tools/testing/selftests/ipc/msgque.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <errno.h>
   5 #include <linux/msg.h>
   6 #include <fcntl.h>
   7
   8 #include "../kselftest.h"
   9
  10 #define MAX_MSG_SIZE            32
  11
  12 struct msg1 {
  13         int msize;
  14         long mtype;
  15         char mtext[MAX_MSG_SIZE];
  16 };
  17
  18 #define TEST_STRING "Test sysv5 msg"
  19 #define MSG_TYPE 1
  20
  21 #define ANOTHER_TEST_STRING "Yet another test sysv5 msg"
  22 #define ANOTHER_MSG_TYPE 26538
  23
  24 struct msgque_data {
  25         key_t key;
  26         int msq_id;
  27         int qbytes;
  28         int qnum;
  29         int mode;
  30         struct msg1 *messages;
  31 };
  32
  33 int restore_queue(struct msgque_data *msgque)
  34 {
  35         int fd, ret, id, i;
  36         char buf[32];
  37
  38         fd = open("/proc/sys/kernel/msg_next_id", O_WRONLY);
  39         if (fd == -1) {
  40                 printf("Failed to open /proc/sys/kernel/msg_next_id\n");
  41                 return -errno;
  42         }
  43         sprintf(buf, "%d", msgque->msq_id);
  44
  45         ret = write(fd, buf, strlen(buf));
  46         if (ret != strlen(buf)) {
  47                 printf("Failed to write to /proc/sys/kernel/msg_next_id\n");
  48                 return -errno;
  49         }
  50
  51         id = msgget(msgque->key, msgque->mode | IPC_CREAT | IPC_EXCL);
  52         if (id == -1) {
  53                 printf("Failed to create queue\n");
  54                 return -errno;
  55         }
  56
  57         if (id != msgque->msq_id) {
  58                 printf("Restored queue has wrong id (%d instead of %d)\n",
  59                                                         id, msgque->msq_id);
  60                 ret = -EFAULT;
  61                 goto destroy;
  62         }
  63
  64         for (i = 0; i < msgque->qnum; i++) {
  65                 if (msgsnd(msgque->msq_id, &msgque->messages[i].mtype,
  66                            msgque->messages[i].msize, IPC_NOWAIT) != 0) {
  67                         printf("msgsnd failed (%m)\n");
  68                         ret = -errno;
  69                         goto destroy;
  70                 };
  71         }
  72         return 0;
  73
  74 destroy:
  75         if (msgctl(id, IPC_RMID, 0))
  76                 printf("Failed to destroy queue: %d\n", -errno);
  77         return ret;
  78 }
  79
  80 int check_and_destroy_queue(struct msgque_data *msgque)
  81 {
  82         struct msg1 message;
  83         int cnt = 0, ret;
  84
  85         while (1) {
  86                 ret = msgrcv(msgque->msq_id, &message.mtype, MAX_MSG_SIZE,
  87                                 0, IPC_NOWAIT);
  88                 if (ret < 0) {
  89                         if (errno == ENOMSG)
  90                                 break;
  91                         printf("Failed to read IPC message: %m\n");
  92                         ret = -errno;
  93                         goto err;
  94                 }
  95                 if (ret != msgque->messages[cnt].msize) {
  96                         printf("Wrong message size: %d (expected %d)\n", ret,
  97                                                 msgque->messages[cnt].msize);
  98                         ret = -EINVAL;
  99                         goto err;
 100                 }
 101                 if (message.mtype != msgque->messages[cnt].mtype) {
 102                         printf("Wrong message type\n");
 103                         ret = -EINVAL;
 104                         goto err;
 105                 }
 106                 if (memcmp(message.mtext, msgque->messages[cnt].mtext, ret)) {
 107                         printf("Wrong message content\n");
 108                         ret = -EINVAL;
 109                         goto err;
 110                 }
 111                 cnt++;
 112         }
 113
 114         if (cnt != msgque->qnum) {
 115                 printf("Wrong message number\n");
 116                 ret = -EINVAL;
 117                 goto err;
 118         }
 119
 120         ret = 0;
 121 err:
 122         if (msgctl(msgque->msq_id, IPC_RMID, 0)) {
 123                 printf("Failed to destroy queue: %d\n", -errno);
 124                 return -errno;
 125         }
 126         return ret;
 127 }
 128
 129 int dump_queue(struct msgque_data *msgque)
 130 {
 131         struct msqid64_ds ds;
 132         int kern_id;
 133         int i, ret;
 134
 135         for (kern_id = 0; kern_id < 256; kern_id++) {
 136                 ret = msgctl(kern_id, MSG_STAT, &ds);
 137                 if (ret < 0) {
 138                         if (errno == -EINVAL)
 139                                 continue;
 140                         printf("Failed to get stats for IPC queue with id %d\n",
 141                                         kern_id);
 142                         return -errno;
 143                 }
 144
 145                 if (ret == msgque->msq_id)
 146                         break;
 147         }
 148
 149         msgque->messages = malloc(sizeof(struct msg1) * ds.msg_qnum);
 150         if (msgque->messages == NULL) {
 151                 printf("Failed to get stats for IPC queue\n");
 152                 return -ENOMEM;
 153         }
 154
 155         msgque->qnum = ds.msg_qnum;
 156         msgque->mode = ds.msg_perm.mode;
 157         msgque->qbytes = ds.msg_qbytes;
 158
 159         for (i = 0; i < msgque->qnum; i++) {
 160                 ret = msgrcv(msgque->msq_id, &msgque->messages[i].mtype,
 161                                 MAX_MSG_SIZE, i, IPC_NOWAIT | MSG_COPY);
 162                 if (ret < 0) {
 163                         printf("Failed to copy IPC message: %m (%d)\n", errno);
 164                         return -errno;
 165                 }
 166                 msgque->messages[i].msize = ret;
 167         }
 168         return 0;
 169 }
 170
 171 int fill_msgque(struct msgque_data *msgque)
 172 {
 173         struct msg1 msgbuf;
 174
 175         msgbuf.mtype = MSG_TYPE;
 176         memcpy(msgbuf.mtext, TEST_STRING, sizeof(TEST_STRING));
 177         if (msgsnd(msgque->msq_id, &msgbuf.mtype, sizeof(TEST_STRING),
 178                                 IPC_NOWAIT) != 0) {
 179                 printf("First message send failed (%m)\n");
 180                 return -errno;
 181         };
 182
 183         msgbuf.mtype = ANOTHER_MSG_TYPE;
 184         memcpy(msgbuf.mtext, ANOTHER_TEST_STRING, sizeof(ANOTHER_TEST_STRING));
 185         if (msgsnd(msgque->msq_id, &msgbuf.mtype, sizeof(ANOTHER_TEST_STRING),
 186                                 IPC_NOWAIT) != 0) {
 187                 printf("Second message send failed (%m)\n");
 188                 return -errno;
 189         };
 190         return 0;
 191 }
 192
 193 int main(int argc, char **argv)
 194 {
 195         int msg, pid, err;
 196         struct msgque_data msgque;
 197
 198         if (getuid() != 0) {
 199                 printf("Please run the test as root - Exiting.\n");
 200                 return ksft_exit_fail();
 201         }
 202
 203         msgque.key = ftok(argv[0], 822155650);
 204         if (msgque.key == -1) {
 205                 printf("Can't make key: %d\n", -errno);
 206                 return ksft_exit_fail();
 207         }
 208
 209         msgque.msq_id = msgget(msgque.key, IPC_CREAT | IPC_EXCL | 0666);
 210         if (msgque.msq_id == -1) {
 211                 err = -errno;
 212                 printf("Can't create queue: %d\n", err);
 213                 goto err_out;
 214         }
 215
 216         err = fill_msgque(&msgque);
 217         if (err) {
 218                 printf("Failed to fill queue: %d\n", err);
 219                 goto err_destroy;
 220         }
 221
 222         err = dump_queue(&msgque);
 223         if (err) {
 224                 printf("Failed to dump queue: %d\n", err);
 225                 goto err_destroy;
 226         }
 227
 228         err = check_and_destroy_queue(&msgque);
 229         if (err) {
 230                 printf("Failed to check and destroy queue: %d\n", err);
 231                 goto err_out;
 232         }
 233
 234         err = restore_queue(&msgque);
 235         if (err) {
 236                 printf("Failed to restore queue: %d\n", err);
 237                 goto err_destroy;
 238         }
 239
 240         err = check_and_destroy_queue(&msgque);
 241         if (err) {
 242                 printf("Failed to test queue: %d\n", err);
 243                 goto err_out;
 244         }
 245         return ksft_exit_pass();
 246
 247 err_destroy:
 248         if (msgctl(msgque.msq_id, IPC_RMID, 0)) {
 249                 printf("Failed to destroy queue: %d\n", -errno);
 250                 return ksft_exit_fail();
 251         }
 252 err_out:
 253         return ksft_exit_fail();
 254 }