From 298338c1112460148a29a6402551027854ace1a9 Mon Sep 17 00:00:00 2001
From: Tamas TEVESZ <ice@extreme.hu>
Date: Tue, 23 Mar 2010 02:13:27 +0100
Subject: [PATCH] GetCommandForPid() for darwin/osx

---
 src/osdep/darwin.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/osdep/darwin.c

diff --git a/src/osdep/darwin.c b/src/osdep/darwin.c
new file mode 100644
index 00000000..e037b5df
--- /dev/null
+++ b/src/osdep/darwin.c
@@ -0,0 +1,92 @@
+
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * copy argc and argv for an existing process identified by `pid'
+ * into suitable storage given in ***argv and *argc.
+ *
+ * subsequent calls use the same static area for argv and argc.
+ *
+ * returns 0 for failure, in which case argc := 0 and argv := NULL
+ * returns 1 for success
+ */
+Bool GetCommandForPid(int pid, char ***argv, int *argc)
+#ifdef KERN_PROCARGS2
+{
+	int j, mib[4];
+	unsigned int i, idx;
+	size_t count;
+	static char *args = NULL;
+	static int argmax = 0;
+
+	*argv = NULL;
+	*argc = 0;
+
+	/* the system-wide limit */
+	if (argmax == 0) { /* it hopefully doesn't change at runtime *g* */
+		mib[0] = CTL_KERN;
+		mib[1] = KERN_ARGMAX;
+		mib[2] = 0;
+		mib[3] = 0;
+
+		count = sizeof(argmax);
+		if (sysctl(mib, 2, &argmax, &count, NULL, 0) == -1)
+			return False;
+	}
+
+	/* if argmax is still 0, something went very seriously wrong */
+	assert(argmax > 0);
+
+	/* space for args; no need to free before returning even on errors */
+	if (args == NULL)
+		args = (char *)wmalloc(argmax);
+
+	/* get process args */
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_PROCARGS2;
+	mib[2] = pid;
+
+	count = argmax;
+	if (sysctl(mib, 3, args, &count, NULL, 0) == -1 || count == 0)
+		return False;
+
+	/* get argc, skip */
+	memcpy(argc, args, sizeof(*argc));
+	idx = sizeof(*argc);
+
+	while (args[idx++] != '\0')		/* skip execname */
+		;
+	while (args[idx] == '\0')		/* padding too */
+		idx++;
+	/* args[idx] is at at begininng of args now */
+
+	*argv = (char **)wmalloc(sizeof(char *) * (*argc + 1 /* term. null ptr */));
+	(*argv)[0] = args + idx;
+
+	/* go through args, set argv[$next] to the beginning of each string */
+	for (i = 0, j = 1; i < count - idx /* do not overrun */; i++) {
+		if (args[idx + i] != '\0')
+			continue;
+		if (args[idx + i] == '\0')
+			(*argv)[j++] = &args[idx + i + 1];
+		if (j == *argc)
+			break;
+	}
+
+	/* the list of arguments must be terminated by a null pointer */
+	(*argv)[j] = NULL;
+	return True;
+}
+#else /* !KERN_PROCARGS2 */
+{
+	*argv = NULL;
+	*argc = 0;
+
+	return False;
+}
+#endif