| Debugging with GDB: SVR4 Process Information |
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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 and Solaris, 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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