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21.1.3 SVR4 Process Information

Many versions of SVR4 and compatible systems provide a facility called ‘/proc’ that can be used to examine the image of a running process using file-system subroutines.

If GDB is configured for an operating system with this facility, the command info proc is available to report information about the process running your program, or about any process running on your system. This includes, as of this writing, GNU/Linux, OSF/1 (Digital Unix), Solaris, and Irix, but not HP-UX, for example.

This command may also work on core files that were created on a system that has the ‘/proc’ facility.

info proc
info proc process-id

Summarize available information about any running 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 specific to GNU/Linux.

info proc cwd

Show the current working directory of the process. This command is specific to GNU/Linux.

info proc exe

Show the name of executable of the process. This command is specific to GNU/Linux.

info proc mappings

Report the memory address space ranges accessible in the program, with information on whether the process has read, write, or execute access rights to each range. On GNU/Linux systems, each memory range includes the object file which is mapped to that range, instead of the memory access rights to that range.

info proc stat
info proc status

These subcommands are specific to GNU/Linux systems. They show the process-related information, including the user ID and group ID; how many threads are there in the process; its 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. For more information, see the ‘proc’ man page (type man 5 proc from your shell prompt).

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.


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