From 26d6cec4a9291f154e549fb6f4318ace6cfaa2a5 Mon Sep 17 00:00:00 2001 From: Andreas Arnez Date: Thu, 22 Mar 2018 10:02:18 +0100 Subject: [PATCH] Make "info proc cmdline" show args on GNU/Linux Currently "info proc cmdline" on GNU/Linux does not show the full command line, but only argument 0. And even a warning is shown if there are more. This was discussed in 2014 already: https://sourceware.org/ml/gdb-patches/2014-04/msg00212.html Follow the advice there and avoid target_fileio_read_stralloc. Instead, use target_fileio_read_alloc to read the whole command line and then replace NUL characters by spaces. Also add an appropriate test case. Note that gdbserver already handles this correctly. gdb/ChangeLog: * linux-tdep.c (linux_info_proc): For "info proc cmdline", print command line args instead of emitting a warning. gdb/testsuite/ChangeLog: * gdb.base/info-proc.exp: Add test for "info proc cmdline". --- gdb/ChangeLog | 5 +++++ gdb/linux-tdep.c | 20 ++++++++++++++++---- gdb/testsuite/ChangeLog | 4 ++++ gdb/testsuite/gdb.base/info-proc.exp | 13 +++++++++++++ 4 files changed, 38 insertions(+), 4 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 9b41fe1862b..f1699093e83 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2018-03-22 Andreas Arnez + + * linux-tdep.c (linux_info_proc): For "info proc cmdline", print + command line args instead of emitting a warning. + 2018-03-22 Simon Marchi * tracepoint.h (struct static_tracepoint_marker): Initialize diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c index b4b87dd8af8..0ac78c22f98 100644 --- a/gdb/linux-tdep.c +++ b/gdb/linux-tdep.c @@ -754,10 +754,22 @@ linux_info_proc (struct gdbarch *gdbarch, const char *args, if (cmdline_f) { xsnprintf (filename, sizeof filename, "/proc/%ld/cmdline", pid); - gdb::unique_xmalloc_ptr cmdline - = target_fileio_read_stralloc (NULL, filename); - if (cmdline) - printf_filtered ("cmdline = '%s'\n", cmdline.get ()); + gdb_byte *buffer; + ssize_t len = target_fileio_read_alloc (NULL, filename, &buffer); + + if (len > 0) + { + gdb::unique_xmalloc_ptr cmdline ((char *) buffer); + ssize_t pos; + + for (pos = 0; pos < len - 1; pos++) + { + if (buffer[pos] == '\0') + buffer[pos] = ' '; + } + buffer[len - 1] = '\0'; + printf_filtered ("cmdline = '%s'\n", buffer); + } else warning (_("unable to open /proc file '%s'"), filename); } diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index ca0dadf36b4..bbd09912af5 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,7 @@ +2018-03-22 Andreas Arnez + + * gdb.base/info-proc.exp: Add test for "info proc cmdline". + 2018-03-20 Stephen Roberts * gdb.perf/template-breakpoints.cc: New file. diff --git a/gdb/testsuite/gdb.base/info-proc.exp b/gdb/testsuite/gdb.base/info-proc.exp index 72355bfef02..7dbf7406458 100644 --- a/gdb/testsuite/gdb.base/info-proc.exp +++ b/gdb/testsuite/gdb.base/info-proc.exp @@ -38,6 +38,16 @@ gdb_test_multiple "info proc" "info proc without a process" { } } +# Set command line arguments to be verified later with "info proc +# cmdline". However, if we're using a stub, then "set args" would not +# have any effect, so then just skip this. + +set cmdline "" +if { ! [use_gdb_stub] } { + set cmdline "-i foo bar -o baz 1234" + gdb_test_no_output "set args $cmdline" "set args" +} + if { ! [ runto_main ] } then { untested "could not run to main" return -1 @@ -50,6 +60,9 @@ gdb_test "info proc mapping" \ "info proc mapping" if {[istarget "*-*-linux*"]} { + if { $cmdline != "" } { + gdb_test "info proc cmdline" "cmdline = '.* $cmdline'" + } set gcorefile [standard_output_file $testfile.gcore] if {[gdb_gcore_cmd $gcorefile "save a core file"]} { clean_restart $binfile -- 2.30.2