/* 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_fileio_readlink (const char *filename, int *target_errno)
{
/* We support readlink only on systems that also provide a compile-time
maximum path length (MAXPATHLEN), at least for now. */
#if defined (HAVE_READLINK) && defined (MAXPATHLEN)
char buf[MAXPATHLEN - 1];
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
}
/* 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 (struct target_ops *self,
int fd, gdb_byte *read_buf, int len,
ULONGEST offset, int *target_errno)
{
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;
}
/* 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_fileio_pwrite (struct target_ops *self,
int fd, const gdb_byte *write_buf, int len,
ULONGEST offset, int *target_errno)
{
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;
}
/* Unlink FILENAME on the target. Return 0, or -1 if an error
occurs (and set *TARGET_ERRNO). */
static int
inf_child_fileio_unlink (const char *filename, int *target_errno)
{
int ret;
ret = unlink (filename);
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_fileio_close (int fd, int *target_errno)
{
int ret;
ret = close (fd);
if (ret == -1)
*target_errno = inf_child_errno_to_fileio_error (errno);
return ret;
}
/* 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_fileio_open (const char *filename, int flags, int mode,
int *target_errno)
{
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;
}
