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minix/servers/ipc/shm.c

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new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
#include "inc.h"
#define MAX_SHM_NR 1024
struct shm_struct {
key_t key;
int id;
struct shmid_ds shmid_ds;
vir_bytes page;
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
int vm_id;
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
};
retire PUBLIC, PRIVATE and FORWARD
2012-03-25 20:25:53 +02:00
static struct shm_struct shm_list[MAX_SHM_NR];
static int shm_list_nr = 0;
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
retire PUBLIC, PRIVATE and FORWARD
2012-03-25 20:25:53 +02:00
static struct shm_struct *shm_find_key(key_t key)
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
{
int i;
if (key == IPC_PRIVATE)
return NULL;
for (i = 0; i < shm_list_nr; i++)
if (shm_list[i].key == key)
return shm_list+i;
return NULL;
}
retire PUBLIC, PRIVATE and FORWARD
2012-03-25 20:25:53 +02:00
static struct shm_struct *shm_find_id(int id)
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
{
int i;
for (i = 0; i < shm_list_nr; i++)
if (shm_list[i].id == id)
return shm_list+i;
return NULL;
}
/*===========================================================================*
* do_shmget *
*===========================================================================*/
retire PUBLIC, PRIVATE and FORWARD
2012-03-25 20:25:53 +02:00
int do_shmget(message *m)
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
{
struct shm_struct *shm;
long key, size, old_size;
int flag;
int id;
key = m->SHMGET_KEY;
old_size = size = m->SHMGET_SIZE;
flag = m->SHMGET_FLAG;
if ((shm = shm_find_key(key))) {
if (!check_perm(&shm->shmid_ds.shm_perm, who_e, flag))
return EACCES;
if ((flag & IPC_CREAT) && (flag & IPC_EXCL))
return EEXIST;
if (size && shm->shmid_ds.shm_segsz < size)
return EINVAL;
id = shm->id;
} else { /* no key found */
if (!(flag & IPC_CREAT))
return ENOENT;
if (size <= 0)
return EINVAL;
/* round up to a multiple of PAGE_SIZE */
ARM updates Due to the ABI we are using we have to use the earm architecture moniker for the build system to behave correctly. This involves then some headers to move around. There is also a few related Makefile updates as well as minor source code corrections.
2013-01-13 17:20:11 +01:00
if (size % PAGE_SIZE)
size += PAGE_SIZE - size % PAGE_SIZE;
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
if (size <= 0)
return EINVAL;
if (shm_list_nr == MAX_SHM_NR)
return ENOMEM;
/* TODO: shmmni should be changed... */
if (identifier == SHMMNI)
return ENOSPC;
shm = &shm_list[shm_list_nr];
memset(shm, 0, sizeof(struct shm_struct));
rename mmap() and munmap() . it's a good extra interface to have but doesn't meet standardised functionality . applications (in pkgsrc) find it and expect full functionality the minix mmap doesn't offter . on the whole probably better to hide these functions (mmap and friends) until they are grown up; the base system can use the new minix_* names
2011-07-16 03:11:10 +02:00
shm->page = (vir_bytes) minix_mmap(0, size,
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
PROT_READ|PROT_WRITE, MAP_ANON, -1, 0);
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
if (shm->page == (vir_bytes) MAP_FAILED)
return ENOMEM;
libsys: various updates - move system calls for use by services from libminlib into libsys; - move srv_fork(2) and srv_kill(2) from RS and into libsys; - replace getprocnr(2) with sef_self(3); - rename previous getnprocnr(2) to getprocnr(2); - clean up getepinfo(2); - change all libsys calls that used _syscall to use _taskcall, so as to avoid going through errno to pass errors; this is already how most calls work anyway, and many of the calls previously using _syscall were already assumed to return the actual error; - initialize request messages to zero, for future compatibility (note that this does not include PCI calls, which are in need of a much bigger overhaul, nor kernel calls); - clean up more of dead DS code as a side effect. Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb
2013-11-03 22:33:44 +01:00
shm->vm_id = vm_getphys(sef_self(), (void *) shm->page);
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
memset((void *)shm->page, 0, size);
shm->shmid_ds.shm_perm.cuid =
shm->shmid_ds.shm_perm.uid = getnuid(who_e);
shm->shmid_ds.shm_perm.cgid =
shm->shmid_ds.shm_perm.gid = getngid(who_e);
shm->shmid_ds.shm_perm.mode = flag & 0777;
shm->shmid_ds.shm_segsz = old_size;
shm->shmid_ds.shm_atime = 0;
shm->shmid_ds.shm_dtime = 0;
shm->shmid_ds.shm_ctime = time(NULL);
shm->shmid_ds.shm_cpid = getnpid(who_e);
shm->shmid_ds.shm_lpid = 0;
shm->shmid_ds.shm_nattch = 0;
shm->id = id = identifier++;
shm->key = key;
shm_list_nr++;
}
m->SHMGET_RETID = id;
return OK;
}
/*===========================================================================*
* do_shmat *
*===========================================================================*/
retire PUBLIC, PRIVATE and FORWARD
2012-03-25 20:25:53 +02:00
int do_shmat(message *m)
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
{
int id, flag;
vir_bytes addr;
void *ret;
struct shm_struct *shm;
id = m->SHMAT_ID;
addr = (vir_bytes) m->SHMAT_ADDR;
flag = m->SHMAT_FLAG;
ARM updates Due to the ABI we are using we have to use the earm architecture moniker for the build system to behave correctly. This involves then some headers to move around. There is also a few related Makefile updates as well as minor source code corrections.
2013-01-13 17:20:11 +01:00
if (addr && (addr % PAGE_SIZE)) {
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
if (flag & SHM_RND)
ARM updates Due to the ABI we are using we have to use the earm architecture moniker for the build system to behave correctly. This involves then some headers to move around. There is also a few related Makefile updates as well as minor source code corrections.
2013-01-13 17:20:11 +01:00
addr -= (addr % PAGE_SIZE);
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
else
return EINVAL;
}
if (!(shm = shm_find_id(id)))
return EINVAL;
if (flag & SHM_RDONLY)
flag = 0444;
else
flag = 0666;
if (!check_perm(&shm->shmid_ds.shm_perm, who_e, flag))
return EACCES;
libsys: various updates - move system calls for use by services from libminlib into libsys; - move srv_fork(2) and srv_kill(2) from RS and into libsys; - replace getprocnr(2) with sef_self(3); - rename previous getnprocnr(2) to getprocnr(2); - clean up getepinfo(2); - change all libsys calls that used _syscall to use _taskcall, so as to avoid going through errno to pass errors; this is already how most calls work anyway, and many of the calls previously using _syscall were already assumed to return the actual error; - initialize request messages to zero, for future compatibility (note that this does not include PCI calls, which are in need of a much bigger overhaul, nor kernel calls); - clean up more of dead DS code as a side effect. Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb
2013-11-03 22:33:44 +01:00
ret = vm_remap(who_e, sef_self(), (void *)addr, (void *)shm->page,
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
shm->shmid_ds.shm_segsz);
if (ret == MAP_FAILED)
return ENOMEM;
shm->shmid_ds.shm_atime = time(NULL);
shm->shmid_ds.shm_lpid = getnpid(who_e);
/* nattach is updated lazily */
m->SHMAT_RETADDR = (long) ret;
return OK;
}
/*===========================================================================*
* update_refcount_and_destroy *
*===========================================================================*/
retire PUBLIC, PRIVATE and FORWARD
2012-03-25 20:25:53 +02:00
void update_refcount_and_destroy(void)
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
{
int i, j;
for (i = 0, j = 0; i < shm_list_nr; i++) {
u8_t rc;
libsys: various updates - move system calls for use by services from libminlib into libsys; - move srv_fork(2) and srv_kill(2) from RS and into libsys; - replace getprocnr(2) with sef_self(3); - rename previous getnprocnr(2) to getprocnr(2); - clean up getepinfo(2); - change all libsys calls that used _syscall to use _taskcall, so as to avoid going through errno to pass errors; this is already how most calls work anyway, and many of the calls previously using _syscall were already assumed to return the actual error; - initialize request messages to zero, for future compatibility (note that this does not include PCI calls, which are in need of a much bigger overhaul, nor kernel calls); - clean up more of dead DS code as a side effect. Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb
2013-11-03 22:33:44 +01:00
rc = vm_getrefcount(sef_self(), (void *) shm_list[i].page);
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
if (rc == (u8_t) -1) {
printf("IPC: can't find physical region.\n");
continue;
}
shm_list[i].shmid_ds.shm_nattch = rc - 1;
if (shm_list[i].shmid_ds.shm_nattch ||
!(shm_list[i].shmid_ds.shm_perm.mode & SHM_DEST)) {
if (i != j)
shm_list[j] = shm_list[i];
j++;
} else {
int size = shm_list[i].shmid_ds.shm_segsz;
ARM updates Due to the ABI we are using we have to use the earm architecture moniker for the build system to behave correctly. This involves then some headers to move around. There is also a few related Makefile updates as well as minor source code corrections.
2013-01-13 17:20:11 +01:00
if (size % PAGE_SIZE)
size += PAGE_SIZE - size % PAGE_SIZE;
rename mmap() and munmap() . it's a good extra interface to have but doesn't meet standardised functionality . applications (in pkgsrc) find it and expect full functionality the minix mmap doesn't offter . on the whole probably better to hide these functions (mmap and friends) until they are grown up; the base system can use the new minix_* names
2011-07-16 03:11:10 +02:00
minix_munmap((void *)shm_list[i].page, size);
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
}
}
shm_list_nr = j;
}
/*===========================================================================*
* do_shmdt *
*===========================================================================*/
retire PUBLIC, PRIVATE and FORWARD
2012-03-25 20:25:53 +02:00
int do_shmdt(message *m)
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
{
vir_bytes addr;
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
phys_bytes vm_id;
Miscellaneous code cleanup.
2010-03-22 21:43:06 +01:00
int i;
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
addr = m->SHMDT_ADDR;
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
if ((vm_id = vm_getphys(who_e, (void *) addr)) == 0)
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
return EINVAL;
for (i = 0; i < shm_list_nr; i++) {
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
if (shm_list[i].vm_id == vm_id) {
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
struct shm_struct *shm = &shm_list[i];
shm->shmid_ds.shm_atime = time(NULL);
shm->shmid_ds.shm_lpid = getnpid(who_e);
/* nattch is updated lazily */
vm_unmap(who_e, (void *) addr);
break;
}
}
if (i == shm_list_nr)
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
printf("IPC: do_shmdt impossible error! could not find id %lu to unmap\n",
vm_id);
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
update_refcount_and_destroy();
return OK;
}
/*===========================================================================*
* do_shmctl *
*===========================================================================*/
retire PUBLIC, PRIVATE and FORWARD
2012-03-25 20:25:53 +02:00
int do_shmctl(message *m)
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
{
int id = m->SHMCTL_ID;
int cmd = m->SHMCTL_CMD;
struct shmid_ds *ds = (struct shmid_ds *)m->SHMCTL_BUF;
struct shmid_ds tmp_ds;
various warning/errorwarning fixes for gcc47 . warnings (sometimes promoted to errors) in servers/ and kernel/ . -Os for ext2 boot module to make it small enough
2012-08-25 19:42:05 +02:00
struct shm_struct *shm = NULL;
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
struct shminfo sinfo;
struct shm_info s_info;
uid_t uid;
int r, i;
if (cmd == IPC_STAT)
update_refcount_and_destroy();
if ((cmd == IPC_STAT ||
cmd == IPC_SET ||
cmd == IPC_RMID) &&
!(shm = shm_find_id(id)))
return EINVAL;
switch (cmd) {
case IPC_STAT:
if (!ds)
return EFAULT;
/* check whether it has read permission */
if (!check_perm(&shm->shmid_ds.shm_perm, who_e, 0444))
return EACCES;
libsys: various updates - move system calls for use by services from libminlib into libsys; - move srv_fork(2) and srv_kill(2) from RS and into libsys; - replace getprocnr(2) with sef_self(3); - rename previous getnprocnr(2) to getprocnr(2); - clean up getepinfo(2); - change all libsys calls that used _syscall to use _taskcall, so as to avoid going through errno to pass errors; this is already how most calls work anyway, and many of the calls previously using _syscall were already assumed to return the actual error; - initialize request messages to zero, for future compatibility (note that this does not include PCI calls, which are in need of a much bigger overhaul, nor kernel calls); - clean up more of dead DS code as a side effect. Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb
2013-11-03 22:33:44 +01:00
r = sys_datacopy(SELF, (vir_bytes)&shm->shmid_ds,
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
who_e, (vir_bytes)ds, sizeof(struct shmid_ds));
if (r != OK)
return EFAULT;
break;
case IPC_SET:
uid = getnuid(who_e);
if (uid != shm->shmid_ds.shm_perm.cuid &&
uid != shm->shmid_ds.shm_perm.uid &&
uid != 0)
return EPERM;
r = sys_datacopy(who_e, (vir_bytes)ds,
libsys: various updates - move system calls for use by services from libminlib into libsys; - move srv_fork(2) and srv_kill(2) from RS and into libsys; - replace getprocnr(2) with sef_self(3); - rename previous getnprocnr(2) to getprocnr(2); - clean up getepinfo(2); - change all libsys calls that used _syscall to use _taskcall, so as to avoid going through errno to pass errors; this is already how most calls work anyway, and many of the calls previously using _syscall were already assumed to return the actual error; - initialize request messages to zero, for future compatibility (note that this does not include PCI calls, which are in need of a much bigger overhaul, nor kernel calls); - clean up more of dead DS code as a side effect. Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb
2013-11-03 22:33:44 +01:00
SELF, (vir_bytes)&tmp_ds, sizeof(struct shmid_ds));
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
if (r != OK)
return EFAULT;
shm->shmid_ds.shm_perm.uid = tmp_ds.shm_perm.uid;
shm->shmid_ds.shm_perm.gid = tmp_ds.shm_perm.gid;
shm->shmid_ds.shm_perm.mode &= ~0777;
shm->shmid_ds.shm_perm.mode |= tmp_ds.shm_perm.mode & 0666;
shm->shmid_ds.shm_ctime = time(NULL);
break;
case IPC_RMID:
uid = getnuid(who_e);
if (uid != shm->shmid_ds.shm_perm.cuid &&
uid != shm->shmid_ds.shm_perm.uid &&
uid != 0)
return EPERM;
shm->shmid_ds.shm_perm.mode |= SHM_DEST;
/* destroy if possible */
update_refcount_and_destroy();
break;
case IPC_INFO:
if (!ds)
return EFAULT;
sinfo.shmmax = (unsigned long) -1;
sinfo.shmmin = 1;
sinfo.shmmni = MAX_SHM_NR;
sinfo.shmseg = (unsigned long) -1;
sinfo.shmall = (unsigned long) -1;
libsys: various updates - move system calls for use by services from libminlib into libsys; - move srv_fork(2) and srv_kill(2) from RS and into libsys; - replace getprocnr(2) with sef_self(3); - rename previous getnprocnr(2) to getprocnr(2); - clean up getepinfo(2); - change all libsys calls that used _syscall to use _taskcall, so as to avoid going through errno to pass errors; this is already how most calls work anyway, and many of the calls previously using _syscall were already assumed to return the actual error; - initialize request messages to zero, for future compatibility (note that this does not include PCI calls, which are in need of a much bigger overhaul, nor kernel calls); - clean up more of dead DS code as a side effect. Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb
2013-11-03 22:33:44 +01:00
r = sys_datacopy(SELF, (vir_bytes)&sinfo,
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
who_e, (vir_bytes)ds, sizeof(struct shminfo));
if (r != OK)
return EFAULT;
m->SHMCTL_RET = shm_list_nr - 1;
if (m->SHMCTL_RET < 0)
m->SHMCTL_RET = 0;
break;
case SHM_INFO:
if (!ds)
return EFAULT;
s_info.used_ids = shm_list_nr;
s_info.shm_tot = 0;
for (i = 0; i < shm_list_nr; i++)
s_info.shm_tot +=
ARM updates Due to the ABI we are using we have to use the earm architecture moniker for the build system to behave correctly. This involves then some headers to move around. There is also a few related Makefile updates as well as minor source code corrections.
2013-01-13 17:20:11 +01:00
shm_list[i].shmid_ds.shm_segsz/PAGE_SIZE;
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
s_info.shm_rss = s_info.shm_tot;
s_info.shm_swp = 0;
s_info.swap_attempts = 0;
s_info.swap_successes = 0;
libsys: various updates - move system calls for use by services from libminlib into libsys; - move srv_fork(2) and srv_kill(2) from RS and into libsys; - replace getprocnr(2) with sef_self(3); - rename previous getnprocnr(2) to getprocnr(2); - clean up getepinfo(2); - change all libsys calls that used _syscall to use _taskcall, so as to avoid going through errno to pass errors; this is already how most calls work anyway, and many of the calls previously using _syscall were already assumed to return the actual error; - initialize request messages to zero, for future compatibility (note that this does not include PCI calls, which are in need of a much bigger overhaul, nor kernel calls); - clean up more of dead DS code as a side effect. Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb
2013-11-03 22:33:44 +01:00
r = sys_datacopy(SELF, (vir_bytes)&s_info,
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
who_e, (vir_bytes)ds, sizeof(struct shm_info));
if (r != OK)
return EFAULT;
m->SHMCTL_RET = shm_list_nr - 1;
if (m->SHMCTL_RET < 0)
m->SHMCTL_RET = 0;
break;
case SHM_STAT:
if (id < 0 || id >= shm_list_nr)
return EINVAL;
shm = &shm_list[id];
libsys: various updates - move system calls for use by services from libminlib into libsys; - move srv_fork(2) and srv_kill(2) from RS and into libsys; - replace getprocnr(2) with sef_self(3); - rename previous getnprocnr(2) to getprocnr(2); - clean up getepinfo(2); - change all libsys calls that used _syscall to use _taskcall, so as to avoid going through errno to pass errors; this is already how most calls work anyway, and many of the calls previously using _syscall were already assumed to return the actual error; - initialize request messages to zero, for future compatibility (note that this does not include PCI calls, which are in need of a much bigger overhaul, nor kernel calls); - clean up more of dead DS code as a side effect. Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb
2013-11-03 22:33:44 +01:00
r = sys_datacopy(SELF, (vir_bytes)&shm->shmid_ds,
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
who_e, (vir_bytes)ds, sizeof(struct shmid_ds));
if (r != OK)
return EFAULT;
m->SHMCTL_RET = shm->id;
break;
default:
return EINVAL;
}
return OK;
}
fix clang warnings -R in kernel/ and servers/
2011-06-09 16:09:13 +02:00
#if 0
retire PUBLIC, PRIVATE and FORWARD
2012-03-25 20:25:53 +02:00
static void list_shm_ds(void)
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
{
int i;
printf("key\tid\tpage\n");
for (i = 0; i < shm_list_nr; i++)
Fix a few compile time warnings
2010-07-02 14:41:19 +02:00
printf("%ld\t%d\t%lx\n",
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
shm_list[i].key,
shm_list[i].id,
shm_list[i].page);
}
fix clang warnings -R in kernel/ and servers/
2011-06-09 16:09:13 +02:00
#endif
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
/*===========================================================================*
* is_shm_nil *
*===========================================================================*/
retire PUBLIC, PRIVATE and FORWARD
2012-03-25 20:25:53 +02:00
int is_shm_nil(void)
new ipc server that implements shared memory and semaphores. this server, tests, vm support, library stubs and other contributions are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 16:53:13 +02:00
{
return (shm_list_nr == 0);
}
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