killall, pidof: use argv0 for process matching too

top: show cmdline, not comm field
(fixes problems with re-execed applets showing as processes with name "exe",
and not being found by pidof/killall by applet name)

function                                             old     new   delta
find_pid_by_name                                      98     156     +58
procps_scan                                          692     732     +40
top_main                                            2724    2762     +38
find_pair                                            164     180     +16
collect_int                                          114     123      +9
cmp_main                                             547     555      +8
collect_fork                                         112     119      +7
collect_ctx                                          112     119      +7
read_package_field                                   253     257      +4
passwd_main                                         1983    1985      +2
process_stdin                                        435     433      -2
xstrtoul_range_sfx                                   229     226      -3
get_next_block                                      1852    1849      -3
arith                                               2042    2033      -9
sv_main                                             1236    1226     -10
singlemount                                         4690    4672     -18
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 10/6 up/down: 189/-45)          Total: 144 bytes
   text    data     bss     dec     hex filename
 734789    3028   14400  752217   b7a59 busybox_old
 734933    3028   14400  752361   b7ae9 busybox_unstripped

1 files changed, 11 insertions, 7 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 124b11fa8..e80e76403 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -836,6 +836,8 @@ typedef struct {
         DIR *dir;
 /* Fields are set to 0/NULL if failed to determine (or not requested) */
         char *cmd;
+        char *argv0;
+        /*char *exe;*/
         USE_SELINUX(char *context;)
         /* Everything below must contain no ptrs to malloc'ed data:
          * it is memset(0) for each process in procps_scan() */
@@ -861,13 +863,15 @@ enum {
         PSSCAN_UIDGID   = 1 << 4,
         PSSCAN_COMM     = 1 << 5,
         PSSCAN_CMD      = 1 << 6,
-        PSSCAN_STATE    = 1 << 7,
-        PSSCAN_VSZ      = 1 << 8,
-        PSSCAN_RSS      = 1 << 9,
-        PSSCAN_STIME    = 1 << 10,
-        PSSCAN_UTIME    = 1 << 11,
-        PSSCAN_TTY      = 1 << 12,
-        USE_SELINUX(PSSCAN_CONTEXT  = 1 << 13,)
+        PSSCAN_ARGV0    = 1 << 7,
+        PSSCAN_EXE      = 1 << 8, /* not implemented yet */
+        PSSCAN_STATE    = 1 << 9,
+        PSSCAN_VSZ      = 1 << 10,
+        PSSCAN_RSS      = 1 << 11,
+        PSSCAN_STIME    = 1 << 12,
+        PSSCAN_UTIME    = 1 << 13,
+        PSSCAN_TTY      = 1 << 14,
+        USE_SELINUX(PSSCAN_CONTEXT  = 1 << 15,)
         /* These are all retrieved from proc/NN/stat in one go: */
         PSSCAN_STAT     = PSSCAN_PPID | PSSCAN_PGID | PSSCAN_SID
                         | PSSCAN_COMM | PSSCAN_STATE