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* acconfig.h (HAVE_PREAD64): Add.

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* configure.in: Check for pread64.
	* config.in: Regenerated.
	* configure: Regenerated.
	* lin-lwp.c (lin_lwp_xfer_memory): Call linux_proc_xfer_memory.
	* linux-proc.c (linux_proc_xfer_memory): New function.
	* config/nm-linux.h (linux_proc_xfer_memory): Add prototype.
This commit is contained in:
Daniel Jacobowitz 2002-11-26 01:23:46 +00:00
parent afbfa4076a
commit eb78484829
8 changed files with 193 additions and 67 deletions
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49
gdb/linux-proc.c
View file

@ -25,6 +25,8 @@
#include <sys/procfs.h> /* for elf_gregset etc. */
#include <sys/stat.h> /* for struct stat */
#include <ctype.h> /* for isdigit */
#include <unistd.h> /* for open, pread64 */
#include <fcntl.h> /* for O_RDONLY */
#include "regcache.h" /* for registers_changed */
#include "gregset.h" /* for gregset */
#include "gdbcore.h" /* for get_exec_file */
@ -33,6 +35,10 @@
#include "cli/cli-decode.h" /* for add_info */
#include "gdb_string.h"
#ifndef O_LARGEFILE
#define O_LARGEFILE 0
#endif
/* Function: child_pid_to_exec_file
*
* Accepts an integer pid
@ -577,3 +583,46 @@ Specify any of the following keywords for detailed info:\n\
status -- list a different bunch of random process info.\n\
all -- list all available /proc info.");
}
int linux_proc_xfer_memory (CORE_ADDR addr, char *myaddr, int len, int write,
struct mem_attrib *attrib,
struct target_ops *target)
{
int fd, ret;
char filename[64];
if (write)
return 0;
/* Don't bother for one word. */
if (len < 3 * sizeof (long))
return 0;
/* We could keep this file open and cache it - possibly one
per thread. That requires some juggling, but is even faster. */
sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid));
fd = open (filename, O_RDONLY | O_LARGEFILE);
if (fd == -1)
return 0;
/* If pread64 is available, use it. It's faster if the kernel
supports it (only one syscall), and it's 64-bit safe even
on 32-bit platforms (for instance, SPARC debugging a SPARC64
application).
We play some autoconf and CFLAGS games to get this declaration
exposed: -D_XOPEN_SOURCE=500 -D_LARGEFILE64_SOURCE. And then
a -D_BSD_SOURCE to counteract the defaults for _XOPEN_SOURCE. */
#ifdef HAVE_PREAD64
if (pread64 (fd, myaddr, len, addr) != len)
#else
if (lseek (fd, addr, SEEK_SET) == -1
|| read (fd, myaddr, len) != len)
#endif
ret = 0;
else
ret = len;
close (fd);
return ret;
}