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 available from cores created on GNU/Linux and FreeBSD systems.
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 all
Show all the information about the process described under all of the
info proc subcommands.
This command enables and disables tracing of
procfs API calls.
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
Show the file to which
procfs API trace is written.
These commands enable and disable tracing of entries into and exits
For QNX Neutrino only, this command displays the list of all the processes and all the threads within each process.
For QNX Neutrino only, this command displays the list of all mapinfos.