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 and Solaris, 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 procinfo 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 statinfo 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-entryproc-trace-exitproc-untrace-entryproc-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.