272 lines
6.7 KiB
C
272 lines
6.7 KiB
C
/***************************************************************************
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* Copyright 1995, Technion, Israel Institute of Technology
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* Electrical Eng, Software Lab.
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* Author: Michael Veksler.
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***************************************************************************
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* File: shm_main_blk.c
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* Purpose: Main Wine's shared memory block
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***************************************************************************
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*/
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#ifdef CONFIG_IPC
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#include <sys/types.h>
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#include <sys/sem.h>
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#include <time.h>
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#include <assert.h>
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#include <unistd.h>
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#include <errno.h>
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#include <signal.h>
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#include "debugtools.h"
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#include "shm_fragment.h"
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#include "shm_block.h"
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#include "shm_main_blk.h"
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#include "shm_semaph.h"
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DEFAULT_DEBUG_CHANNEL(shm)
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#define WineKey ( 'W'+((int)'i'<<8)+((int)'n'<<16)+((int)'e'<<24) )
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#define SHM_KEY_RANGE 8
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/* main block (set during initialization) */
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struct shm_main_block *main_block=NULL;
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static char *shm_header="Wine - Windows emulator DDE mechanism";
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static int main_shm_id;
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static void shm_main_refresh();
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/* for debugging only */
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static void print_perm(struct ipc_perm *perm)
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{
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printf("Permission:\n");
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/* FIXME: not portable
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printf("\tKey=%d, mode=%03o, sequence #=%d\n",
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(int)perm->key,perm->mode, perm->seq);
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*/
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printf("\towner: uid=%d, gid=%d ;" ,perm->uid, perm->gid);
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printf(" creator: uid=%d, gid=%d\n",perm->cuid,perm->cgid);
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}
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/* for debugging only */
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/* print_shm_info: print shared memory descriptor info */
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static void print_shm_info(int shm_id)
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{
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struct shmid_ds ds;
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shmctl(shm_id, IPC_STAT, &ds );
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printf("shm_id=%d, Size=0x%08x , Number of attaches=%d\n",
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shm_id, ds.shm_segsz, (int)ds.shm_nattch);
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if (ds.shm_atime)
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printf("Last attach=%s",ctime(&ds.shm_atime));
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if (ds.shm_dtime)
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printf("Last detach=%s",ctime(&ds.shm_dtime));
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printf("Last change=%s",ctime(&ds.shm_ctime));
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printf("pid: creator=%d, last operator=%d\n",
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(int)ds.shm_cpid,(int)ds.shm_lpid);
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print_perm( &ds.shm_perm);
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}
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int proc_exist(pid_t pid)
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{
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if ( kill(pid,0) == 0) /* dummy signal to test existence */
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return 1;
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else if (errno==ESRCH) /* "no such process" */
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return 0;
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else
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return 1;
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}
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/* setup a new main shm block (only construct a shm block object). */
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static void shm_setup_main_block()
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{
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TRACE("creating data structure\n");
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main_block->build_lock=1;
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strcpy(main_block->magic, shm_header);
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shm_setup_block(&main_block->block,sizeof(*main_block),SHM_MINBLOCK);
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dde_proc_init(main_block->proc);
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ATOM_GlobalInit();
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shm_sem_init(&main_block->sem);
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/* main block set and data structure is stable now */
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main_block->build_lock=0;
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}
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/* Delete everything related to main_block */
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void shm_delete_all(int shmid)
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{
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int proc_idx;
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if (shmid == -1)
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shmid= main_shm_id;
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shmctl( shmid, IPC_RMID, NULL);
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for (proc_idx= 0 ; proc_idx < DDE_PROCS ; proc_idx++)
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dde_proc_done( &main_block->proc[proc_idx] );
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shm_sem_done(&main_block->sem);
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shmdt( (void *) main_block);
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main_block= NULL;
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}
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int DDE_no_of_attached()
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{
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struct shmid_ds shm_info;
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if (shmctl(main_shm_id, IPC_STAT, &shm_info) == -1)
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return -1;
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return shm_info.shm_nattch;
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}
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/*
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** Test if shm_id is MainBlock and attach it (if it is),
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** Return 1 if ok, 0 otherwise.
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*/
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static int attach_MainBlock(int shm_id)
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{
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struct shmid_ds shm_info;
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if (shmctl(shm_id, IPC_STAT, &shm_info) == -1)
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return 0;
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/* Make sure we don't work on somebody else's block */
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if (shm_info.shm_perm.cuid != getuid()) { /* creator is not me */
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WARN("Creator is not me!\n");
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return 0;
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}
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TRACE("shared memory exist, attaching anywhere\n");
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main_block=(struct shm_main_block *)shmat(shm_id, 0, 0);
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if ( (int)main_block==-1) {
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WARN("Attach failed\n");
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return 0;
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}
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if (strcmp(main_block->magic, shm_header) != 0) {
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TRACE("Detaching, wrong magic\n");
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shmdt((void *)main_block);
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return 0;
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}
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if (TRACE_ON(shm))
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print_shm_info(shm_id);
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/* Is it an old unused block ? */
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if (shm_info.shm_nattch == 0) {
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TRACE("No attaches, deleting old data\n");
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shm_delete_all(shm_id);
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return 0;
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}
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/* Wait for data structure to stabilize */
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while (main_block->build_lock)
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usleep(10000);
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main_shm_id= shm_id;
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shm_main_refresh();
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return 1;
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}
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/* (Function used by the constructor)
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* Try to get existing shared memory with key="Wine", size=SHM_MINBLOCK
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* complete user permission.
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* If such block is found - return true (1), else return false (0)
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*/
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static int shm_locate_MainBlock(key_t shm_key)
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{
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int shm_id; /* Descriptor to this shared memory */
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int i;
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TRACE("trying to attach, key=0x%x\n",
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shm_key);
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for (i=0 ; i < SHM_KEY_RANGE ; i++) {
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TRACE("iteration=%d\n", i);
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shm_id= shmget ( shm_key+i, SHM_MINBLOCK ,0700);
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if (shm_id != -1) {
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if ( attach_MainBlock(shm_id) ) {
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return 1; /* success! */
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}
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} else {
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switch(errno) {
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#ifdef EIDRM
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case EIDRM: /* segment destroyed */
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#endif
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case EACCES: /* no user permision */
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break;
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case ENOMEM: /* no free memory */
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case ENOENT: /* this key does not exist */
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default :
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WARN("shmget failed, errno=%d, %s\n",
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errno, strerror(errno) );
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return 0; /* Failed */
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}
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} /* if .. else */
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} /* for */
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return 0;
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}
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/* (Function used by the constructor)
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* Try to allocate new shared memory with key="Wine", size=SHM_MINBLOCK
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* with complete user permission.
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* If allocation succeeds - return true (1), else return false (0)
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*/
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static int shm_create_MainBlock(key_t MainShmKey)
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{
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int shm_id;
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int flags= 0700 | IPC_CREAT | IPC_EXCL;
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int i;
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TRACE("creating shared memory\n");
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/* try to allocate shared memory with key="Wine", size=SHM_MINBLOCK, */
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/* complete user permission */
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for (i=0 ; i < SHM_KEY_RANGE ; i++) {
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shm_id= shmget ( (key_t) MainShmKey, SHM_MINBLOCK, flags);
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if (shm_id != -1)
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break;
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}
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if (shm_id == -1) {
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WARN("failed to create shared memory\n");
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return 0;
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}
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TRACE("shared memory created, attaching\n");
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main_block=(struct shm_main_block*) shmat(shm_id, 0,0);
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if (TRACE_ON(shm))
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print_shm_info(shm_id);
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main_shm_id= shm_id;
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shm_setup_main_block();
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dde_wnd_setup();
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return 1;
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}
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/* link to the dde shared memory block */
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/* RETURN: 0 on success, non zero on failure */
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int shm_init(void)
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{
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if ( !shm_locate_MainBlock(WineKey)
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&& !shm_create_MainBlock(WineKey)) {
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ERR("Failed to init main shm block\n");
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exit(1);
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}
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dde_proc_add(main_block->proc);
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return 0;
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}
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static void shm_main_refresh()
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{
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int proc_idx;
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for (proc_idx= 0 ; proc_idx < DDE_PROCS ; proc_idx++)
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dde_proc_refresh( &main_block->proc[proc_idx] );
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}
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#endif /* CONFIG_IPC */
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