349 lines
8.5 KiB
C
349 lines
8.5 KiB
C
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#include "inc.h"
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#define MAX_SHM_NR 1024
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struct shm_struct {
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key_t key;
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int id;
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struct shmid_ds shmid_ds;
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vir_bytes page;
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phys_bytes phys;
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};
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PRIVATE struct shm_struct shm_list[MAX_SHM_NR];
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PRIVATE int shm_list_nr = 0;
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PRIVATE struct shm_struct *shm_find_key(key_t key)
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{
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int i;
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if (key == IPC_PRIVATE)
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return NULL;
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for (i = 0; i < shm_list_nr; i++)
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if (shm_list[i].key == key)
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return shm_list+i;
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return NULL;
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}
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PRIVATE struct shm_struct *shm_find_id(int id)
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{
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int i;
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for (i = 0; i < shm_list_nr; i++)
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if (shm_list[i].id == id)
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return shm_list+i;
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return NULL;
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}
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/*===========================================================================*
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* do_shmget *
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*===========================================================================*/
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PUBLIC int do_shmget(message *m)
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{
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struct shm_struct *shm;
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long key, size, old_size;
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int flag;
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int id;
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key = m->SHMGET_KEY;
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old_size = size = m->SHMGET_SIZE;
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flag = m->SHMGET_FLAG;
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if ((shm = shm_find_key(key))) {
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if (!check_perm(&shm->shmid_ds.shm_perm, who_e, flag))
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return EACCES;
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if ((flag & IPC_CREAT) && (flag & IPC_EXCL))
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return EEXIST;
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if (size && shm->shmid_ds.shm_segsz < size)
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return EINVAL;
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id = shm->id;
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} else { /* no key found */
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if (!(flag & IPC_CREAT))
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return ENOENT;
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if (size <= 0)
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return EINVAL;
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/* round up to a multiple of PAGE_SIZE */
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if (size % I386_PAGE_SIZE)
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size += I386_PAGE_SIZE - size % I386_PAGE_SIZE;
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if (size <= 0)
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return EINVAL;
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if (shm_list_nr == MAX_SHM_NR)
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return ENOMEM;
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/* TODO: shmmni should be changed... */
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if (identifier == SHMMNI)
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return ENOSPC;
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shm = &shm_list[shm_list_nr];
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memset(shm, 0, sizeof(struct shm_struct));
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shm->page = (vir_bytes) mmap(0, size,
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PROT_READ|PROT_WRITE,
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MAP_CONTIG|MAP_PREALLOC|MAP_ANON|MAP_SHARED,
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-1, 0);
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if (shm->page == (vir_bytes) MAP_FAILED)
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return ENOMEM;
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shm->phys = vm_getphys(SELF_E, (void *) shm->page);
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memset((void *)shm->page, 0, size);
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shm->shmid_ds.shm_perm.cuid =
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shm->shmid_ds.shm_perm.uid = getnuid(who_e);
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shm->shmid_ds.shm_perm.cgid =
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shm->shmid_ds.shm_perm.gid = getngid(who_e);
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shm->shmid_ds.shm_perm.mode = flag & 0777;
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shm->shmid_ds.shm_segsz = old_size;
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shm->shmid_ds.shm_atime = 0;
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shm->shmid_ds.shm_dtime = 0;
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shm->shmid_ds.shm_ctime = time(NULL);
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shm->shmid_ds.shm_cpid = getnpid(who_e);
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shm->shmid_ds.shm_lpid = 0;
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shm->shmid_ds.shm_nattch = 0;
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shm->id = id = identifier++;
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shm->key = key;
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shm_list_nr++;
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}
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m->SHMGET_RETID = id;
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return OK;
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}
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/*===========================================================================*
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* do_shmat *
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*===========================================================================*/
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PUBLIC int do_shmat(message *m)
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{
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int id, flag;
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vir_bytes addr;
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void *ret;
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struct shm_struct *shm;
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id = m->SHMAT_ID;
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addr = (vir_bytes) m->SHMAT_ADDR;
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flag = m->SHMAT_FLAG;
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if (addr && (addr % I386_PAGE_SIZE)) {
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if (flag & SHM_RND)
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addr -= (addr % I386_PAGE_SIZE);
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else
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return EINVAL;
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}
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if (!(shm = shm_find_id(id)))
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return EINVAL;
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if (flag & SHM_RDONLY)
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flag = 0444;
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else
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flag = 0666;
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if (!check_perm(&shm->shmid_ds.shm_perm, who_e, flag))
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return EACCES;
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ret = vm_remap(who_e, SELF_E, (void *)addr, (void *)shm->page,
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shm->shmid_ds.shm_segsz);
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if (ret == MAP_FAILED)
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return ENOMEM;
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shm->shmid_ds.shm_atime = time(NULL);
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shm->shmid_ds.shm_lpid = getnpid(who_e);
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/* nattach is updated lazily */
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m->SHMAT_RETADDR = (long) ret;
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return OK;
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}
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/*===========================================================================*
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* update_refcount_and_destroy *
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*===========================================================================*/
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PUBLIC void update_refcount_and_destroy(void)
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{
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int i, j;
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for (i = 0, j = 0; i < shm_list_nr; i++) {
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u8_t rc;
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rc = vm_getrefcount(SELF_E, (void *) shm_list[i].page);
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if (rc == (u8_t) -1) {
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printf("IPC: can't find physical region.\n");
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continue;
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}
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shm_list[i].shmid_ds.shm_nattch = rc - 1;
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if (shm_list[i].shmid_ds.shm_nattch ||
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!(shm_list[i].shmid_ds.shm_perm.mode & SHM_DEST)) {
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if (i != j)
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shm_list[j] = shm_list[i];
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j++;
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} else {
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int size = shm_list[i].shmid_ds.shm_segsz;
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if (size % I386_PAGE_SIZE)
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size += I386_PAGE_SIZE - size % I386_PAGE_SIZE;
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munmap((void *)shm_list[i].page, size);
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}
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}
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shm_list_nr = j;
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}
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/*===========================================================================*
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* do_shmdt *
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*===========================================================================*/
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PUBLIC int do_shmdt(message *m)
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{
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struct shm_struct *shm;
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vir_bytes addr;
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phys_bytes paddr;
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int n, i;
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addr = m->SHMDT_ADDR;
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if ((paddr = vm_getphys(who_e, (void *) addr)) == 0)
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return EINVAL;
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for (i = 0; i < shm_list_nr; i++) {
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if (shm_list[i].phys == paddr) {
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struct shm_struct *shm = &shm_list[i];
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shm->shmid_ds.shm_atime = time(NULL);
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shm->shmid_ds.shm_lpid = getnpid(who_e);
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/* nattch is updated lazily */
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vm_unmap(who_e, (void *) addr);
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break;
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}
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}
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if (i == shm_list_nr)
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fprintf(stderr, "IPC: do_shmdt impossible error!\n");
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update_refcount_and_destroy();
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return OK;
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}
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/*===========================================================================*
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* do_shmctl *
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*===========================================================================*/
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PUBLIC int do_shmctl(message *m)
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{
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int id = m->SHMCTL_ID;
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int cmd = m->SHMCTL_CMD;
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struct shmid_ds *ds = (struct shmid_ds *)m->SHMCTL_BUF;
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struct shmid_ds tmp_ds;
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struct shm_struct *shm;
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struct shminfo sinfo;
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struct shm_info s_info;
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uid_t uid;
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int r, i;
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if (cmd == IPC_STAT)
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update_refcount_and_destroy();
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if ((cmd == IPC_STAT ||
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cmd == IPC_SET ||
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cmd == IPC_RMID) &&
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!(shm = shm_find_id(id)))
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return EINVAL;
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switch (cmd) {
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case IPC_STAT:
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if (!ds)
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return EFAULT;
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/* check whether it has read permission */
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if (!check_perm(&shm->shmid_ds.shm_perm, who_e, 0444))
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return EACCES;
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r = sys_datacopy(SELF_E, (vir_bytes)&shm->shmid_ds,
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who_e, (vir_bytes)ds, sizeof(struct shmid_ds));
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if (r != OK)
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return EFAULT;
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break;
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case IPC_SET:
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uid = getnuid(who_e);
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if (uid != shm->shmid_ds.shm_perm.cuid &&
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uid != shm->shmid_ds.shm_perm.uid &&
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uid != 0)
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return EPERM;
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r = sys_datacopy(who_e, (vir_bytes)ds,
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SELF_E, (vir_bytes)&tmp_ds, sizeof(struct shmid_ds));
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if (r != OK)
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return EFAULT;
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shm->shmid_ds.shm_perm.uid = tmp_ds.shm_perm.uid;
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shm->shmid_ds.shm_perm.gid = tmp_ds.shm_perm.gid;
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shm->shmid_ds.shm_perm.mode &= ~0777;
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shm->shmid_ds.shm_perm.mode |= tmp_ds.shm_perm.mode & 0666;
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shm->shmid_ds.shm_ctime = time(NULL);
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break;
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case IPC_RMID:
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uid = getnuid(who_e);
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if (uid != shm->shmid_ds.shm_perm.cuid &&
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uid != shm->shmid_ds.shm_perm.uid &&
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uid != 0)
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return EPERM;
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shm->shmid_ds.shm_perm.mode |= SHM_DEST;
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/* destroy if possible */
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update_refcount_and_destroy();
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break;
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case IPC_INFO:
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if (!ds)
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return EFAULT;
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sinfo.shmmax = (unsigned long) -1;
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sinfo.shmmin = 1;
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sinfo.shmmni = MAX_SHM_NR;
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sinfo.shmseg = (unsigned long) -1;
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sinfo.shmall = (unsigned long) -1;
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r = sys_datacopy(SELF_E, (vir_bytes)&sinfo,
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who_e, (vir_bytes)ds, sizeof(struct shminfo));
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if (r != OK)
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return EFAULT;
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m->SHMCTL_RET = shm_list_nr - 1;
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if (m->SHMCTL_RET < 0)
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m->SHMCTL_RET = 0;
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break;
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case SHM_INFO:
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if (!ds)
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return EFAULT;
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s_info.used_ids = shm_list_nr;
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s_info.shm_tot = 0;
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for (i = 0; i < shm_list_nr; i++)
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s_info.shm_tot +=
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shm_list[i].shmid_ds.shm_segsz/I386_PAGE_SIZE;
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s_info.shm_rss = s_info.shm_tot;
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s_info.shm_swp = 0;
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s_info.swap_attempts = 0;
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s_info.swap_successes = 0;
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r = sys_datacopy(SELF_E, (vir_bytes)&s_info,
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who_e, (vir_bytes)ds, sizeof(struct shm_info));
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if (r != OK)
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return EFAULT;
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m->SHMCTL_RET = shm_list_nr - 1;
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if (m->SHMCTL_RET < 0)
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m->SHMCTL_RET = 0;
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break;
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case SHM_STAT:
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if (id < 0 || id >= shm_list_nr)
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return EINVAL;
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shm = &shm_list[id];
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r = sys_datacopy(SELF_E, (vir_bytes)&shm->shmid_ds,
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who_e, (vir_bytes)ds, sizeof(struct shmid_ds));
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if (r != OK)
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return EFAULT;
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m->SHMCTL_RET = shm->id;
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break;
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default:
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return EINVAL;
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}
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return OK;
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}
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PUBLIC void list_shm_ds(void)
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{
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int i;
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printf("key\tid\tpage\n");
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for (i = 0; i < shm_list_nr; i++)
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printf("%d\t%d\t%x\n",
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shm_list[i].key,
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shm_list[i].id,
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shm_list[i].page);
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}
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/*===========================================================================*
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* is_shm_nil *
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*===========================================================================*/
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PUBLIC int is_shm_nil(void)
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{
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return (shm_list_nr == 0);
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}
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