minix/commands/mdb/gnu_load.c
Ben Gras 5e3b213f05 import of mdb (minix debugger), some ptrace and signals unbreaking
seem to have made it work (runtime debugging and core reading).
2005-08-04 08:44:16 +00:00

76 lines
2 KiB
C

/*
* gnu_load for mdb.c
*/
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <gnu/a.out.h>
_PROTOTYPE( unsigned int gnu_load, (char *filename, struct nlist **start) );
_PROTOTYPE( void do_error, (char *message) );
unsigned int gnu_load( filename, start)
char *filename;
struct nlist **start;
{
struct exec header;
unsigned int nsym, string_size;
char *names;
struct nlist *p;
int fd;
if ( (fd = open( filename, 0)) < 0 ||
read( fd, (char *) &header, sizeof header ) != sizeof header )
{
do_error( "gnu_load" );
if ( fd >= 0) close( fd );
return 0;
}
if ( lseek( fd, N_STROFF( header ), 0 ) != N_STROFF( header ) )
{
do_error( "gnu_load - reading header" );
close( fd );
return 0;
}
if ( read( fd, (char *) &string_size, sizeof string_size ) < 0 )
{
do_error( "gnu_load - reading header" );
close( fd );
return 0;
}
if ( (int) header.a_syms < 0 ||
(unsigned) header.a_syms != header.a_syms ||
(*start = (struct nlist *) malloc( (unsigned) header.a_syms +
string_size ))
== (struct nlist *) NULL &&
header.a_syms != 0 )
{
close( fd );
return 0;
}
lseek( fd, N_SYMOFF( header ), 0 );
if ( read( fd, (char *) *start, (int) header.a_syms + string_size ) < 0 )
{
do_error( "gnu_load - reading symbols" );
close( fd );
return 0;
}
close( fd );
nsym = (unsigned int) header.a_syms / sizeof (struct nlist);
names = (char *) *start + header.a_syms;
for ( p = *start; p < *start + nsym; p++)
if(p->n_un.n_strx)
p->n_un.n_name = names + p->n_un.n_strx;
return nsym;
}