Implement mount namespace support for native Linux targets
This commit allows GDB to access executables and shared libraries on native Linux targets where GDB and the inferior have different mount namespaces. gdb/ChangeLog: * linux-nat.c (nat/linux-namespaces.h): New include. (fileio.h): Likewise. (linux_nat_filesystem_is_local): New function. (linux_nat_fileio_pid_of): Likewise. (linux_nat_fileio_open): Likewise. (linux_nat_fileio_readlink): Likewise. (linux_nat_fileio_unlink): Likewise. (linux_nat_add_target): Initialize to_filesystem_is_local, to_fileio_open, to_fileio_readlink and to_fileio_unlink. (_initialize_linux_nat): New "set/show debug linux-namespaces" commands. * NEWS: Mention new "set/show debug linux-namespaces" commands. gdb/doc/ChangeLog: * gdb.texinfo (Debugging Output): Document the "set/show debug linux-namespaces" command.
This commit is contained in:
Gary Benson
parent
07c138c8ae
commit
7a6a173129
5 changed files with 143 additions and 0 deletions
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@ -1,3 +1,18 @@
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2015-06-10 Gary Benson <gbenson@redhat.com>
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* linux-nat.c (nat/linux-namespaces.h): New include.
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(fileio.h): Likewise.
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(linux_nat_filesystem_is_local): New function.
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(linux_nat_fileio_pid_of): Likewise.
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(linux_nat_fileio_open): Likewise.
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(linux_nat_fileio_readlink): Likewise.
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(linux_nat_fileio_unlink): Likewise.
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(linux_nat_add_target): Initialize to_filesystem_is_local,
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to_fileio_open, to_fileio_readlink and to_fileio_unlink.
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(_initialize_linux_nat): New "set/show debug linux-namespaces"
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commands.
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* NEWS: Mention new "set/show debug linux-namespaces" commands.
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2015-06-10 Gary Benson <gbenson@redhat.com>
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* target.h (struct inferior): New forward declaration.
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4
gdb/NEWS
4
gdb/NEWS
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@ -137,6 +137,10 @@ set|show record btrace bts buffer-size
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The obtained size may differ from the requested size. Use "info
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record" to see the obtained buffer size.
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set debug linux-namespaces
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show debug linux-namespaces
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Control display of debugging info regarding Linux namespaces.
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* The command 'thread apply all' can now support new option '-ascending'
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to call its specified command for all threads in ascending order.
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@ -1,3 +1,8 @@
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2015-06-10 Gary Benson <gbenson@redhat.com>
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* gdb.texinfo (Debugging Output): Document the "set/show debug
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linux-namespaces" command.
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2015-06-10 Walfred Tedeschi <walfred.tedeschi@intel.com>
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Mircea Gherzan <mircea.gherzan@intel.com>
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@ -23502,6 +23502,11 @@ Displays the current state of @value{GDBN} JIT debugging.
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Turns on or off debugging messages from the Linux LWP debug support.
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@item show debug lin-lwp
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Show the current state of Linux LWP debugging messages.
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@item set debug linux-namespaces
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@cindex @sc{gnu}/Linux namespaces debug messages
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Turns on or off debugging messages from the Linux namespaces debug support.
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@item show debug linux-namespaces
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Show the current state of Linux namespaces debugging messages.
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@item set debug mach-o
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@cindex Mach-O symbols processing
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Control display of debugging messages related to Mach-O symbols
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114
gdb/linux-nat.c
114
gdb/linux-nat.c
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@ -66,6 +66,8 @@
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#include "target-descriptions.h"
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#include "filestuff.h"
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#include "objfiles.h"
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#include "nat/linux-namespaces.h"
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#include "fileio.h"
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#ifndef SPUFS_MAGIC
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#define SPUFS_MAGIC 0x23c9b64e
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@ -4868,6 +4870,104 @@ linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid)
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return -1;
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}
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/* Implementation of to_filesystem_is_local. */
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static int
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linux_nat_filesystem_is_local (struct target_ops *ops)
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{
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struct inferior *inf = current_inferior ();
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if (inf->fake_pid_p || inf->pid == 0)
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return 1;
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return linux_ns_same (inf->pid, LINUX_NS_MNT);
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}
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/* Convert the INF argument passed to a to_fileio_* method
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to a process ID suitable for passing to its corresponding
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linux_mntns_* function. If INF is non-NULL then the
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caller is requesting the filesystem seen by INF. If INF
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is NULL then the caller is requesting the filesystem seen
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by the GDB. We fall back to GDB's filesystem in the case
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that INF is non-NULL but its PID is unknown. */
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static pid_t
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linux_nat_fileio_pid_of (struct inferior *inf)
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{
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if (inf == NULL || inf->fake_pid_p || inf->pid == 0)
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return getpid ();
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else
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return inf->pid;
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}
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/* Implementation of to_fileio_open. */
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static int
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linux_nat_fileio_open (struct target_ops *self,
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struct inferior *inf, const char *filename,
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int flags, int mode, int *target_errno)
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{
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int nat_flags;
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mode_t nat_mode;
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int fd;
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if (fileio_to_host_openflags (flags, &nat_flags) == -1
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|| fileio_to_host_mode (mode, &nat_mode) == -1)
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{
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*target_errno = FILEIO_EINVAL;
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return -1;
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}
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fd = linux_mntns_open_cloexec (linux_nat_fileio_pid_of (inf),
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filename, nat_flags, nat_mode);
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if (fd == -1)
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*target_errno = host_to_fileio_error (errno);
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return fd;
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}
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/* Implementation of to_fileio_readlink. */
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static char *
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linux_nat_fileio_readlink (struct target_ops *self,
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struct inferior *inf, const char *filename,
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int *target_errno)
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{
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char buf[PATH_MAX];
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int len;
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char *ret;
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len = linux_mntns_readlink (linux_nat_fileio_pid_of (inf),
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filename, buf, sizeof (buf));
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if (len < 0)
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{
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*target_errno = host_to_fileio_error (errno);
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return NULL;
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}
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ret = xmalloc (len + 1);
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memcpy (ret, buf, len);
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ret[len] = '\0';
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return ret;
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}
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/* Implementation of to_fileio_unlink. */
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static int
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linux_nat_fileio_unlink (struct target_ops *self,
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struct inferior *inf, const char *filename,
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int *target_errno)
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{
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int ret;
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ret = linux_mntns_unlink (linux_nat_fileio_pid_of (inf),
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filename);
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if (ret == -1)
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*target_errno = host_to_fileio_error (errno);
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return ret;
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}
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void
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linux_nat_add_target (struct target_ops *t)
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{
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@ -4921,6 +5021,11 @@ linux_nat_add_target (struct target_ops *t)
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t->to_core_of_thread = linux_nat_core_of_thread;
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t->to_filesystem_is_local = linux_nat_filesystem_is_local;
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t->to_fileio_open = linux_nat_fileio_open;
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t->to_fileio_readlink = linux_nat_fileio_readlink;
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t->to_fileio_unlink = linux_nat_fileio_unlink;
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/* We don't change the stratum; this target will sit at
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process_stratum and thread_db will set at thread_stratum. This
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is a little strange, since this is a multi-threaded-capable
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@ -5038,6 +5143,15 @@ Enables printf debugging output."),
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show_debug_linux_nat,
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&setdebuglist, &showdebuglist);
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add_setshow_boolean_cmd ("linux-namespaces", class_maintenance,
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&debug_linux_namespaces, _("\
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Set debugging of GNU/Linux namespaces module."), _("\
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Show debugging of GNU/Linux namespaces module."), _("\
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Enables printf debugging output."),
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NULL,
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NULL,
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&setdebuglist, &showdebuglist);
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/* Save this mask as the default. */
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sigprocmask (SIG_SETMASK, NULL, &normal_mask);
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