From 36b7cb7c3b856b1b17db4b9df44161e40f09e237 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Mon, 18 Jan 2016 15:45:56 -0600
Subject: Implement basic pkill plumbing, and fix FORCE_FLAGS on flag context
 switch.

---
 scripts/mkflags.c |  5 +++--
 toys/posix/ps.c   | 42 +++++++++++++++++++++++++++++++++++++-----
 2 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/scripts/mkflags.c b/scripts/mkflags.c
index e7ed684a..da3b2f9b 100644
--- a/scripts/mkflags.c
+++ b/scripts/mkflags.c
@@ -116,8 +116,9 @@ int main(int argc, char *argv[])
   // See "intentionally crappy", above.
   if (!(out = outbuf)) return 1;
 
-  printf("#ifdef FORCE_FLAGS\n#define FORCED_FLAG 1\n#define FORCED_FLAGLL 1LL\n"
-         "#else\n#define FORCED_FLAG 0\n#define FORCED_FLAGLL 0\n#endif\n\n");
+  printf("#undef FORCED_FLAG\n#undef FORCED_FLAGLL\n"
+    "#ifdef FORCE_FLAGS\n#define FORCED_FLAG 1\n#define FORCED_FLAGLL 1LL\n"
+    "#else\n#define FORCED_FLAG 0\n#define FORCED_FLAGLL 0\n#endif\n\n");
 
   for (;;) {
     struct flag *flist, *aflist, *offlist;
diff --git a/toys/posix/ps.c b/toys/posix/ps.c
index a7ba5b37..625f4377 100644
--- a/toys/posix/ps.c
+++ b/toys/posix/ps.c
@@ -40,7 +40,7 @@ USE_PS(NEWTOY(ps, "k(sort)*P(ppid)*aAdeflno*p(pid)*s*t*u*U*g*G*wZ[!ol][+Ae]", TO
 USE_TTOP(NEWTOY(ttop, ">0d#=3n#<1mb", TOYFLAG_USR|TOYFLAG_BIN))
 USE_IOTOP(NEWTOY(iotop, "Aabkoqp*u*d#n#", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_STAYROOT|TOYFLAG_LOCALE))
 USE_PGREP(NEWTOY(pgrep, "?cld:u*U*t*s*P*g*G*fnovxL:", TOYFLAG_USR|TOYFLAG_BIN))
-USE_PKILL(NEWTOY(pkill,      "u*U*t*s*P*g*G*fnovxl:", TOYFLAG_USR|TOYFLAG_BIN))
+USE_PKILL(NEWTOY(pkill,     "Vu*U*t*s*P*g*G*fnovxl:", TOYFLAG_USR|TOYFLAG_BIN))
 
 config PS
   bool "ps"
@@ -206,11 +206,12 @@ config PGKILL_COMMON
 
 config PKILL
   bool "pkill"
-  default n
+  default y
   help
     usage: pkill [-l SIGNAL] [PATTERN]
 
     -l	SIGNAL to send
+    -V	verbose
 */
 
 #define FOR_ps
@@ -253,6 +254,7 @@ GLOBALS(
 
       void *regexes;
       int signal;
+      pid_t self;
     } pgrep;
   };
 
@@ -1256,6 +1258,10 @@ void iotop_main(void)
   if (!(toys.optflags&FLAG_b)) tty_reset();
 }
 
+// pkill's plumbing wrap's pgrep's and thus mostly takes place in pgrep's flag
+// context, so force pgrep's flags on even when building pkill standalone.
+// (All the pgrep/pkill functions drop out when building ps standalone.)
+#define FORCE_FLAGS
 #define CLEANUP_iotop
 #define FOR_pgrep
 #include "generated/flags.h"
@@ -1271,6 +1277,9 @@ static void show_pgrep(struct carveup *tb)
   struct regex_list *reg;
   char *name = tb->str;
 
+  // Never match ourselves.
+  if (TT.pgrep.self == *tb->slot) return;
+
   if (toys.optflags&FLAG_f) name += tb->offset[4];
 
   if (TT.pgrep.regexes) {
@@ -1283,7 +1292,17 @@ static void show_pgrep(struct carveup *tb)
     if (!reg) return;
   }
 
-  printf("%lld%s", *tb->slot, TT.pgrep.d ? TT.pgrep.d : "\n");
+  if (TT.pgrep.signal) {
+    if (kill(*tb->slot, TT.pgrep.signal)) {
+      char *s = num_to_sig(TT.pgrep.signal);
+
+      if (!s) sprintf(s = toybuf, "%d", TT.pgrep.signal);
+      
+      perror_msg("%s->%lld", s, *tb->slot);
+    }
+  }
+  if (!TT.pgrep.signal || TT.tty)
+    printf("%lld%s", *tb->slot, TT.pgrep.d ? TT.pgrep.d : "\n");
 }
 
 void pgrep_main(void)
@@ -1291,6 +1310,12 @@ void pgrep_main(void)
   char **arg;
   struct regex_list *reg;
 
+  TT.pgrep.self = getpid();
+
+  // No signal names start with "L", so no need for "L: " parsing.
+  if (TT.pgrep.L && 1>(TT.pgrep.signal = sig_to_num(TT.pgrep.L)))
+    error_exit("bad -L '%s'", TT.pgrep.L);
+
   comma_args(TT.pgrep.G, &TT.GG, "bad -G", parse_rest);
   comma_args(TT.pgrep.g, &TT.gg, "bad -g", parse_rest);
   comma_args(TT.pgrep.P, &TT.PP, "bad -P", parse_rest);
@@ -1303,8 +1328,10 @@ void pgrep_main(void)
       !(toys.optflags&(FLAG_G|FLAG_g|FLAG_P|FLAG_s|FLAG_t|FLAG_U|FLAG_u)))
     if (!toys.optc) help_exit("No PATTERN");
 
-  if (toys.optflags&FLAG_f) TT.bits |= _PS_CMDLINE;
-
+printf("f=%llx in %llx\n", (long long)FLAG_v, (long long)toys.optflags);
+  if (toys.optflags&FLAG_f) {TT.bits |= _PS_CMDLINE;
+printf("got f\n");
+}
   for (arg = toys.optargs; *arg; arg++) {
     reg = xmalloc(sizeof(struct regex_list));
     xregcomp(&reg->reg, *arg, REG_EXTENDED);
@@ -1318,8 +1345,13 @@ void pgrep_main(void)
   if (TT.pgrep.d) xputc('\n');
 }
 
+#define CLEANUP_pgrep
+#define FOR_pkill
+#include "generated/flags.h"
+
 void pkill_main(void)
 {
   if (!TT.pgrep.L) TT.pgrep.signal = SIGTERM;
+  if (toys.optflags & FLAG_V) TT.tty = 1;
   pgrep_main();
 }
-- 
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