../kernel/proc.h"
#include "../../kernel/ipc.h"
#define SLOTS (NR_TASKS + NR_PROCS)
struct proc proc[SLOTS];
int write_seg(int fd, off_t off, endpoint_t proc_e, int seg,
off_t seg_off, phys_bytes seg_bytes)
{
int r, block_size, fl;
off_t n, o, b_off;
block_t b;
struct buf *bp;
ssize_t w;
static char buf[1024];
for (o= seg_off; o < seg_off+seg_bytes; o += sizeof(buf))
{
/* Copy a chunk from user space to the block buffer. */
if(sys_vircopy(proc_e, seg, (phys_bytes) o,
SELF, D, (vir_bytes) buf, (phys_bytes) sizeof(buf)) != OK) {
printf("write_seg: sys_vircopy failed\n");
return 1;
}
if((w=write(fd, buf, sizeof(buf))) != sizeof(buf)) {
if(w < 0) printf("write error: %s\n", strerror(errno));
printf("write_seg: write failed: %d/%d\n", w, sizeof(buf));
return 1;
}
}
return OK;
}
int dumpcore(endpoint_t proc_e)
{
int r, seg, exists, fd;
mode_t omode;
vir_bytes len;
off_t off, seg_off;
long trace_off, trace_data;
struct mem_map segs[NR_LOCAL_SEGS];
struct proc procentry;
int proc_s;
ssize_t w;
char core_name[200];
if(sys_getproctab(proc) != OK) {
printf( "Couldn't get proc tab.\n");
return 1;
}
for(proc_s = 0; proc_s < SLOTS; proc_s++)
if(proc[proc_s].p_endpoint == proc_e &&
!(proc[proc_s].p_rts_flags & SLOT_FREE))
break;
if(proc_s >= SLOTS) {
printf( "endpoint %d not found.\n", proc_e);
return 1;
}
if(proc_s < 0 || proc_s >= SLOTS) {
printf( "Slot out of range (internal error).\n");
return 1;
}
if(proc[proc_s].p_rts_flags & SLOT_FREE) {
printf( "slot %d is no process (internal error).\n",
proc_s);
return 1;
}
sprintf(core_name, "/tmp/core.%d", proc_e);
if((fd = open(core_name,
O_CREAT|O_WRONLY|O_EXCL|O_NONBLOCK, 0600)) < 0) {
printf("couldn't open %s (%s)\n",
core_name, strerror(errno));
return 1;
}
proc[proc_s].p_name[P_NAME_LEN-1] = '\0';
memcpy(segs, proc[proc_s].p_memmap, sizeof(segs));
off= 0;
if((w=write(fd, segs, sizeof(segs))) != sizeof(segs)) {
if(w < 0) printf("write error: %s\n", strerror(errno));
printf( "segs write failed: %d/%d\n", w, sizeof(segs));
return 1;
}
off += sizeof(segs);
/* Write out the whole kernel process table entry to get the regs. */
for (trace_off= 0;; trace_off += sizeof(long))
{
r= sys_trace(T_GETUSER, proc_e, trace_off, &trace_data);
if (r != OK)
{
break;
}
r= write(fd, &trace_data, sizeof(trace_data));
if (r != sizeof(trace_data)) {
printf( "trace_data write failed\n");
return 1;
}
off += sizeof(trace_data);
}
/* Loop through segments and write the segments themselves out. */
for (seg = 0; seg < NR_LOCAL_SEGS; seg++) {
len= segs[seg].mem_len << CLICK_SHIFT;
seg_off= segs[seg].mem_vir << CLICK_SHIFT;
r= write_seg(fd, off, proc_e, seg, seg_off, len);
if (r != OK)
{
printf( "write failed\n");
return 1;
}
off += len;
}
close(fd);
return 0;
}
main(int argc, char *argv[])
{
if(argc != 2) {
printf("usage: %s <endpoint>\n", argv[0]);
return 1;
}
dumpcore(atoi(argv[1]));
return 1;
}