gdb: Process Information
21.1.2 Process Information
--------------------------
Some operating systems provide interfaces to fetch additional
information about running processes beyond memory and per-thread
register state. If GDB is configured for an operating system with a
supported interface, the command 'info proc' is available to report
information about the process running your program, or about any process
running on your system.
One supported interface is a facility called '/proc' that can be used
to examine the image of a running process using file-system subroutines.
This facility is supported on GNU/Linux and Solaris systems.
On FreeBSD systems, system control nodes are used to query process
information.
In addition, some systems may provide additional process information
in core files. Note that a core file may include a subset of the
information available from a live process. Process information is
currently avaiable from cores created on GNU/Linux and FreeBSD systems.
'info proc'
'info proc PROCESS-ID'
Summarize available information about a process. If a process ID
is specified by PROCESS-ID, display information about that process;
otherwise display information about the program being debugged.
The summary includes the debugged process ID, the command line used
to invoke it, its current working directory, and its executable
file's absolute file name.
On some systems, PROCESS-ID can be of the form '[PID]/TID' which
specifies a certain thread ID within a process. If the optional
PID part is missing, it means a thread from the process being
debugged (the leading '/' still needs to be present, or else GDB
will interpret the number as a process ID rather than a thread ID).
'info proc cmdline'
Show the original command line of the process. This command is
supported on GNU/Linux and FreeBSD.
'info proc cwd'
Show the current working directory of the process. This command is
supported on GNU/Linux and FreeBSD.
'info proc exe'
Show the name of executable of the process. This command is
supported on GNU/Linux and FreeBSD.
'info proc files'
Show the file descriptors open by the process. For each open file
descriptor, GDB shows its number, type (file, directory, character
device, socket), file pointer offset, and the name of the resource
open on the descriptor. The resource name can be a file name (for
files, directories, and devices) or a protocol followed by socket
address (for network connections). This command is supported on
FreeBSD.
This example shows the open file descriptors for a process using a
tty for standard input and output as well as two network sockets:
(gdb) info proc files 22136
process 22136
Open files:
FD Type Offset Flags Name
text file - r-------- /usr/bin/ssh
ctty chr - rw------- /dev/pts/20
cwd dir - r-------- /usr/home/john
root dir - r-------- /
0 chr 0x32933a4 rw------- /dev/pts/20
1 chr 0x32933a4 rw------- /dev/pts/20
2 chr 0x32933a4 rw------- /dev/pts/20
3 socket 0x0 rw----n-- tcp4 10.0.1.2:53014 -> 10.0.1.10:22
4 socket 0x0 rw------- unix stream:/tmp/ssh-FIt89oAzOn5f/agent.2456
'info proc mappings'
Report the memory address space ranges accessible in a process. On
Solaris and FreeBSD systems, each memory range includes information
on whether the process has read, write, or execute access rights to
each range. On GNU/Linux and FreeBSD systems, each memory range
includes the object file which is mapped to that range.
'info proc stat'
'info proc status'
Show additional process-related information, including the user ID
and group ID; virtual memory usage; the signals that are pending,
blocked, and ignored; its TTY; its consumption of system and user
time; its stack size; its 'nice' value; etc. These commands are
supported on GNU/Linux and FreeBSD.
For GNU/Linux systems, see the 'proc' man page for more information
(type 'man 5 proc' from your shell prompt).
For FreeBSD systems, 'info proc stat' is an alias for 'info proc
status'.
'info proc all'
Show all the information about the process described under all of
the above 'info proc' subcommands.
'set procfs-trace'
This command enables and disables tracing of 'procfs' API calls.
'show procfs-trace'
Show the current state of 'procfs' API call tracing.
'set procfs-file FILE'
Tell GDB to write 'procfs' API trace to the named FILE. GDB
appends the trace info to the previous contents of the file. The
default is to display the trace on the standard output.
'show procfs-file'
Show the file to which 'procfs' API trace is written.
'proc-trace-entry'
'proc-trace-exit'
'proc-untrace-entry'
'proc-untrace-exit'
These commands enable and disable tracing of entries into and exits
from the 'syscall' interface.
'info pidlist'
For QNX Neutrino only, this command displays the list of all the
processes and all the threads within each process.
'info meminfo'
For QNX Neutrino only, this command displays the list of all
mapinfos.
Info Catalog
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gdb: Native
gdb: DJGPP Native