From 0912f6890925a9e9aa552fb841f9162ea6bd3d70 Mon Sep 17 00:00:00 2001
From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
Date: Tue, 4 Oct 2016 05:27:04 -0500
Subject: Add some new interfaces

---
 backtrace.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 dlmopen.c   | 15 +++++++++++++++
 gnulib.c    |  8 ++++++++
 pthread.c   | 31 +++++++++++++++++++++++++++++++
 setjmp.c    |  7 +++++++
 5 files changed, 105 insertions(+)
 create mode 100644 backtrace.c
 create mode 100644 dlmopen.c
 create mode 100644 gnulib.c
 create mode 100644 pthread.c
 create mode 100644 setjmp.c

diff --git a/backtrace.c b/backtrace.c
new file mode 100644
index 0000000..2ceb334
--- /dev/null
+++ b/backtrace.c
@@ -0,0 +1,44 @@
+#include <dlfcn.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+#define _frame_level(addr_buf, curr, frame, size) \
+	if(__builtin_frame_address(frame) != NULL && (curr = __builtin_return_address(frame)) > 0x1000 && frame <= size) addr_buf[frame] = curr; \
+	else return size;
+
+int backtrace(void **addr_buf, int size)
+{
+	void *curr;
+	_frame_level(addr_buf, curr, 0, size)
+	_frame_level(addr_buf, curr, 1, size)
+	_frame_level(addr_buf, curr, 2, size)
+	_frame_level(addr_buf, curr, 3, size)
+	_frame_level(addr_buf, curr, 4, size)
+	_frame_level(addr_buf, curr, 5, size)
+	_frame_level(addr_buf, curr, 6, size)
+	_frame_level(addr_buf, curr, 7, size)
+	_frame_level(addr_buf, curr, 8, size)
+	_frame_level(addr_buf, curr, 9, size)
+	return 9;
+}
+
+char **backtrace_symbols(void * const *addr_buf, int size)
+{
+	char **result = calloc(sizeof(char *), size);
+	if(result == NULL) return result;
+
+	for(int next = 0; next < size; next++)
+	{
+		Dl_info info;
+		int err = dladdr(addr_buf[next], &info);
+
+		if(err != 0)
+		{
+			result[next] = "??:0";
+		} else {
+			result[next] = info.dli_sname;
+		}
+	}
+
+	return result;
+}
diff --git a/dlmopen.c b/dlmopen.c
new file mode 100644
index 0000000..fecb29c
--- /dev/null
+++ b/dlmopen.c
@@ -0,0 +1,15 @@
+#include <dlfcn.h>      // dlopen
+#include <stdio.h>      // fprintf
+#include <stdlib.h>     // getenv
+
+void *dlmopen(long lmid, const char *pathname, int mode)
+{
+	if(getenv("GLIBC_FAKE_DEBUG"))
+	{
+		fprintf(stderr, "library %s was requested to load in %ld namespace",
+			pathname, lmid);
+	}
+
+	return dlopen(pathname, mode);
+}
+
diff --git a/gnulib.c b/gnulib.c
new file mode 100644
index 0000000..08544fc
--- /dev/null
+++ b/gnulib.c
@@ -0,0 +1,8 @@
+#include <assert.h>
+#include <sys/select.h>
+
+unsigned long __fdelt_chk(unsigned long size)
+{
+	assert(size < FD_SETSIZE);
+	return size / (sizeof(unsigned long)<<3);
+}
diff --git a/pthread.c b/pthread.c
new file mode 100644
index 0000000..b4ea054
--- /dev/null
+++ b/pthread.c
@@ -0,0 +1,31 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+/* "Now we are all sons of bitches." */
+int pthread_setname_np(pthread_t thread, const char *name)
+{
+	char path[PATH_MAX];
+	int fd;
+	/* Cthulhu have mercy */
+	pid_t *my_pid = (pid_t *)((void *)thread + (sizeof(uintptr_t) * 7));
+	size_t len = strlen(name);
+
+	if(len > 15)
+	{
+		return -ERANGE;
+	}
+
+	snprintf(path, PATH_MAX, "/proc/self/tid/%u/name", *my_pid);
+	fd = open(path, O_RDWR);
+	write(fd, name, len + 1);
+	close(fd);
+
+	return 0;
+}
diff --git a/setjmp.c b/setjmp.c
new file mode 100644
index 0000000..306868f
--- /dev/null
+++ b/setjmp.c
@@ -0,0 +1,7 @@
+#include <assert.h>
+#include <setjmp.h>
+
+void __longjmp_chk(jmp_buf env, int val)
+{
+	longjmp(env, val);
+}
-- 
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