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/* Jim - POSIX extension
* Copyright 2005 Salvatore Sanfilippo <antirez@invece.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
*
* A copy of the license is also included in the source distribution
* of Jim, as a TXT file name called LICENSE.
*
* 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 <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include "jim.h"
#ifdef HAVE_SYSINFO
#include <sys/sysinfo.h>
#endif
static void Jim_PosixSetError(Jim_Interp *interp)
{
Jim_SetResultString(interp, strerror(errno), -1);
}
#if defined(HAVE_FORK) && !defined(HAVE_NO_FORK)
static int Jim_PosixForkCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
pid_t pid;
JIM_NOTUSED(argv);
if (argc != 1) {
Jim_WrongNumArgs(interp, 1, argv, "");
return JIM_ERR;
}
if ((pid = fork()) == -1) {
Jim_PosixSetError(interp);
return JIM_ERR;
}
Jim_SetResultInt(interp, (jim_wide) pid);
return JIM_OK;
}
#endif
/*
* os.wait ?-nohang? pid
*
* An interface to waitpid(2)
*
* Returns a 3 element list.
*
* If -nohang is specified, and the process is still alive, returns
*
* {0 none 0}
*
* If the process does not exist or has already been waited for, returns:
*
* {-1 error <error-description>}
*
* If the process exited normally, returns:
*
* {<pid> exit <exit-status>}
*
* If the process terminated on a signal, returns:
*
* {<pid> signal <signal-number>}
*
* Otherwise (core dump, stopped, continued, ...), returns:
*
* {<pid> other 0}
*/
static int Jim_PosixWaitCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
int nohang = 0;
long pid;
int status;
Jim_Obj *listObj;
const char *type;
int value;
if (argc > 1 && Jim_CompareStringImmediate(interp, argv[1], "-nohang")) {
nohang = 1;
}
if (argc != nohang + 2) {
Jim_WrongNumArgs(interp, 1, argv, "?-nohang? pid");
return JIM_ERR;
}
if (Jim_GetLong(interp, argv[nohang + 1], &pid) != JIM_OK) {
return JIM_ERR;
}
pid = waitpid(pid, &status, nohang ? WNOHANG : 0);
listObj = Jim_NewListObj(interp, NULL, 0);
Jim_ListAppendElement(interp, listObj, Jim_NewIntObj(interp, pid));
if (pid < 0) {
type = "error";
value = errno;
}
else if (pid == 0) {
type = "none";
value = 0;
}
else if (WIFEXITED(status)) {
type = "exit";
value = WEXITSTATUS(status);
}
else if (WIFSIGNALED(status)) {
type = "signal";
value = WTERMSIG(status);
}
else {
type = "other";
value = 0;
}
Jim_ListAppendElement(interp, listObj, Jim_NewStringObj(interp, type, -1));
if (pid < 0) {
Jim_ListAppendElement(interp, listObj, Jim_NewStringObj(interp, strerror(value), -1));
}
else {
Jim_ListAppendElement(interp, listObj, Jim_NewIntObj(interp, value));
}
Jim_SetResult(interp, listObj);
return JIM_OK;
}
static int Jim_PosixGetidsCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
Jim_Obj *objv[8];
if (argc != 1) {
Jim_WrongNumArgs(interp, 1, argv, "");
return JIM_ERR;
}
objv[0] = Jim_NewStringObj(interp, "uid", -1);
objv[1] = Jim_NewIntObj(interp, getuid());
objv[2] = Jim_NewStringObj(interp, "euid", -1);
objv[3] = Jim_NewIntObj(interp, geteuid());
objv[4] = Jim_NewStringObj(interp, "gid", -1);
objv[5] = Jim_NewIntObj(interp, getgid());
objv[6] = Jim_NewStringObj(interp, "egid", -1);
objv[7] = Jim_NewIntObj(interp, getegid());
Jim_SetResult(interp, Jim_NewListObj(interp, objv, 8));
return JIM_OK;
}
#define JIM_HOST_NAME_MAX 1024
static int Jim_PosixGethostnameCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
char *buf;
int rc = JIM_OK;
if (argc != 1) {
Jim_WrongNumArgs(interp, 1, argv, "");
return JIM_ERR;
}
buf = Jim_Alloc(JIM_HOST_NAME_MAX);
if (gethostname(buf, JIM_HOST_NAME_MAX) == -1) {
Jim_PosixSetError(interp);
rc = JIM_ERR;
}
else {
Jim_SetResult(interp, Jim_NewStringObjNoAlloc(interp, buf, -1));
}
return rc;
}
static int Jim_PosixUptimeCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
#ifdef HAVE_SYSINFO
struct sysinfo info;
if (argc != 1) {
Jim_WrongNumArgs(interp, 1, argv, "");
return JIM_ERR;
}
if (sysinfo(&info) == -1) {
Jim_PosixSetError(interp);
return JIM_ERR;
}
Jim_SetResultInt(interp, info.uptime);
#else
Jim_SetResultInt(interp, (long)time(NULL));
#endif
return JIM_OK;
}
static int Jim_PosixPidCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
if (argc != 1) {
Jim_WrongNumArgs(interp, 1, argv, "");
return JIM_ERR;
}
Jim_SetResultInt(interp, getpid());
return JIM_OK;
}
int Jim_posixInit(Jim_Interp *interp)
{
#ifdef HAVE_FORK
Jim_CreateCommand(interp, "os.fork", Jim_PosixForkCommand, NULL, NULL);
#endif
Jim_CreateCommand(interp, "os.wait", Jim_PosixWaitCommand, NULL, NULL);
Jim_CreateCommand(interp, "os.getids", Jim_PosixGetidsCommand, NULL, NULL);
Jim_CreateCommand(interp, "os.gethostname", Jim_PosixGethostnameCommand, NULL, NULL);
Jim_CreateCommand(interp, "os.uptime", Jim_PosixUptimeCommand, NULL, NULL);
Jim_CreateCommand(interp, "pid", Jim_PosixPidCommand, NULL, NULL);
return JIM_OK;
}
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