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/*
* nixio - Linux I/O library for lua
*
* Copyright (C) 2009 Steven Barth <steven@midlink.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#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>
#include <signal.h>
static int nixio_fork(lua_State *L) {
pid_t pid = fork();
if (pid == -1) {
return nixio__perror(L);
} else {
lua_pushinteger(L, pid);
return 1;
}
}
static int nixio_signal(lua_State *L) {
int sig = luaL_checkinteger(L, 1);
const char *val = luaL_checkstring(L, 2);
if (!strcmp(val, "ign") || !strcmp(val, "ignore")) {
return nixio__pstatus(L, signal(sig, SIG_IGN) != SIG_ERR);
} else if (!strcmp(val, "dfl") || !strcmp(val, "default")) {
return nixio__pstatus(L, signal(sig, SIG_DFL) != SIG_ERR);
} else {
return luaL_argerror(L, 2, "supported values: ign, dfl");
}
}
static int nixio_wait(lua_State *L) {
pid_t pidin = luaL_optinteger(L, 1, -1), pidout;
int options = 0, status;
const int j = lua_gettop(L);
for (int i=2; i<=j; i++) {
const char *flag = luaL_checkstring(L, i);
if (!strcmp(flag, "nohang")) {
options |= WNOHANG;
} else if (!strcmp(flag, "untraced")) {
options |= WUNTRACED;
} else if (!strcmp(flag, "continued")) {
options |= WCONTINUED;
} else {
return luaL_argerror(L, i,
"supported values: nohang, untraced, continued");
}
}
do {
pidout = waitpid(pidin, &status, options);
} while (pidout == -1 && errno == EINTR);
if (pidout == 0) {
lua_pushboolean(L, 0);
return 1;
} else if (pidout == -1) {
return nixio__perror(L);
} else {
lua_pushinteger(L, pidout);
}
if (WIFEXITED(status)) {
lua_pushliteral(L, "exited");
lua_pushinteger(L, WEXITSTATUS(status));
} else if (WIFSIGNALED(status)) {
lua_pushliteral(L, "signaled");
lua_pushinteger(L, WTERMSIG(status));
} else if (WIFSTOPPED(status)) {
lua_pushliteral(L, "stopped");
lua_pushinteger(L, WSTOPSIG(status));
} else {
return 1;
}
return 3;
}
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));
}
static int nixio_nice(lua_State *L) {
int nval = luaL_checkint(L, 1);
errno = 0;
nval = nice(nval);
if (nval == -1 && errno) {
return nixio__perror(L);
} else {
lua_pushinteger(L, nval);
return 1;
}
}
static int nixio_setsid(lua_State *L) {
pid_t pid = setsid();
if (pid == -1) {
return nixio__perror(L);
} else {
lua_pushinteger(L, pid);
return 1;
}
}
/* module table */
static const luaL_reg R[] = {
{"fork", nixio_fork},
{"wait", nixio_wait},
{"kill", nixio_kill},
{"nice", nixio_nice},
{"getpid", nixio_getpid},
{"getppid", nixio_getppid},
{"getuid", nixio_getuid},
{"getgid", nixio_getgid},
{"setuid", nixio_setuid},
{"setgid", nixio_setgid},
{"setsid", nixio_setsid},
{"signal", nixio_signal},
{NULL, NULL}
};
void nixio_open_process(lua_State *L) {
luaL_register(L, NULL, R);
}
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