| /* Remote File-I/O communications |
| |
| Copyright (C) 2003, 2005-2012 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| /* See the GDB User Guide for details of the GDB remote protocol. */ |
| |
| #include "defs.h" |
| #include "gdb_string.h" |
| #include "gdbcmd.h" |
| #include "remote.h" |
| #include "gdb/fileio.h" |
| #include "gdb_wait.h" |
| #include "gdb_stat.h" |
| #include "exceptions.h" |
| #include "remote-fileio.h" |
| #include "event-loop.h" |
| #include "target.h" |
| #include "filenames.h" |
| |
| #include <fcntl.h> |
| #include <sys/time.h> |
| #ifdef __CYGWIN__ |
| #include <sys/cygwin.h> /* For cygwin_conv_path. */ |
| #endif |
| #include <signal.h> |
| |
| static struct { |
| int *fd_map; |
| int fd_map_size; |
| } remote_fio_data; |
| |
| #define FIO_FD_INVALID -1 |
| #define FIO_FD_CONSOLE_IN -2 |
| #define FIO_FD_CONSOLE_OUT -3 |
| |
| static int remote_fio_system_call_allowed = 0; |
| |
| static struct async_signal_handler *sigint_fileio_token; |
| |
| static int |
| remote_fileio_init_fd_map (void) |
| { |
| int i; |
| |
| if (!remote_fio_data.fd_map) |
| { |
| remote_fio_data.fd_map = (int *) xmalloc (10 * sizeof (int)); |
| remote_fio_data.fd_map_size = 10; |
| remote_fio_data.fd_map[0] = FIO_FD_CONSOLE_IN; |
| remote_fio_data.fd_map[1] = FIO_FD_CONSOLE_OUT; |
| remote_fio_data.fd_map[2] = FIO_FD_CONSOLE_OUT; |
| for (i = 3; i < 10; ++i) |
| remote_fio_data.fd_map[i] = FIO_FD_INVALID; |
| } |
| return 3; |
| } |
| |
| static int |
| remote_fileio_resize_fd_map (void) |
| { |
| int i = remote_fio_data.fd_map_size; |
| |
| if (!remote_fio_data.fd_map) |
| return remote_fileio_init_fd_map (); |
| remote_fio_data.fd_map_size += 10; |
| remote_fio_data.fd_map = |
| (int *) xrealloc (remote_fio_data.fd_map, |
| remote_fio_data.fd_map_size * sizeof (int)); |
| for (; i < remote_fio_data.fd_map_size; i++) |
| remote_fio_data.fd_map[i] = FIO_FD_INVALID; |
| return remote_fio_data.fd_map_size - 10; |
| } |
| |
| static int |
| remote_fileio_next_free_fd (void) |
| { |
| int i; |
| |
| for (i = 0; i < remote_fio_data.fd_map_size; ++i) |
| if (remote_fio_data.fd_map[i] == FIO_FD_INVALID) |
| return i; |
| return remote_fileio_resize_fd_map (); |
| } |
| |
| static int |
| remote_fileio_fd_to_targetfd (int fd) |
| { |
| int target_fd = remote_fileio_next_free_fd (); |
| |
| remote_fio_data.fd_map[target_fd] = fd; |
| return target_fd; |
| } |
| |
| static int |
| remote_fileio_map_fd (int target_fd) |
| { |
| remote_fileio_init_fd_map (); |
| if (target_fd < 0 || target_fd >= remote_fio_data.fd_map_size) |
| return FIO_FD_INVALID; |
| return remote_fio_data.fd_map[target_fd]; |
| } |
| |
| static void |
| remote_fileio_close_target_fd (int target_fd) |
| { |
| remote_fileio_init_fd_map (); |
| if (target_fd >= 0 && target_fd < remote_fio_data.fd_map_size) |
| remote_fio_data.fd_map[target_fd] = FIO_FD_INVALID; |
| } |
| |
| static int |
| remote_fileio_oflags_to_host (long flags) |
| { |
| int hflags = 0; |
| |
| if (flags & FILEIO_O_CREAT) |
| hflags |= O_CREAT; |
| if (flags & FILEIO_O_EXCL) |
| hflags |= O_EXCL; |
| if (flags & FILEIO_O_TRUNC) |
| hflags |= O_TRUNC; |
| if (flags & FILEIO_O_APPEND) |
| hflags |= O_APPEND; |
| if (flags & FILEIO_O_RDONLY) |
| hflags |= O_RDONLY; |
| if (flags & FILEIO_O_WRONLY) |
| hflags |= O_WRONLY; |
| if (flags & FILEIO_O_RDWR) |
| hflags |= O_RDWR; |
| /* On systems supporting binary and text mode, always open files in |
| binary mode. */ |
| #ifdef O_BINARY |
| hflags |= O_BINARY; |
| #endif |
| return hflags; |
| } |
| |
| static mode_t |
| remote_fileio_mode_to_host (long mode, int open_call) |
| { |
| mode_t hmode = 0; |
| |
| if (!open_call) |
| { |
| if (mode & FILEIO_S_IFREG) |
| hmode |= S_IFREG; |
| if (mode & FILEIO_S_IFDIR) |
| hmode |= S_IFDIR; |
| if (mode & FILEIO_S_IFCHR) |
| hmode |= S_IFCHR; |
| } |
| if (mode & FILEIO_S_IRUSR) |
| hmode |= S_IRUSR; |
| if (mode & FILEIO_S_IWUSR) |
| hmode |= S_IWUSR; |
| if (mode & FILEIO_S_IXUSR) |
| hmode |= S_IXUSR; |
| #ifdef S_IRGRP |
| if (mode & FILEIO_S_IRGRP) |
| hmode |= S_IRGRP; |
| #endif |
| #ifdef S_IWGRP |
| if (mode & FILEIO_S_IWGRP) |
| hmode |= S_IWGRP; |
| #endif |
| #ifdef S_IXGRP |
| if (mode & FILEIO_S_IXGRP) |
| hmode |= S_IXGRP; |
| #endif |
| if (mode & FILEIO_S_IROTH) |
| hmode |= S_IROTH; |
| #ifdef S_IWOTH |
| if (mode & FILEIO_S_IWOTH) |
| hmode |= S_IWOTH; |
| #endif |
| #ifdef S_IXOTH |
| if (mode & FILEIO_S_IXOTH) |
| hmode |= S_IXOTH; |
| #endif |
| return hmode; |
| } |
| |
| static LONGEST |
| remote_fileio_mode_to_target (mode_t mode) |
| { |
| mode_t tmode = 0; |
| |
| if (S_ISREG(mode)) |
| tmode |= FILEIO_S_IFREG; |
| if (S_ISDIR(mode)) |
| tmode |= FILEIO_S_IFDIR; |
| if (S_ISCHR(mode)) |
| tmode |= FILEIO_S_IFCHR; |
| if (mode & S_IRUSR) |
| tmode |= FILEIO_S_IRUSR; |
| if (mode & S_IWUSR) |
| tmode |= FILEIO_S_IWUSR; |
| if (mode & S_IXUSR) |
| tmode |= FILEIO_S_IXUSR; |
| #ifdef S_IRGRP |
| if (mode & S_IRGRP) |
| tmode |= FILEIO_S_IRGRP; |
| #endif |
| #ifdef S_IWRGRP |
| if (mode & S_IWGRP) |
| tmode |= FILEIO_S_IWGRP; |
| #endif |
| #ifdef S_IXGRP |
| if (mode & S_IXGRP) |
| tmode |= FILEIO_S_IXGRP; |
| #endif |
| if (mode & S_IROTH) |
| tmode |= FILEIO_S_IROTH; |
| #ifdef S_IWOTH |
| if (mode & S_IWOTH) |
| tmode |= FILEIO_S_IWOTH; |
| #endif |
| #ifdef S_IXOTH |
| if (mode & S_IXOTH) |
| tmode |= FILEIO_S_IXOTH; |
| #endif |
| return tmode; |
| } |
| |
| static int |
| remote_fileio_errno_to_target (int error) |
| { |
| switch (error) |
| { |
| 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; |
| } |
| |
| static int |
| remote_fileio_seek_flag_to_host (long num, int *flag) |
| { |
| if (!flag) |
| return 0; |
| switch (num) |
| { |
| case FILEIO_SEEK_SET: |
| *flag = SEEK_SET; |
| break; |
| case FILEIO_SEEK_CUR: |
| *flag = SEEK_CUR; |
| break; |
| case FILEIO_SEEK_END: |
| *flag = SEEK_END; |
| break; |
| default: |
| return -1; |
| } |
| return 0; |
| } |
| |
| static int |
| remote_fileio_extract_long (char **buf, LONGEST *retlong) |
| { |
| char *c; |
| int sign = 1; |
| |
| if (!buf || !*buf || !**buf || !retlong) |
| return -1; |
| c = strchr (*buf, ','); |
| if (c) |
| *c++ = '\0'; |
| else |
| c = strchr (*buf, '\0'); |
| while (strchr ("+-", **buf)) |
| { |
| if (**buf == '-') |
| sign = -sign; |
| ++*buf; |
| } |
| for (*retlong = 0; **buf; ++*buf) |
| { |
| *retlong <<= 4; |
| if (**buf >= '0' && **buf <= '9') |
| *retlong += **buf - '0'; |
| else if (**buf >= 'a' && **buf <= 'f') |
| *retlong += **buf - 'a' + 10; |
| else if (**buf >= 'A' && **buf <= 'F') |
| *retlong += **buf - 'A' + 10; |
| else |
| return -1; |
| } |
| *retlong *= sign; |
| *buf = c; |
| return 0; |
| } |
| |
| static int |
| remote_fileio_extract_int (char **buf, long *retint) |
| { |
| int ret; |
| LONGEST retlong; |
| |
| if (!retint) |
| return -1; |
| ret = remote_fileio_extract_long (buf, &retlong); |
| if (!ret) |
| *retint = (long) retlong; |
| return ret; |
| } |
| |
| static int |
| remote_fileio_extract_ptr_w_len (char **buf, CORE_ADDR *ptrval, int *length) |
| { |
| char *c; |
| LONGEST retlong; |
| |
| if (!buf || !*buf || !**buf || !ptrval || !length) |
| return -1; |
| c = strchr (*buf, '/'); |
| if (!c) |
| return -1; |
| *c++ = '\0'; |
| if (remote_fileio_extract_long (buf, &retlong)) |
| return -1; |
| *ptrval = (CORE_ADDR) retlong; |
| *buf = c; |
| if (remote_fileio_extract_long (buf, &retlong)) |
| return -1; |
| *length = (int) retlong; |
| return 0; |
| } |
| |
| /* Convert to big endian. */ |
| static void |
| remote_fileio_to_be (LONGEST num, char *buf, int bytes) |
| { |
| int i; |
| |
| for (i = 0; i < bytes; ++i) |
| buf[i] = (num >> (8 * (bytes - i - 1))) & 0xff; |
| } |
| |
| static void |
| remote_fileio_to_fio_uint (long num, fio_uint_t fnum) |
| { |
| remote_fileio_to_be ((LONGEST) num, (char *) fnum, 4); |
| } |
| |
| static void |
| remote_fileio_to_fio_mode (mode_t num, fio_mode_t fnum) |
| { |
| remote_fileio_to_be (remote_fileio_mode_to_target(num), (char *) fnum, 4); |
| } |
| |
| static void |
| remote_fileio_to_fio_time (time_t num, fio_time_t fnum) |
| { |
| remote_fileio_to_be ((LONGEST) num, (char *) fnum, 4); |
| } |
| |
| static void |
| remote_fileio_to_fio_long (LONGEST num, fio_long_t fnum) |
| { |
| remote_fileio_to_be (num, (char *) fnum, 8); |
| } |
| |
| static void |
| remote_fileio_to_fio_ulong (LONGEST num, fio_ulong_t fnum) |
| { |
| remote_fileio_to_be (num, (char *) fnum, 8); |
| } |
| |
| static void |
| remote_fileio_to_fio_stat (struct stat *st, struct fio_stat *fst) |
| { |
| LONGEST blksize; |
| |
| /* `st_dev' is set in the calling function. */ |
| remote_fileio_to_fio_uint ((long) st->st_ino, fst->fst_ino); |
| remote_fileio_to_fio_mode (st->st_mode, fst->fst_mode); |
| remote_fileio_to_fio_uint ((long) st->st_nlink, fst->fst_nlink); |
| remote_fileio_to_fio_uint ((long) st->st_uid, fst->fst_uid); |
| remote_fileio_to_fio_uint ((long) st->st_gid, fst->fst_gid); |
| remote_fileio_to_fio_uint ((long) st->st_rdev, fst->fst_rdev); |
| remote_fileio_to_fio_ulong ((LONGEST) st->st_size, fst->fst_size); |
| #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
| blksize = st->st_blksize; |
| #else |
| blksize = 512; |
| #endif |
| remote_fileio_to_fio_ulong (blksize, fst->fst_blksize); |
| #if HAVE_STRUCT_STAT_ST_BLOCKS |
| remote_fileio_to_fio_ulong ((LONGEST) st->st_blocks, fst->fst_blocks); |
| #else |
| /* FIXME: This is correct for DJGPP, but other systems that don't |
| have st_blocks, if any, might prefer 512 instead of st_blksize. |
| (eliz, 30-12-2003) */ |
| remote_fileio_to_fio_ulong (((LONGEST) st->st_size + blksize - 1) |
| / blksize, |
| fst->fst_blocks); |
| #endif |
| remote_fileio_to_fio_time (st->st_atime, fst->fst_atime); |
| remote_fileio_to_fio_time (st->st_mtime, fst->fst_mtime); |
| remote_fileio_to_fio_time (st->st_ctime, fst->fst_ctime); |
| } |
| |
| static void |
| remote_fileio_to_fio_timeval (struct timeval *tv, struct fio_timeval *ftv) |
| { |
| remote_fileio_to_fio_time (tv->tv_sec, ftv->ftv_sec); |
| remote_fileio_to_fio_long (tv->tv_usec, ftv->ftv_usec); |
| } |
| |
| static int remote_fio_ctrl_c_flag = 0; |
| static int remote_fio_no_longjmp = 0; |
| |
| #if defined (HAVE_SIGACTION) && defined (SA_RESTART) |
| static struct sigaction remote_fio_sa; |
| static struct sigaction remote_fio_osa; |
| #else |
| static void (*remote_fio_ofunc)(int); |
| #endif |
| |
| static void |
| remote_fileio_sig_init (void) |
| { |
| #if defined (HAVE_SIGACTION) && defined (SA_RESTART) |
| remote_fio_sa.sa_handler = SIG_IGN; |
| sigemptyset (&remote_fio_sa.sa_mask); |
| remote_fio_sa.sa_flags = 0; |
| sigaction (SIGINT, &remote_fio_sa, &remote_fio_osa); |
| #else |
| remote_fio_ofunc = signal (SIGINT, SIG_IGN); |
| #endif |
| } |
| |
| static void |
| remote_fileio_sig_set (void (*sigint_func)(int)) |
| { |
| #if defined (HAVE_SIGACTION) && defined (SA_RESTART) |
| remote_fio_sa.sa_handler = sigint_func; |
| sigemptyset (&remote_fio_sa.sa_mask); |
| remote_fio_sa.sa_flags = 0; |
| sigaction (SIGINT, &remote_fio_sa, NULL); |
| #else |
| signal (SIGINT, sigint_func); |
| #endif |
| } |
| |
| static void |
| remote_fileio_sig_exit (void) |
| { |
| #if defined (HAVE_SIGACTION) && defined (SA_RESTART) |
| sigaction (SIGINT, &remote_fio_osa, NULL); |
| #else |
| signal (SIGINT, remote_fio_ofunc); |
| #endif |
| } |
| |
| static void |
| async_remote_fileio_interrupt (gdb_client_data arg) |
| { |
| deprecated_throw_reason (RETURN_QUIT); |
| } |
| |
| static void |
| remote_fileio_ctrl_c_signal_handler (int signo) |
| { |
| remote_fileio_sig_set (SIG_IGN); |
| remote_fio_ctrl_c_flag = 1; |
| if (!remote_fio_no_longjmp) |
| gdb_call_async_signal_handler (sigint_fileio_token, 1); |
| remote_fileio_sig_set (remote_fileio_ctrl_c_signal_handler); |
| } |
| |
| static void |
| remote_fileio_reply (int retcode, int error) |
| { |
| char buf[32]; |
| |
| remote_fileio_sig_set (SIG_IGN); |
| strcpy (buf, "F"); |
| if (retcode < 0) |
| { |
| strcat (buf, "-"); |
| retcode = -retcode; |
| } |
| sprintf (buf + strlen (buf), "%x", retcode); |
| if (error || remote_fio_ctrl_c_flag) |
| { |
| if (error && remote_fio_ctrl_c_flag) |
| error = FILEIO_EINTR; |
| if (error < 0) |
| { |
| strcat (buf, "-"); |
| error = -error; |
| } |
| sprintf (buf + strlen (buf), ",%x", error); |
| if (remote_fio_ctrl_c_flag) |
| strcat (buf, ",C"); |
| } |
| remote_fileio_sig_set (remote_fileio_ctrl_c_signal_handler); |
| putpkt (buf); |
| } |
| |
| static void |
| remote_fileio_ioerror (void) |
| { |
| remote_fileio_reply (-1, FILEIO_EIO); |
| } |
| |
| static void |
| remote_fileio_badfd (void) |
| { |
| remote_fileio_reply (-1, FILEIO_EBADF); |
| } |
| |
| static void |
| remote_fileio_return_errno (int retcode) |
| { |
| remote_fileio_reply (retcode, retcode < 0 |
| ? remote_fileio_errno_to_target (errno) : 0); |
| } |
| |
| static void |
| remote_fileio_return_success (int retcode) |
| { |
| remote_fileio_reply (retcode, 0); |
| } |
| |
| static void |
| remote_fileio_func_open (char *buf) |
| { |
| CORE_ADDR ptrval; |
| int length; |
| long num; |
| int flags, fd; |
| mode_t mode; |
| char *pathname; |
| struct stat st; |
| |
| /* 1. Parameter: Ptr to pathname / length incl. trailing zero. */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| /* 2. Parameter: open flags */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| flags = remote_fileio_oflags_to_host (num); |
| /* 3. Parameter: open mode */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| mode = remote_fileio_mode_to_host (num, 1); |
| |
| /* Request pathname. */ |
| pathname = alloca (length); |
| if (target_read_memory (ptrval, (gdb_byte *) pathname, length) != 0) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| |
| /* Check if pathname exists and is not a regular file or directory. If so, |
| return an appropriate error code. Same for trying to open directories |
| for writing. */ |
| if (!stat (pathname, &st)) |
| { |
| if (!S_ISREG (st.st_mode) && !S_ISDIR (st.st_mode)) |
| { |
| remote_fileio_reply (-1, FILEIO_ENODEV); |
| return; |
| } |
| if (S_ISDIR (st.st_mode) |
| && ((flags & O_WRONLY) == O_WRONLY || (flags & O_RDWR) == O_RDWR)) |
| { |
| remote_fileio_reply (-1, FILEIO_EISDIR); |
| return; |
| } |
| } |
| |
| remote_fio_no_longjmp = 1; |
| fd = open (pathname, flags, mode); |
| if (fd < 0) |
| { |
| remote_fileio_return_errno (-1); |
| return; |
| } |
| |
| fd = remote_fileio_fd_to_targetfd (fd); |
| remote_fileio_return_success (fd); |
| } |
| |
| static void |
| remote_fileio_func_close (char *buf) |
| { |
| long num; |
| int fd; |
| |
| /* Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| fd = remote_fileio_map_fd ((int) num); |
| if (fd == FIO_FD_INVALID) |
| { |
| remote_fileio_badfd (); |
| return; |
| } |
| |
| remote_fio_no_longjmp = 1; |
| if (fd != FIO_FD_CONSOLE_IN && fd != FIO_FD_CONSOLE_OUT && close (fd)) |
| remote_fileio_return_errno (-1); |
| remote_fileio_close_target_fd ((int) num); |
| remote_fileio_return_success (0); |
| } |
| |
| static void |
| remote_fileio_func_read (char *buf) |
| { |
| long target_fd, num; |
| LONGEST lnum; |
| CORE_ADDR ptrval; |
| int fd, ret; |
| gdb_byte *buffer; |
| size_t length; |
| off_t old_offset, new_offset; |
| |
| /* 1. Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &target_fd)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| fd = remote_fileio_map_fd ((int) target_fd); |
| if (fd == FIO_FD_INVALID) |
| { |
| remote_fileio_badfd (); |
| return; |
| } |
| /* 2. Parameter: buffer pointer */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| ptrval = (CORE_ADDR) lnum; |
| /* 3. Parameter: buffer length */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| length = (size_t) num; |
| |
| switch (fd) |
| { |
| case FIO_FD_CONSOLE_OUT: |
| remote_fileio_badfd (); |
| return; |
| case FIO_FD_CONSOLE_IN: |
| { |
| static char *remaining_buf = NULL; |
| static int remaining_length = 0; |
| |
| buffer = (gdb_byte *) xmalloc (16384); |
| if (remaining_buf) |
| { |
| remote_fio_no_longjmp = 1; |
| if (remaining_length > length) |
| { |
| memcpy (buffer, remaining_buf, length); |
| memmove (remaining_buf, remaining_buf + length, |
| remaining_length - length); |
| remaining_length -= length; |
| ret = length; |
| } |
| else |
| { |
| memcpy (buffer, remaining_buf, remaining_length); |
| xfree (remaining_buf); |
| remaining_buf = NULL; |
| ret = remaining_length; |
| } |
| } |
| else |
| { |
| /* Windows (at least XP and Server 2003) has difficulty |
| with large reads from consoles. If a handle is |
| backed by a real console device, overly large reads |
| from the handle will fail and set errno == ENOMEM. |
| On a Windows Server 2003 system where I tested, |
| reading 26608 bytes from the console was OK, but |
| anything above 26609 bytes would fail. The limit has |
| been observed to vary on different systems. So, we |
| limit this read to something smaller than that - by a |
| safe margin, in case the limit depends on system |
| resources or version. */ |
| ret = ui_file_read (gdb_stdtargin, (char *) buffer, 16383); |
| remote_fio_no_longjmp = 1; |
| if (ret > 0 && (size_t)ret > length) |
| { |
| remaining_buf = (char *) xmalloc (ret - length); |
| remaining_length = ret - length; |
| memcpy (remaining_buf, buffer + length, remaining_length); |
| ret = length; |
| } |
| } |
| } |
| break; |
| default: |
| buffer = (gdb_byte *) xmalloc (length); |
| /* POSIX defines EINTR behaviour of read in a weird way. It's allowed |
| for read() to return -1 even if "some" bytes have been read. It |
| has been corrected in SUSv2 but that doesn't help us much... |
| Therefore a complete solution must check how many bytes have been |
| read on EINTR to return a more reliable value to the target */ |
| old_offset = lseek (fd, 0, SEEK_CUR); |
| remote_fio_no_longjmp = 1; |
| ret = read (fd, buffer, length); |
| if (ret < 0 && errno == EINTR) |
| { |
| new_offset = lseek (fd, 0, SEEK_CUR); |
| /* If some data has been read, return the number of bytes read. |
| The Ctrl-C flag is set in remote_fileio_reply() anyway. */ |
| if (old_offset != new_offset) |
| ret = new_offset - old_offset; |
| } |
| break; |
| } |
| |
| if (ret > 0) |
| { |
| errno = target_write_memory (ptrval, buffer, ret); |
| if (errno != 0) |
| ret = -1; |
| } |
| |
| if (ret < 0) |
| remote_fileio_return_errno (-1); |
| else |
| remote_fileio_return_success (ret); |
| |
| xfree (buffer); |
| } |
| |
| static void |
| remote_fileio_func_write (char *buf) |
| { |
| long target_fd, num; |
| LONGEST lnum; |
| CORE_ADDR ptrval; |
| int fd, ret; |
| gdb_byte *buffer; |
| size_t length; |
| |
| /* 1. Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &target_fd)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| fd = remote_fileio_map_fd ((int) target_fd); |
| if (fd == FIO_FD_INVALID) |
| { |
| remote_fileio_badfd (); |
| return; |
| } |
| /* 2. Parameter: buffer pointer */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| ptrval = (CORE_ADDR) lnum; |
| /* 3. Parameter: buffer length */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| length = (size_t) num; |
| |
| buffer = (gdb_byte *) xmalloc (length); |
| if (target_read_memory (ptrval, buffer, length) != 0) |
| { |
| xfree (buffer); |
| remote_fileio_ioerror (); |
| return; |
| } |
| |
| remote_fio_no_longjmp = 1; |
| switch (fd) |
| { |
| case FIO_FD_CONSOLE_IN: |
| remote_fileio_badfd (); |
| xfree (buffer); |
| return; |
| case FIO_FD_CONSOLE_OUT: |
| ui_file_write (target_fd == 1 ? gdb_stdtarg : gdb_stdtargerr, |
| (char *) buffer, length); |
| gdb_flush (target_fd == 1 ? gdb_stdtarg : gdb_stdtargerr); |
| ret = length; |
| break; |
| default: |
| ret = write (fd, buffer, length); |
| if (ret < 0 && errno == EACCES) |
| errno = EBADF; /* Cygwin returns EACCESS when writing to a |
| R/O file. */ |
| break; |
| } |
| |
| if (ret < 0) |
| remote_fileio_return_errno (-1); |
| else |
| remote_fileio_return_success (ret); |
| |
| xfree (buffer); |
| } |
| |
| static void |
| remote_fileio_func_lseek (char *buf) |
| { |
| long num; |
| LONGEST lnum; |
| int fd, flag; |
| off_t offset, ret; |
| |
| /* 1. Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| fd = remote_fileio_map_fd ((int) num); |
| if (fd == FIO_FD_INVALID) |
| { |
| remote_fileio_badfd (); |
| return; |
| } |
| else if (fd == FIO_FD_CONSOLE_IN || fd == FIO_FD_CONSOLE_OUT) |
| { |
| remote_fileio_reply (-1, FILEIO_ESPIPE); |
| return; |
| } |
| |
| /* 2. Parameter: offset */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| offset = (off_t) lnum; |
| /* 3. Parameter: flag */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| if (remote_fileio_seek_flag_to_host (num, &flag)) |
| { |
| remote_fileio_reply (-1, FILEIO_EINVAL); |
| return; |
| } |
| |
| remote_fio_no_longjmp = 1; |
| ret = lseek (fd, offset, flag); |
| |
| if (ret == (off_t) -1) |
| remote_fileio_return_errno (-1); |
| else |
| remote_fileio_return_success (ret); |
| } |
| |
| static void |
| remote_fileio_func_rename (char *buf) |
| { |
| CORE_ADDR old_ptr, new_ptr; |
| int old_len, new_len; |
| char *oldpath, *newpath; |
| int ret, of, nf; |
| struct stat ost, nst; |
| |
| /* 1. Parameter: Ptr to oldpath / length incl. trailing zero */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &old_ptr, &old_len)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| |
| /* 2. Parameter: Ptr to newpath / length incl. trailing zero */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &new_ptr, &new_len)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| |
| /* Request oldpath using 'm' packet */ |
| oldpath = alloca (old_len); |
| if (target_read_memory (old_ptr, (gdb_byte *) oldpath, old_len) != 0) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| |
| /* Request newpath using 'm' packet */ |
| newpath = alloca (new_len); |
| if (target_read_memory (new_ptr, (gdb_byte *) newpath, new_len) != 0) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| |
| /* Only operate on regular files and directories. */ |
| of = stat (oldpath, &ost); |
| nf = stat (newpath, &nst); |
| if ((!of && !S_ISREG (ost.st_mode) && !S_ISDIR (ost.st_mode)) |
| || (!nf && !S_ISREG (nst.st_mode) && !S_ISDIR (nst.st_mode))) |
| { |
| remote_fileio_reply (-1, FILEIO_EACCES); |
| return; |
| } |
| |
| remote_fio_no_longjmp = 1; |
| ret = rename (oldpath, newpath); |
| |
| if (ret == -1) |
| { |
| /* Special case: newpath is a non-empty directory. Some systems |
| return ENOTEMPTY, some return EEXIST. We coerce that to be |
| always EEXIST. */ |
| if (errno == ENOTEMPTY) |
| errno = EEXIST; |
| #ifdef __CYGWIN__ |
| /* Workaround some Cygwin problems with correct errnos. */ |
| if (errno == EACCES) |
| { |
| if (!of && !nf && S_ISDIR (nst.st_mode)) |
| { |
| if (S_ISREG (ost.st_mode)) |
| errno = EISDIR; |
| else |
| { |
| char oldfullpath[PATH_MAX]; |
| char newfullpath[PATH_MAX]; |
| int len; |
| |
| cygwin_conv_path (CCP_WIN_A_TO_POSIX, oldpath, oldfullpath, |
| PATH_MAX); |
| cygwin_conv_path (CCP_WIN_A_TO_POSIX, newpath, newfullpath, |
| PATH_MAX); |
| len = strlen (oldfullpath); |
| if (IS_DIR_SEPARATOR (newfullpath[len]) |
| && !filename_ncmp (oldfullpath, newfullpath, len)) |
| errno = EINVAL; |
| else |
| errno = EEXIST; |
| } |
| } |
| } |
| #endif |
| |
| remote_fileio_return_errno (-1); |
| } |
| else |
| remote_fileio_return_success (ret); |
| } |
| |
| static void |
| remote_fileio_func_unlink (char *buf) |
| { |
| CORE_ADDR ptrval; |
| int length; |
| char *pathname; |
| int ret; |
| struct stat st; |
| |
| /* Parameter: Ptr to pathname / length incl. trailing zero */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| /* Request pathname using 'm' packet */ |
| pathname = alloca (length); |
| if (target_read_memory (ptrval, (gdb_byte *) pathname, length) != 0) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| |
| /* Only operate on regular files (and directories, which allows to return |
| the correct return code). */ |
| if (!stat (pathname, &st) && !S_ISREG (st.st_mode) && !S_ISDIR (st.st_mode)) |
| { |
| remote_fileio_reply (-1, FILEIO_ENODEV); |
| return; |
| } |
| |
| remote_fio_no_longjmp = 1; |
| ret = unlink (pathname); |
| |
| if (ret == -1) |
| remote_fileio_return_errno (-1); |
| else |
| remote_fileio_return_success (ret); |
| } |
| |
| static void |
| remote_fileio_func_stat (char *buf) |
| { |
| CORE_ADDR statptr, nameptr; |
| int ret, namelength; |
| char *pathname; |
| LONGEST lnum; |
| struct stat st; |
| struct fio_stat fst; |
| |
| /* 1. Parameter: Ptr to pathname / length incl. trailing zero */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &nameptr, &namelength)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| |
| /* 2. Parameter: Ptr to struct stat */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| statptr = (CORE_ADDR) lnum; |
| |
| /* Request pathname using 'm' packet */ |
| pathname = alloca (namelength); |
| if (target_read_memory (nameptr, (gdb_byte *) pathname, namelength) != 0) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| |
| remote_fio_no_longjmp = 1; |
| ret = stat (pathname, &st); |
| |
| if (ret == -1) |
| { |
| remote_fileio_return_errno (-1); |
| return; |
| } |
| /* Only operate on regular files and directories. */ |
| if (!ret && !S_ISREG (st.st_mode) && !S_ISDIR (st.st_mode)) |
| { |
| remote_fileio_reply (-1, FILEIO_EACCES); |
| return; |
| } |
| if (statptr) |
| { |
| remote_fileio_to_fio_stat (&st, &fst); |
| remote_fileio_to_fio_uint (0, fst.fst_dev); |
| |
| errno = target_write_memory (statptr, (gdb_byte *) &fst, sizeof fst); |
| if (errno != 0) |
| { |
| remote_fileio_return_errno (-1); |
| return; |
| } |
| } |
| remote_fileio_return_success (ret); |
| } |
| |
| static void |
| remote_fileio_func_fstat (char *buf) |
| { |
| CORE_ADDR ptrval; |
| int fd, ret; |
| long target_fd; |
| LONGEST lnum; |
| struct stat st; |
| struct fio_stat fst; |
| struct timeval tv; |
| |
| /* 1. Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &target_fd)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| fd = remote_fileio_map_fd ((int) target_fd); |
| if (fd == FIO_FD_INVALID) |
| { |
| remote_fileio_badfd (); |
| return; |
| } |
| /* 2. Parameter: Ptr to struct stat */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| ptrval = (CORE_ADDR) lnum; |
| |
| remote_fio_no_longjmp = 1; |
| if (fd == FIO_FD_CONSOLE_IN || fd == FIO_FD_CONSOLE_OUT) |
| { |
| remote_fileio_to_fio_uint (1, fst.fst_dev); |
| memset (&st, 0, sizeof (st)); |
| st.st_mode = S_IFCHR | (fd == FIO_FD_CONSOLE_IN ? S_IRUSR : S_IWUSR); |
| st.st_nlink = 1; |
| #ifdef HAVE_GETUID |
| st.st_uid = getuid (); |
| #endif |
| #ifdef HAVE_GETGID |
| st.st_gid = getgid (); |
| #endif |
| #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
| st.st_blksize = 512; |
| #endif |
| #if HAVE_STRUCT_STAT_ST_BLOCKS |
| st.st_blocks = 0; |
| #endif |
| if (!gettimeofday (&tv, NULL)) |
| st.st_atime = st.st_mtime = st.st_ctime = tv.tv_sec; |
| else |
| st.st_atime = st.st_mtime = st.st_ctime = (time_t) 0; |
| ret = 0; |
| } |
| else |
| ret = fstat (fd, &st); |
| |
| if (ret == -1) |
| { |
| remote_fileio_return_errno (-1); |
| return; |
| } |
| if (ptrval) |
| { |
| remote_fileio_to_fio_stat (&st, &fst); |
| |
| errno = target_write_memory (ptrval, (gdb_byte *) &fst, sizeof fst); |
| if (errno != 0) |
| { |
| remote_fileio_return_errno (-1); |
| return; |
| } |
| } |
| remote_fileio_return_success (ret); |
| } |
| |
| static void |
| remote_fileio_func_gettimeofday (char *buf) |
| { |
| LONGEST lnum; |
| CORE_ADDR ptrval; |
| int ret; |
| struct timeval tv; |
| struct fio_timeval ftv; |
| |
| /* 1. Parameter: struct timeval pointer */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| ptrval = (CORE_ADDR) lnum; |
| /* 2. Parameter: some pointer value... */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| /* ...which has to be NULL. */ |
| if (lnum) |
| { |
| remote_fileio_reply (-1, FILEIO_EINVAL); |
| return; |
| } |
| |
| remote_fio_no_longjmp = 1; |
| ret = gettimeofday (&tv, NULL); |
| |
| if (ret == -1) |
| { |
| remote_fileio_return_errno (-1); |
| return; |
| } |
| |
| if (ptrval) |
| { |
| remote_fileio_to_fio_timeval (&tv, &ftv); |
| |
| errno = target_write_memory (ptrval, (gdb_byte *) &ftv, sizeof ftv); |
| if (errno != 0) |
| { |
| remote_fileio_return_errno (-1); |
| return; |
| } |
| } |
| remote_fileio_return_success (ret); |
| } |
| |
| static void |
| remote_fileio_func_isatty (char *buf) |
| { |
| long target_fd; |
| int fd; |
| |
| /* Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &target_fd)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| remote_fio_no_longjmp = 1; |
| fd = remote_fileio_map_fd ((int) target_fd); |
| remote_fileio_return_success (fd == FIO_FD_CONSOLE_IN || |
| fd == FIO_FD_CONSOLE_OUT ? 1 : 0); |
| } |
| |
| static void |
| remote_fileio_func_system (char *buf) |
| { |
| CORE_ADDR ptrval; |
| int ret, length; |
| char *cmdline = NULL; |
| |
| /* Parameter: Ptr to commandline / length incl. trailing zero */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length)) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| |
| if (length) |
| { |
| /* Request commandline using 'm' packet */ |
| cmdline = alloca (length); |
| if (target_read_memory (ptrval, (gdb_byte *) cmdline, length) != 0) |
| { |
| remote_fileio_ioerror (); |
| return; |
| } |
| } |
| |
| /* Check if system(3) has been explicitely allowed using the |
| `set remote system-call-allowed 1' command. If length is 0, |
| indicating a NULL parameter to the system call, return zero to |
| indicate a shell is not available. Otherwise fail with EPERM. */ |
| if (!remote_fio_system_call_allowed) |
| { |
| if (!length) |
| remote_fileio_return_success (0); |
| else |
| remote_fileio_reply (-1, FILEIO_EPERM); |
| return; |
| } |
| |
| remote_fio_no_longjmp = 1; |
| ret = system (cmdline); |
| |
| if (!length) |
| remote_fileio_return_success (ret); |
| else if (ret == -1) |
| remote_fileio_return_errno (-1); |
| else |
| remote_fileio_return_success (WEXITSTATUS (ret)); |
| } |
| |
| static struct { |
| char *name; |
| void (*func)(char *); |
| } remote_fio_func_map[] = { |
| { "open", remote_fileio_func_open }, |
| { "close", remote_fileio_func_close }, |
| { "read", remote_fileio_func_read }, |
| { "write", remote_fileio_func_write }, |
| { "lseek", remote_fileio_func_lseek }, |
| { "rename", remote_fileio_func_rename }, |
| { "unlink", remote_fileio_func_unlink }, |
| { "stat", remote_fileio_func_stat }, |
| { "fstat", remote_fileio_func_fstat }, |
| { "gettimeofday", remote_fileio_func_gettimeofday }, |
| { "isatty", remote_fileio_func_isatty }, |
| { "system", remote_fileio_func_system }, |
| { NULL, NULL } |
| }; |
| |
| static int |
| do_remote_fileio_request (struct ui_out *uiout, void *buf_arg) |
| { |
| char *buf = buf_arg; |
| char *c; |
| int idx; |
| |
| remote_fileio_sig_set (remote_fileio_ctrl_c_signal_handler); |
| |
| c = strchr (++buf, ','); |
| if (c) |
| *c++ = '\0'; |
| else |
| c = strchr (buf, '\0'); |
| for (idx = 0; remote_fio_func_map[idx].name; ++idx) |
| if (!strcmp (remote_fio_func_map[idx].name, buf)) |
| break; |
| if (!remote_fio_func_map[idx].name) /* ERROR: No such function. */ |
| return RETURN_ERROR; |
| remote_fio_func_map[idx].func (c); |
| return 0; |
| } |
| |
| /* Close any open descriptors, and reinitialize the file mapping. */ |
| |
| void |
| remote_fileio_reset (void) |
| { |
| int ix; |
| |
| for (ix = 0; ix != remote_fio_data.fd_map_size; ix++) |
| { |
| int fd = remote_fio_data.fd_map[ix]; |
| |
| if (fd >= 0) |
| close (fd); |
| } |
| if (remote_fio_data.fd_map) |
| { |
| xfree (remote_fio_data.fd_map); |
| remote_fio_data.fd_map = NULL; |
| remote_fio_data.fd_map_size = 0; |
| } |
| } |
| |
| /* Handle a file I/O request. BUF points to the packet containing the |
| request. CTRLC_PENDING_P should be nonzero if the target has not |
| acknowledged the Ctrl-C sent asynchronously earlier. */ |
| |
| void |
| remote_fileio_request (char *buf, int ctrlc_pending_p) |
| { |
| int ex; |
| |
| remote_fileio_sig_init (); |
| |
| if (ctrlc_pending_p) |
| { |
| /* If the target hasn't responded to the Ctrl-C sent |
| asynchronously earlier, take this opportunity to send the |
| Ctrl-C synchronously. */ |
| remote_fio_ctrl_c_flag = 1; |
| remote_fio_no_longjmp = 0; |
| remote_fileio_reply (-1, FILEIO_EINTR); |
| } |
| else |
| { |
| remote_fio_ctrl_c_flag = 0; |
| remote_fio_no_longjmp = 0; |
| |
| ex = catch_exceptions (current_uiout, |
| do_remote_fileio_request, (void *)buf, |
| RETURN_MASK_ALL); |
| switch (ex) |
| { |
| case RETURN_ERROR: |
| remote_fileio_reply (-1, FILEIO_ENOSYS); |
| break; |
| case RETURN_QUIT: |
| remote_fileio_reply (-1, FILEIO_EINTR); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| remote_fileio_sig_exit (); |
| } |
| |
| static void |
| set_system_call_allowed (char *args, int from_tty) |
| { |
| if (args) |
| { |
| char *arg_end; |
| int val = strtoul (args, &arg_end, 10); |
| |
| if (*args && *arg_end == '\0') |
| { |
| remote_fio_system_call_allowed = !!val; |
| return; |
| } |
| } |
| error (_("Illegal argument for \"set remote system-call-allowed\" command")); |
| } |
| |
| static void |
| show_system_call_allowed (char *args, int from_tty) |
| { |
| if (args) |
| error (_("Garbage after \"show remote " |
| "system-call-allowed\" command: `%s'"), args); |
| printf_unfiltered ("Calling host system(3) call from target is %sallowed\n", |
| remote_fio_system_call_allowed ? "" : "not "); |
| } |
| |
| void |
| initialize_remote_fileio (struct cmd_list_element *remote_set_cmdlist, |
| struct cmd_list_element *remote_show_cmdlist) |
| { |
| sigint_fileio_token = |
| create_async_signal_handler (async_remote_fileio_interrupt, NULL); |
| |
| add_cmd ("system-call-allowed", no_class, |
| set_system_call_allowed, |
| _("Set if the host system(3) call is allowed for the target."), |
| &remote_set_cmdlist); |
| add_cmd ("system-call-allowed", no_class, |
| show_system_call_allowed, |
| _("Show if the host system(3) call is allowed for the target."), |
| &remote_show_cmdlist); |
| } |