1 files changed, 73 insertions, 0 deletions
diff --git a/lib/libutil/kinfo_getfile.c b/lib/libutil/kinfo_getfile.c
new file mode 100644
index 0000000..84b64db
--- /dev/null
+++ b/lib/libutil/kinfo_getfile.c
@@ -0,0 +1,73 @@
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/user.h>
+#include <sys/sysctl.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libutil.h"
+
+struct kinfo_file *
+kinfo_getfile(pid_t pid, int *cntp)
+{
+	int mib[4];
+	int error;
+	int cnt;
+	size_t len;
+	char *buf, *bp, *eb;
+	struct kinfo_file *kif, *kp, *kf;
+
+	*cntp = 0;
+	len = 0;
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_PROC;
+	mib[2] = KERN_PROC_FILEDESC;
+	mib[3] = pid;
+
+	error = sysctl(mib, 4, NULL, &len, NULL, 0);
+	if (error)
+		return (NULL);
+	len = len * 4 / 3;
+	buf = malloc(len);
+	if (buf == NULL)
+		return (NULL);
+	error = sysctl(mib, 4, buf, &len, NULL, 0);
+	if (error) {
+		free(buf);
+		return (NULL);
+	}
+	/* Pass 1: count items */
+	cnt = 0;
+	bp = buf;
+	eb = buf + len;
+	while (bp < eb) {
+		kf = (struct kinfo_file *)(uintptr_t)bp;
+		bp += kf->kf_structsize;
+		cnt++;
+	}
+
+	kif = calloc(cnt, sizeof(*kif));
+	if (kif == NULL) {
+		free(buf);
+		return (NULL);
+	}
+	bp = buf;
+	eb = buf + len;
+	kp = kif;
+	/* Pass 2: unpack */
+	while (bp < eb) {
+		kf = (struct kinfo_file *)(uintptr_t)bp;
+		/* Copy/expand into pre-zeroed buffer */
+		memcpy(kp, kf, kf->kf_structsize);
+		/* Advance to next packed record */
+		bp += kf->kf_structsize;
+		/* Set field size to fixed length, advance */
+		kp->kf_structsize = sizeof(*kp);
+		kp++;
+	}
+	free(buf);
+	*cntp = cnt;
+	return (kif);	/* Caller must free() return value */
+}