From 7d64dae54bde70744a9154b8ac1cbb09d03881c9 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Tue, 3 Sep 2013 18:43:32 -0500
Subject: [PATCH] Replace
 for_each_pid_with_name_in_array_perform_callback_function_upon_translated_value()
 with name_to_pid(), comparing absolute paths or just basename() consistently
 as spotted by Lukasz Skalski, and adjust callers.

---
 lib/pending.c      | 25 ++++++++++---------------
 toys/lsb/killall.c | 15 +++++++--------
 toys/lsb/pidof.c   |  4 ++--
 3 files changed, 19 insertions(+), 25 deletions(-)

diff --git a/lib/pending.c b/lib/pending.c
index 9e250854..a06912ee 100644
--- a/lib/pending.c
+++ b/lib/pending.c
@@ -6,33 +6,28 @@
 #include "toys.h"
 
 // Execute a callback for each PID that matches a process name from a list.
-void for_each_pid_with_name_in(char **names, int (*callback)(pid_t pid, char *name))
+void name_to_pid(char **names, int (*callback)(pid_t pid, char *name))
 {
   DIR *dp;
   struct dirent *entry;
-  char cmd[sizeof(toybuf)], path[64];
-  char **curname;
 
   if (!(dp = opendir("/proc"))) perror_exit("opendir");
 
   while ((entry = readdir(dp))) {
     int fd, n;
+    unsigned u;
+    char *cmd, **curname;
 
-    if (!isdigit(*entry->d_name)) continue;
-
-    if (sizeof(path) <= snprintf(path, sizeof(path), "/proc/%s/cmdline",
-      entry->d_name)) continue;
-
-    if (-1 == (fd=open(path, O_RDONLY))) continue;
-    n = read(fd, cmd, sizeof(cmd));
-    close(fd);
-    if (n<1) continue;
+    if (!(u = atoi(entry->d_name))) continue;
+    sprintf(libbuf, "/proc/%u/cmdline", u);
+    if (!(cmd = readfile(libbuf, libbuf, sizeof(libbuf)))) continue;
 
     for (curname = names; *curname; curname++)
-      if (!strcmp(basename(cmd), *curname)) 
-          if (!callback(atol(entry->d_name), *curname)) goto done;
+      if (*curname == '/' ? !strcmp(cmd, *curname)
+          : !strcmp(basename(cmd), basename(*curname))
+        if (!callback(u, *curname)) break;
+    if (*curname) break;
   }
-done:
   closedir(dp);
 }
 
diff --git a/toys/lsb/killall.c b/toys/lsb/killall.c
index fe433282..59151d8b 100644
--- a/toys/lsb/killall.c
+++ b/toys/lsb/killall.c
@@ -32,21 +32,20 @@ static int kill_process(pid_t pid, char *name)
 {
   int ret;
 
-  if (pid == TT.cur_pid) return 1;
+  if (pid == TT.cur_pid) return 0;
 
   if (toys.optflags & FLAG_i) {
     sprintf(toybuf, "Signal %s(%d) ?", name, pid);
-    if (yesno(toybuf, 0) == 0) return 1;
+    if (yesno(toybuf, 0) == 0) return 0;
   }
 
-  toys.exitval = 0;
-
   ret = kill(pid, TT.signum);
-  if (toys.optflags & FLAG_v)
+  if (ret == -1 && !(toys.optflags & FLAG_q))
+    error_msg("bad %u", (unsigned)pid);
+  else if (toys.optflags & FLAG_v)
     printf("Killed %s(%d) with signal %d\n", name, pid, TT.signum);
 
-  if (ret == -1 && !(toys.optflags & FLAG_q)) perror("kill");
-  return 1;
+  return 0;
 }
 
 void killall_main(void)
@@ -76,7 +75,7 @@ void killall_main(void)
 
   TT.cur_pid = getpid();
 
-  for_each_pid_with_name_in(names, kill_process);
+  names_to_pid(names, kill_process);
 
   if (toys.exitval && !(toys.optflags & FLAG_q)) error_exit("No such process");
 }
diff --git a/toys/lsb/pidof.c b/toys/lsb/pidof.c
index 7285b6ae..70582a51 100644
--- a/toys/lsb/pidof.c
+++ b/toys/lsb/pidof.c
@@ -43,12 +43,12 @@ static int print_pid(pid_t pid, char * name)
   xprintf("%*s", len+(!toys.exitval), toybuf);
   toys.exitval = 0;
 
-  return !(toys.optflags & FLAG_s);
+  return toys.optflags & FLAG_s;
 }
 
 void pidof_main(void)
 {
   toys.exitval = 1;
-  for_each_pid_with_name_in(toys.optargs, print_pid);
+  name_to_pid(toys.optargs, print_pid);
   if (!toys.exitval) xputc('\n');
 }
-- 
2.11.0