/* Default child (native) target interface, for GDB when running under
Unix.
- Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
- 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009
- Free Software Foundation, Inc.
+ Copyright (C) 1988-2014 Free Software Foundation, Inc.
This file is part of GDB.
#include "symtab.h"
#include "target.h"
#include "inferior.h"
-#include "gdb_string.h"
+#include <string.h>
+#include <sys/stat.h>
#include "inf-child.h"
+#include "gdb/fileio.h"
+#include "agent.h"
+#include "gdb_wait.h"
+#include "filestuff.h"
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+/* Helper function for child_wait and the derivatives of child_wait.
+ HOSTSTATUS is the waitstatus from wait() or the equivalent; store our
+ translation of that in OURSTATUS. */
+void
+store_waitstatus (struct target_waitstatus *ourstatus, int hoststatus)
+{
+ if (WIFEXITED (hoststatus))
+ {
+ ourstatus->kind = TARGET_WAITKIND_EXITED;
+ ourstatus->value.integer = WEXITSTATUS (hoststatus);
+ }
+ else if (!WIFSTOPPED (hoststatus))
+ {
+ ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+ ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (hoststatus));
+ }
+ else
+ {
+ ourstatus->kind = TARGET_WAITKIND_STOPPED;
+ ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (hoststatus));
+ }
+}
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
for all registers. */
inferior" operation by a debugger. */
}
-static void
-inf_child_acknowledge_created_inferior (int pid)
+static int
+inf_child_follow_fork (struct target_ops *ops, int follow_child,
+ int detach_fork)
{
- /* This version of Unix doesn't require a meaningful "acknowledge
- created inferior" operation by a debugger. */
+ /* This version of Unix doesn't support following fork or vfork
+ events. */
+ return 0;
}
-static void
-inf_child_insert_fork_catchpoint (int pid)
+static int
+inf_child_can_run (void)
{
- /* This version of Unix doesn't support notification of fork
- events. */
+ return 1;
}
+static char *
+inf_child_pid_to_exec_file (int pid)
+{
+ /* This version of Unix doesn't support translation of a process ID
+ to the filename of the executable file. */
+ return NULL;
+}
+
+
+/* Target file operations. */
+
static int
-inf_child_remove_fork_catchpoint (int pid)
+inf_child_fileio_open_flags_to_host (int fileio_open_flags, int *open_flags_p)
{
- /* This version of Unix doesn't support notification of fork
- events. */
+ int open_flags = 0;
+
+ if (fileio_open_flags & ~FILEIO_O_SUPPORTED)
+ return -1;
+
+ if (fileio_open_flags & FILEIO_O_CREAT)
+ open_flags |= O_CREAT;
+ if (fileio_open_flags & FILEIO_O_EXCL)
+ open_flags |= O_EXCL;
+ if (fileio_open_flags & FILEIO_O_TRUNC)
+ open_flags |= O_TRUNC;
+ if (fileio_open_flags & FILEIO_O_APPEND)
+ open_flags |= O_APPEND;
+ if (fileio_open_flags & FILEIO_O_RDONLY)
+ open_flags |= O_RDONLY;
+ if (fileio_open_flags & FILEIO_O_WRONLY)
+ open_flags |= O_WRONLY;
+ if (fileio_open_flags & FILEIO_O_RDWR)
+ open_flags |= O_RDWR;
+/* On systems supporting binary and text mode, always open files in
+ binary mode. */
+#ifdef O_BINARY
+ open_flags |= O_BINARY;
+#endif
+
+ *open_flags_p = open_flags;
return 0;
}
-static void
-inf_child_insert_vfork_catchpoint (int pid)
+static int
+inf_child_errno_to_fileio_error (int errnum)
{
- /* This version of Unix doesn't support notification of vfork
- events. */
+ switch (errnum)
+ {
+ case EPERM:
+ return FILEIO_EPERM;
+ case ENOENT:
+ return FILEIO_ENOENT;
+ case EINTR:
+ return FILEIO_EINTR;
+ case EIO:
+ return FILEIO_EIO;
+ case EBADF:
+ return FILEIO_EBADF;
+ case EACCES:
+ return FILEIO_EACCES;
+ case EFAULT:
+ return FILEIO_EFAULT;
+ case EBUSY:
+ return FILEIO_EBUSY;
+ case EEXIST:
+ return FILEIO_EEXIST;
+ case ENODEV:
+ return FILEIO_ENODEV;
+ case ENOTDIR:
+ return FILEIO_ENOTDIR;
+ case EISDIR:
+ return FILEIO_EISDIR;
+ case EINVAL:
+ return FILEIO_EINVAL;
+ case ENFILE:
+ return FILEIO_ENFILE;
+ case EMFILE:
+ return FILEIO_EMFILE;
+ case EFBIG:
+ return FILEIO_EFBIG;
+ case ENOSPC:
+ return FILEIO_ENOSPC;
+ case ESPIPE:
+ return FILEIO_ESPIPE;
+ case EROFS:
+ return FILEIO_EROFS;
+ case ENOSYS:
+ return FILEIO_ENOSYS;
+ case ENAMETOOLONG:
+ return FILEIO_ENAMETOOLONG;
+ }
+ return FILEIO_EUNKNOWN;
}
+/* Open FILENAME on the target, using FLAGS and MODE. Return a
+ target file descriptor, or -1 if an error occurs (and set
+ *TARGET_ERRNO). */
static int
-inf_child_remove_vfork_catchpoint (int pid)
+inf_child_fileio_open (const char *filename, int flags, int mode,
+ int *target_errno)
{
- /* This version of Unix doesn't support notification of vfork
- events. */
- return 0;
+ int nat_flags;
+ int fd;
+
+ if (inf_child_fileio_open_flags_to_host (flags, &nat_flags) == -1)
+ {
+ *target_errno = FILEIO_EINVAL;
+ return -1;
+ }
+
+ /* We do not need to convert MODE, since the fileio protocol uses
+ the standard values. */
+ fd = gdb_open_cloexec (filename, nat_flags, mode);
+ if (fd == -1)
+ *target_errno = inf_child_errno_to_fileio_error (errno);
+
+ return fd;
}
+/* Write up to LEN bytes from WRITE_BUF to FD on the target.
+ Return the number of bytes written, or -1 if an error occurs
+ (and set *TARGET_ERRNO). */
static int
-inf_child_follow_fork (struct target_ops *ops, int follow_child)
+inf_child_fileio_pwrite (int fd, const gdb_byte *write_buf, int len,
+ ULONGEST offset, int *target_errno)
{
- /* This version of Unix doesn't support following fork or vfork
- events. */
- return 0;
+ int ret;
+
+#ifdef HAVE_PWRITE
+ ret = pwrite (fd, write_buf, len, (long) offset);
+#else
+ ret = -1;
+#endif
+ /* If we have no pwrite or it failed for this file, use lseek/write. */
+ if (ret == -1)
+ {
+ ret = lseek (fd, (long) offset, SEEK_SET);
+ if (ret != -1)
+ ret = write (fd, write_buf, len);
+ }
+
+ if (ret == -1)
+ *target_errno = inf_child_errno_to_fileio_error (errno);
+
+ return ret;
}
-static void
-inf_child_insert_exec_catchpoint (int pid)
+/* Read up to LEN bytes FD on the target into READ_BUF.
+ Return the number of bytes read, or -1 if an error occurs
+ (and set *TARGET_ERRNO). */
+static int
+inf_child_fileio_pread (int fd, gdb_byte *read_buf, int len,
+ ULONGEST offset, int *target_errno)
{
- /* This version of Unix doesn't support notification of exec
- events. */
+ int ret;
+
+#ifdef HAVE_PREAD
+ ret = pread (fd, read_buf, len, (long) offset);
+#else
+ ret = -1;
+#endif
+ /* If we have no pread or it failed for this file, use lseek/read. */
+ if (ret == -1)
+ {
+ ret = lseek (fd, (long) offset, SEEK_SET);
+ if (ret != -1)
+ ret = read (fd, read_buf, len);
+ }
+
+ if (ret == -1)
+ *target_errno = inf_child_errno_to_fileio_error (errno);
+
+ return ret;
}
+/* Close FD on the target. Return 0, or -1 if an error occurs
+ (and set *TARGET_ERRNO). */
static int
-inf_child_remove_exec_catchpoint (int pid)
+inf_child_fileio_close (int fd, int *target_errno)
{
- /* This version of Unix doesn't support notification of exec
- events. */
- return 0;
+ int ret;
+
+ ret = close (fd);
+ if (ret == -1)
+ *target_errno = inf_child_errno_to_fileio_error (errno);
+
+ return ret;
}
+/* Unlink FILENAME on the target. Return 0, or -1 if an error
+ occurs (and set *TARGET_ERRNO). */
static int
-inf_child_can_run (void)
+inf_child_fileio_unlink (const char *filename, int *target_errno)
{
- return 1;
+ int ret;
+
+ ret = unlink (filename);
+ if (ret == -1)
+ *target_errno = inf_child_errno_to_fileio_error (errno);
+
+ return ret;
}
+/* Read value of symbolic link FILENAME on the target. Return a
+ null-terminated string allocated via xmalloc, or NULL if an error
+ occurs (and set *TARGET_ERRNO). */
static char *
-inf_child_pid_to_exec_file (int pid)
+inf_child_fileio_readlink (const char *filename, int *target_errno)
{
- /* This version of Unix doesn't support translation of a process ID
- to the filename of the executable file. */
+ /* We support readlink only on systems that also provide a compile-time
+ maximum path length (PATH_MAX), at least for now. */
+#if defined (HAVE_READLINK) && defined (PATH_MAX)
+ char buf[PATH_MAX];
+ int len;
+ char *ret;
+
+ len = readlink (filename, buf, sizeof buf);
+ if (len < 0)
+ {
+ *target_errno = inf_child_errno_to_fileio_error (errno);
+ return NULL;
+ }
+
+ ret = xmalloc (len + 1);
+ memcpy (ret, buf, len);
+ ret[len] = '\0';
+ return ret;
+#else
+ *target_errno = FILEIO_ENOSYS;
return NULL;
+#endif
+}
+
+static int
+inf_child_use_agent (int use)
+{
+ if (agent_loaded_p ())
+ {
+ use_agent = use;
+ return 1;
+ }
+ else
+ return 0;
+}
+
+static int
+inf_child_can_use_agent (void)
+{
+ return agent_loaded_p ();
}
struct target_ops *
inf_child_target (void)
{
- struct target_ops *t = XZALLOC (struct target_ops);
+ struct target_ops *t = XCNEW (struct target_ops);
+
t->to_shortname = "child";
t->to_longname = "Unix child process";
t->to_doc = "Unix child process (started by the \"run\" command).";
t->to_terminal_ours = terminal_ours;
t->to_terminal_info = child_terminal_info;
t->to_post_startup_inferior = inf_child_post_startup_inferior;
- t->to_acknowledge_created_inferior = inf_child_acknowledge_created_inferior;
- t->to_insert_fork_catchpoint = inf_child_insert_fork_catchpoint;
- t->to_remove_fork_catchpoint = inf_child_remove_fork_catchpoint;
- t->to_insert_vfork_catchpoint = inf_child_insert_vfork_catchpoint;
- t->to_remove_vfork_catchpoint = inf_child_remove_vfork_catchpoint;
t->to_follow_fork = inf_child_follow_fork;
- t->to_insert_exec_catchpoint = inf_child_insert_exec_catchpoint;
- t->to_remove_exec_catchpoint = inf_child_remove_exec_catchpoint;
t->to_can_run = inf_child_can_run;
t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
t->to_stratum = process_stratum;
- t->to_has_all_memory = 1;
- t->to_has_memory = 1;
- t->to_has_stack = 1;
- t->to_has_registers = 1;
- t->to_has_execution = 1;
+ t->to_has_all_memory = default_child_has_all_memory;
+ t->to_has_memory = default_child_has_memory;
+ t->to_has_stack = default_child_has_stack;
+ t->to_has_registers = default_child_has_registers;
+ t->to_has_execution = default_child_has_execution;
+ t->to_fileio_open = inf_child_fileio_open;
+ t->to_fileio_pwrite = inf_child_fileio_pwrite;
+ t->to_fileio_pread = inf_child_fileio_pread;
+ t->to_fileio_close = inf_child_fileio_close;
+ t->to_fileio_unlink = inf_child_fileio_unlink;
+ t->to_fileio_readlink = inf_child_fileio_readlink;
t->to_magic = OPS_MAGIC;
+ t->to_use_agent = inf_child_use_agent;
+ t->to_can_use_agent = inf_child_can_use_agent;
return t;
}