jim-posix.c

   1
   2 /* Jim - POSIX extension
   3  * Copyright 2005 Salvatore Sanfilippo <antirez@invece.org>
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * A copy of the license is also included in the source distribution
  12  * of Jim, as a TXT file name called LICENSE.
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20
  21 #include <sys/types.h>
  22 #include <sys/time.h>
  23 #include <sys/wait.h>
  24 #include <unistd.h>
  25 #include <string.h>
  26 #include <signal.h>
  27 #include <errno.h>
  28
  29 #include "jim.h"
  30
  31 #ifdef HAVE_SYSINFO
  32 #include <sys/sysinfo.h>
  33 #endif
  34
  35 static void Jim_PosixSetError(Jim_Interp *interp)
  36 {
  37     Jim_SetResultString(interp, strerror(errno), -1);
  38 }
  39
  40 #ifdef HAVE_FORK
  41 static int Jim_PosixForkCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
  42 {
  43     pid_t pid;
  44
  45     JIM_NOTUSED(argv);
  46
  47     if (argc != 1) {
  48         Jim_WrongNumArgs(interp, 1, argv, "");
  49         return JIM_ERR;
  50     }
  51     if ((pid = fork()) == -1) {
  52         Jim_PosixSetError(interp);
  53         return JIM_ERR;
  54     }
  55     Jim_SetResultInt(interp, (jim_wide) pid);
  56     return JIM_OK;
  57 }
  58 #endif
  59
  60 /*
  61  * os.wait ?-nohang? pid
  62  *
  63  * An interface to waitpid(2)
  64  *
  65  * Returns a 3 element list.
  66  *
  67  * If -nohang is specified, and the process is still alive, returns
  68  *
  69  *   {0 none 0}
  70  *
  71  * If the process does not exist or has already been waited for, returns:
  72  *
  73  *   {-1 error <error-description>}
  74  *
  75  * If the process exited normally, returns:
  76  *
  77  *   {<pid> exit <exit-status>}
  78  *
  79  * If the process terminated on a signal, returns:
  80  *
  81  *   {<pid> signal <signal-number>}
  82  *
  83  * Otherwise (core dump, stopped, continued, ...), returns:
  84  *
  85  *   {<pid> other 0}
  86  */
  87 static int Jim_PosixWaitCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
  88 {
  89     int nohang = 0;
  90     long pid;
  91     int status;
  92     Jim_Obj *listObj;
  93     const char *type;
  94     int value;
  95
  96     if (argc > 1 && Jim_CompareStringImmediate(interp, argv[1], "-nohang")) {
  97         nohang = 1;
  98     }
  99     if (argc != nohang + 2) {
 100         Jim_WrongNumArgs(interp, 1, argv, "?-nohang? pid");
 101         return JIM_ERR;
 102     }
 103     if (Jim_GetLong(interp, argv[nohang + 1], &pid) != JIM_OK) {
 104         return JIM_ERR;
 105     }
 106
 107     pid = waitpid(pid, &status, nohang ? WNOHANG : 0);
 108     listObj = Jim_NewListObj(interp, NULL, 0);
 109     Jim_ListAppendElement(interp, listObj, Jim_NewIntObj(interp, pid));
 110     if (pid < 0) {
 111         type = "error";
 112         value = errno;
 113     }
 114     else if (pid == 0) {
 115         type = "none";
 116         value = 0;
 117     }
 118     else if (WIFEXITED(status)) {
 119         type = "exit";
 120         value = WEXITSTATUS(status);
 121     }
 122     else if (WIFSIGNALED(status)) {
 123         type = "signal";
 124         value = WTERMSIG(status);
 125     }
 126     else {
 127         type = "other";
 128         value = 0;
 129     }
 130
 131     Jim_ListAppendElement(interp, listObj, Jim_NewStringObj(interp, type, -1));
 132     if (pid < 0) {
 133         Jim_ListAppendElement(interp, listObj, Jim_NewStringObj(interp, strerror(value), -1));
 134     }
 135     else {
 136         Jim_ListAppendElement(interp, listObj, Jim_NewIntObj(interp, value));
 137     }
 138     Jim_SetResult(interp, listObj);
 139     return JIM_OK;
 140 }
 141
 142 static int Jim_PosixGetidsCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 143 {
 144     Jim_Obj *objv[8];
 145
 146     if (argc != 1) {
 147         Jim_WrongNumArgs(interp, 1, argv, "");
 148         return JIM_ERR;
 149     }
 150     objv[0] = Jim_NewStringObj(interp, "uid", -1);
 151     objv[1] = Jim_NewIntObj(interp, getuid());
 152     objv[2] = Jim_NewStringObj(interp, "euid", -1);
 153     objv[3] = Jim_NewIntObj(interp, geteuid());
 154     objv[4] = Jim_NewStringObj(interp, "gid", -1);
 155     objv[5] = Jim_NewIntObj(interp, getgid());
 156     objv[6] = Jim_NewStringObj(interp, "egid", -1);
 157     objv[7] = Jim_NewIntObj(interp, getegid());
 158     Jim_SetResult(interp, Jim_NewListObj(interp, objv, 8));
 159     return JIM_OK;
 160 }
 161
 162 #define JIM_HOST_NAME_MAX 1024
 163 static int Jim_PosixGethostnameCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 164 {
 165     char buf[JIM_HOST_NAME_MAX];
 166
 167     if (argc != 1) {
 168         Jim_WrongNumArgs(interp, 1, argv, "");
 169         return JIM_ERR;
 170     }
 171     if (gethostname(buf, JIM_HOST_NAME_MAX) == -1) {
 172         Jim_PosixSetError(interp);
 173         return JIM_ERR;
 174     }
 175     Jim_SetResultString(interp, buf, -1);
 176     return JIM_OK;
 177 }
 178
 179 static int Jim_PosixUptimeCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 180 {
 181 #ifdef HAVE_SYSINFO
 182     struct sysinfo info;
 183
 184     if (argc != 1) {
 185         Jim_WrongNumArgs(interp, 1, argv, "");
 186         return JIM_ERR;
 187     }
 188
 189     if (sysinfo(&info) == -1) {
 190         Jim_PosixSetError(interp);
 191         return JIM_ERR;
 192     }
 193
 194     Jim_SetResultInt(interp, info.uptime);
 195 #else
 196     Jim_SetResultInt(interp, (long)time(NULL));
 197 #endif
 198     return JIM_OK;
 199 }
 200
 201 static int Jim_PosixPidCommand(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 202 {
 203     if (argc != 1) {
 204         Jim_WrongNumArgs(interp, 1, argv, "");
 205         return JIM_ERR;
 206     }
 207
 208     Jim_SetResultInt(interp, getpid());
 209     return JIM_OK;
 210 }
 211
 212 int Jim_posixInit(Jim_Interp *interp)
 213 {
 214 #ifdef HAVE_FORK
 215     Jim_CreateCommand(interp, "os.fork", Jim_PosixForkCommand, NULL, NULL);
 216 #endif
 217     Jim_CreateCommand(interp, "os.wait", Jim_PosixWaitCommand, NULL, NULL);
 218     Jim_CreateCommand(interp, "os.getids", Jim_PosixGetidsCommand, NULL, NULL);
 219     Jim_CreateCommand(interp, "os.gethostname", Jim_PosixGethostnameCommand, NULL, NULL);
 220     Jim_CreateCommand(interp, "os.uptime", Jim_PosixUptimeCommand, NULL, NULL);
 221     Jim_CreateCommand(interp, "pid", Jim_PosixPidCommand, NULL, NULL);
 222     return JIM_OK;
 223 }