From f151bb804f558f5132a5b39feb38116ea2e95b21 Mon Sep 17 00:00:00 2001
From: Steven Barth <steven@midlink.org>
Date: Thu, 5 Mar 2009 19:20:40 +0000
Subject: [PATCH] nixio: Export more constants, introduce {g,s}et{g,u}id,
 getpid, getppid

---
 libs/nixio/src/nixio.c   |  7 +++++-
 libs/nixio/src/process.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/libs/nixio/src/nixio.c b/libs/nixio/src/nixio.c
index e44f5fd47..d433ba4fd 100644
--- a/libs/nixio/src/nixio.c
+++ b/libs/nixio/src/nixio.c
@@ -130,9 +130,10 @@ LUALIB_API int luaopen_nixio(lua_State *L) {
 	lua_setfield(L, -2, "version");
 
 	/* some constants */
-	lua_createtable(L, 0, 11);
+	lua_createtable(L, 0, 16);
 
 	NIXIO_PUSH_CONSTANT(EACCES);
+	NIXIO_PUSH_CONSTANT(EINTR);
 	NIXIO_PUSH_CONSTANT(ENOSYS);
 	NIXIO_PUSH_CONSTANT(EINVAL);
 	NIXIO_PUSH_CONSTANT(EWOULDBLOCK);
@@ -143,6 +144,10 @@ LUALIB_API int luaopen_nixio(lua_State *L) {
 	NIXIO_PUSH_CONSTANT(SIGINT);
 	NIXIO_PUSH_CONSTANT(SIGTERM);
 	NIXIO_PUSH_CONSTANT(SIGKILL);
+	NIXIO_PUSH_CONSTANT(SIGHUP);
+	NIXIO_PUSH_CONSTANT(SIGSTOP);
+	NIXIO_PUSH_CONSTANT(SIGCONT);
+	NIXIO_PUSH_CONSTANT(SIGSEGV);
 
 	lua_setfield(L, -2, "const");
 
diff --git a/libs/nixio/src/process.c b/libs/nixio/src/process.c
index 1f2ae153f..19fa10ef2 100644
--- a/libs/nixio/src/process.c
+++ b/libs/nixio/src/process.c
@@ -17,10 +17,13 @@
  */
 
 #include "nixio.h"
+#include <pwd.h>
+#include <grp.h>
 #include <unistd.h>
 #include <errno.h>
 #include <string.h>
 #include <sys/wait.h>
+#include <sys/types.h>
 
 static int nixio_fork(lua_State *L) {
 	pid_t pid = fork();
@@ -81,12 +84,66 @@ static int nixio_kill(lua_State *L) {
 	return nixio__pstatus(L, !kill(luaL_checkint(L, 1), luaL_checkint(L, 2)));
 }
 
+static int nixio_getpid(lua_State *L) {
+	lua_pushinteger(L, getpid());
+	return 1;
+}
+
+static int nixio_getppid(lua_State *L) {
+	lua_pushinteger(L, getppid());
+	return 1;
+}
+
+static int nixio_getuid(lua_State *L) {
+	lua_pushinteger(L, getuid());
+	return 1;
+}
+
+static int nixio_getgid(lua_State *L) {
+	lua_pushinteger(L, getgid());
+	return 1;
+}
+
+static int nixio_setgid(lua_State *L) {
+	gid_t gid;
+	if (lua_isstring(L, 1)) {
+		struct group *g = getgrnam(lua_tostring(L, 1));
+		gid = (!g) ? -1 : g->gr_gid;
+	} else if (lua_isnumber(L, 1)) {
+		gid = lua_tointeger(L, 1);
+	} else {
+		return luaL_argerror(L, 1, "supported values: <groupname>, <gid>");
+	}
+
+	return nixio__pstatus(L, !setgid(gid));
+}
+
+static int nixio_setuid(lua_State *L) {
+	uid_t uid;
+	if (lua_isstring(L, 1)) {
+		struct passwd *p = getpwnam(lua_tostring(L, 1));
+		uid = (!p) ? -1 : p->pw_uid;
+	} else if (lua_isnumber(L, 1)) {
+		uid = lua_tointeger(L, 1);
+	} else {
+		return luaL_argerror(L, 1, "supported values: <username>, <uid>");
+	}
+
+	return nixio__pstatus(L, !setuid(uid));
+}
+
 
 /* module table */
 static const luaL_reg R[] = {
 	{"fork",		nixio_fork},
 	{"wait",		nixio_wait},
 	{"kill",		nixio_kill},
+	{"getpid",		nixio_getpid},
+	{"getppid",		nixio_getppid},
+	{"getuid",		nixio_getuid},
+	{"getgid",		nixio_getgid},
+	{"setuid",		nixio_setuid},
+	{"setgid",		nixio_setgid},
 	{NULL,			NULL}
 };
 
-- 
2.11.0