* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
#define f_ops f_fglob->fg_ops
#define f_offset f_fglob->fg_offset
#define f_data f_fglob->fg_data
-#define PSEMNAMLEN 31 /* maximum name segment length we bother with */
+#define PSEMNAMLEN 31 /* maximum name segment length we bother with */
struct pseminfo {
- unsigned int psem_flags;
- unsigned int psem_usecount;
- mode_t psem_mode;
- uid_t psem_uid;
- gid_t psem_gid;
- char psem_name[PSEMNAMLEN + 1]; /* segment name */
- semaphore_t psem_semobject;
- struct label * psem_label;
- pid_t psem_creator_pid;
- uint64_t psem_creator_uniqueid;
+ unsigned int psem_flags;
+ unsigned int psem_usecount;
+ mode_t psem_mode;
+ uid_t psem_uid;
+ gid_t psem_gid;
+ char psem_name[PSEMNAMLEN + 1]; /* segment name */
+ semaphore_t psem_semobject;
+ struct label * psem_label;
+ pid_t psem_creator_pid;
+ uint64_t psem_creator_uniqueid;
};
#define PSEMINFO_NULL (struct pseminfo *)0
-#define PSEM_NONE 1
-#define PSEM_DEFINED 2
-#define PSEM_ALLOCATED 4
-#define PSEM_MAPPED 8
-#define PSEM_INUSE 0x10
-#define PSEM_REMOVED 0x20
-#define PSEM_INCREATE 0x40
-#define PSEM_INDELETE 0x80
-
-struct psemcache {
- LIST_ENTRY(psemcache) psem_hash; /* hash chain */
- struct pseminfo *pseminfo; /* vnode the name refers to */
- int psem_nlen; /* length of name */
- char psem_name[PSEMNAMLEN + 1]; /* segment name */
+#define PSEM_NONE 1
+#define PSEM_DEFINED 2
+#define PSEM_ALLOCATED 4
+#define PSEM_MAPPED 8
+#define PSEM_INUSE 0x10
+#define PSEM_REMOVED 0x20
+#define PSEM_INCREATE 0x40
+#define PSEM_INDELETE 0x80
+
+struct psemcache {
+ LIST_ENTRY(psemcache) psem_hash; /* hash chain */
+ struct pseminfo *pseminfo; /* vnode the name refers to */
+ int psem_nlen; /* length of name */
+ char psem_name[PSEMNAMLEN + 1]; /* segment name */
};
#define PSEMCACHE_NULL (struct psemcache *)0
#define PSEMCACHE_FOUND (-1)
#define PSEMCACHE_NEGATIVE (ENOENT)
-struct psemstats {
- long goodhits; /* hits that we can really use */
- long neghits; /* negative hits that we can use */
- long badhits; /* hits we must drop */
- long falsehits; /* hits with id mismatch */
- long miss; /* misses */
- long longnames; /* long names that ignore cache */
+struct psemstats {
+ long goodhits; /* hits that we can really use */
+ long neghits; /* negative hits that we can use */
+ long badhits; /* hits we must drop */
+ long falsehits; /* hits with id mismatch */
+ long miss; /* misses */
+ long longnames; /* long names that ignore cache */
};
struct psemname {
- char *psem_nameptr; /* pointer to looked up name */
- long psem_namelen; /* length of looked up component */
- u_int32_t psem_hash; /* hash value of looked up name */
+ char *psem_nameptr; /* pointer to looked up name */
+ long psem_namelen; /* length of looked up component */
+ u_int32_t psem_hash; /* hash value of looked up name */
};
struct psemnode {
#define PSEMHASH(pnp) \
(&psemhashtbl[(pnp)->psem_hash & psemhash])
-LIST_HEAD(psemhashhead, psemcache) *psemhashtbl; /* Hash Table */
-u_long psemhash; /* size of hash table - 1 */
-long psemnument; /* number of cache entries allocated */
-long posix_sem_max = 10000; /* tunable for max POSIX semaphores */
- /* 10000 limits to ~1M of memory */
+LIST_HEAD(psemhashhead, psemcache) * psemhashtbl; /* Hash Table */
+u_long psemhash; /* size of hash table - 1 */
+long psemnument; /* number of cache entries allocated */
+long posix_sem_max = 10000; /* tunable for max POSIX semaphores */
+ /* 10000 limits to ~1M of memory */
SYSCTL_NODE(_kern, KERN_POSIX, posix, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "Posix");
SYSCTL_NODE(_kern_posix, OID_AUTO, sem, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "Semaphores");
-SYSCTL_LONG (_kern_posix_sem, OID_AUTO, max, CTLFLAG_RW | CTLFLAG_LOCKED, &posix_sem_max, "max");
+SYSCTL_LONG(_kern_posix_sem, OID_AUTO, max, CTLFLAG_RW | CTLFLAG_LOCKED, &posix_sem_max, "max");
-struct psemstats psemstats; /* cache effectiveness statistics */
+struct psemstats psemstats; /* cache effectiveness statistics */
static int psem_access(struct pseminfo *pinfo, int mode, kauth_cred_t cred);
static int psem_cache_search(struct pseminfo **,
- struct psemname *, struct psemcache **);
+ struct psemname *, struct psemcache **);
static int psem_delete(struct pseminfo * pinfo);
-static int psem_read (struct fileproc *fp, struct uio *uio,
- int flags, vfs_context_t ctx);
-static int psem_write (struct fileproc *fp, struct uio *uio,
- int flags, vfs_context_t ctx);
-static int psem_ioctl (struct fileproc *fp, u_long com,
- caddr_t data, vfs_context_t ctx);
-static int psem_select (struct fileproc *fp, int which, void *wql, vfs_context_t ctx);
-static int psem_closefile (struct fileglob *fp, vfs_context_t ctx);
+static int psem_closefile(struct fileglob *fp, vfs_context_t ctx);
static int psem_unlink_internal(struct pseminfo *pinfo, struct psemcache *pcache);
-static int psem_kqfilter (struct fileproc *fp, struct knote *kn, vfs_context_t ctx);
-
static const struct fileops psemops = {
- .fo_type = DTYPE_PSXSEM,
- .fo_read = psem_read,
- .fo_write = psem_write,
- .fo_ioctl = psem_ioctl,
- .fo_select = psem_select,
- .fo_close = psem_closefile,
- .fo_kqfilter = psem_kqfilter,
- .fo_drain = NULL,
+ .fo_type = DTYPE_PSXSEM,
+ .fo_read = fo_no_read,
+ .fo_write = fo_no_write,
+ .fo_ioctl = fo_no_ioctl,
+ .fo_select = fo_no_select,
+ .fo_close = psem_closefile,
+ .fo_drain = fo_no_drain,
+ .fo_kqfilter = fo_no_kqfilter,
};
static lck_grp_t *psx_sem_subsys_lck_grp;
__private_extern__ void
psem_lock_init( void )
{
+ psx_sem_subsys_lck_grp_attr = lck_grp_attr_alloc_init();
- psx_sem_subsys_lck_grp_attr = lck_grp_attr_alloc_init();
-
- psx_sem_subsys_lck_grp = lck_grp_alloc_init("posix shared memory", psx_sem_subsys_lck_grp_attr);
+ psx_sem_subsys_lck_grp = lck_grp_alloc_init("posix shared memory", psx_sem_subsys_lck_grp_attr);
- psx_sem_subsys_lck_attr = lck_attr_alloc_init();
- lck_mtx_init(& psx_sem_subsys_mutex, psx_sem_subsys_lck_grp, psx_sem_subsys_lck_attr);
+ psx_sem_subsys_lck_attr = lck_attr_alloc_init();
+ lck_mtx_init(&psx_sem_subsys_mutex, psx_sem_subsys_lck_grp, psx_sem_subsys_lck_attr);
}
/*
- * Lookup an entry in the cache
- *
- *
+ * Lookup an entry in the cache
+ *
+ *
* status of -1 is returned if matches
* If the lookup determines that the name does not exist
* (negative cacheing), a status of ENOENT is returned. If the lookup
static int
psem_cache_search(struct pseminfo **psemp, struct psemname *pnp,
- struct psemcache **pcache)
+ struct psemcache **pcache)
{
struct psemcache *pcp, *nnp;
struct psemhashhead *pcpp;
for (pcp = pcpp->lh_first; pcp != 0; pcp = nnp) {
nnp = pcp->psem_hash.le_next;
if (pcp->psem_nlen == pnp->psem_namelen &&
- !bcmp(pcp->psem_name, pnp->psem_nameptr, (u_int)pcp-> psem_nlen))
+ !bcmp(pcp->psem_name, pnp->psem_nameptr, (u_int)pcp->psem_nlen)) {
break;
+ }
}
if (pcp == 0) {
}
/* We found a "positive" match, return the vnode */
- if (pcp->pseminfo) {
+ if (pcp->pseminfo) {
psemstats.goodhits++;
/* TOUCH(ncp); */
*psemp = pcp->pseminfo;
struct psemcache *dpcp;
#if DIAGNOSTIC
- if (pnp->psem_namelen > PSEMNAMLEN)
+ if (pnp->psem_namelen > PSEMNAMLEN) {
panic("cache_enter: name too long");
+ }
#endif
if (psem_cache_search(&dpinfo, pnp, &dpcp) == PSEMCACHE_FOUND) {
return EEXIST;
}
- if (psemnument >= posix_sem_max)
+ if (psemnument >= posix_sem_max) {
return ENOSPC;
+ }
psemnument++;
/*
* Fill in cache info, if vp is NULL this is a "negative" cache entry.
{
struct psemcache *p;
- for (p = pcpp->lh_first; p != 0; p = p->psem_hash.le_next)
- if (p == pcp)
+ for (p = pcpp->lh_first; p != 0; p = p->psem_hash.le_next) {
+ if (p == pcp) {
panic("psem:cache_enter duplicate");
+ }
+ }
}
#endif
LIST_INSERT_HEAD(pcpp, pcp, psem_hash);
psem_cache_delete(struct psemcache *pcp)
{
#if DIAGNOSTIC
- if (pcp->psem_hash.le_prev == 0)
+ if (pcp->psem_hash.le_prev == 0) {
panic("psem namecache purge le_prev");
- if (pcp->psem_hash.le_next == pcp)
+ }
+ if (pcp->psem_hash.le_next == pcp) {
panic("namecache purge le_next");
+ }
#endif /* DIAGNOSTIC */
LIST_REMOVE(pcp, psem_hash);
- pcp->psem_hash.le_prev = NULL;
+ pcp->psem_hash.le_prev = NULL;
psemnument--;
}
struct psemhashhead *pcpp;
int error = 0;
- if (kauth_cred_issuser(kauth_cred_get()) == 0)
+ if (kauth_cred_issuser(kauth_cred_get()) == 0) {
return EPERM;
+ }
PSEM_SUBSYS_LOCK();
for (pcpp = &psemhashtbl[psemhash]; pcpp >= psemhashtbl; pcpp--) {
* unconditionally unlink the cache entry
*/
error = psem_unlink_internal(pcp->pseminfo, pcp);
- if (error)
+ if (error) {
goto out;
+ }
}
}
assert(psemnument == 0);
out:
PSEM_SUBSYS_UNLOCK();
- if (error)
+ if (error) {
printf("%s: Error %d removing all semaphores: %ld remain!\n",
- __func__, error, psemnument);
+ __func__, error, psemnument);
+ }
return error;
}
char * nameptr;
char * cp;
size_t pathlen, plen;
- int fmode ;
+ int fmode;
int cmode = uap->mode;
int value = uap->value;
int incache = 0;
struct psemcache *pcp = PSEMCACHE_NULL;
- kern_return_t kret = KERN_INVALID_ADDRESS; /* default fail */
-
+ kern_return_t kret = KERN_INVALID_ADDRESS; /* default fail */
+
AUDIT_ARG(fflags, uap->oflag);
AUDIT_ARG(mode, uap->mode);
AUDIT_ARG(value32, uap->value);
* Preallocate everything we might need up front to avoid taking
* and dropping the lock, opening us up to race conditions.
*/
- MALLOC_ZONE(pnbuf, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);
+ MALLOC_ZONE(pnbuf, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK | M_ZERO);
if (pnbuf == NULL) {
error = ENOSPC;
goto bad;
goto bad;
}
AUDIT_ARG(text, pnbuf);
- if ( (pathlen > PSEMNAMLEN) ) {
+ if ((pathlen > PSEMNAMLEN)) {
error = ENAMETOOLONG;
goto bad;
}
error = EINVAL;
goto bad;
}
- } else {
+ } else {
error = EINVAL;
goto bad;
}
nd.psem_namelen = plen;
nd.psem_hash = 0;
- for (cp = nameptr, i=1; *cp != 0 && i <= plen; i++, cp++) {
- nd.psem_hash += (unsigned char)*cp * i;
+ for (cp = nameptr, i = 1; *cp != 0 && i <= plen; i++, cp++) {
+ nd.psem_hash += (unsigned char)*cp * i;
}
/*
* left unmodified (NULL).
*/
error = falloc(p, &fp, &indx, vfs_context_current());
- if (error)
+ if (error) {
goto bad;
+ }
/*
* We allocate a new entry if we are less than the maximum
* allowed and the one at the front of the LRU list is in use.
* Otherwise we use the one at the front of the LRU list.
*/
- MALLOC(pcp, struct psemcache *, sizeof(struct psemcache), M_SHM, M_WAITOK|M_ZERO);
+ MALLOC(pcp, struct psemcache *, sizeof(struct psemcache), M_SHM, M_WAITOK | M_ZERO);
if (pcp == PSEMCACHE_NULL) {
error = ENOMEM;
goto bad;
}
- MALLOC(new_pinfo, struct pseminfo *, sizeof(struct pseminfo), M_SHM, M_WAITOK|M_ZERO);
+ MALLOC(new_pinfo, struct pseminfo *, sizeof(struct pseminfo), M_SHM, M_WAITOK | M_ZERO);
if (new_pinfo == NULL) {
error = ENOSPC;
goto bad;
* signal success or failure, which is why we set its default value
* to KERN_INVALID_ADDRESS, above.
*/
-
+
fmode = FFLAGS(uap->oflag);
-
- if((fmode & O_CREAT)) {
-
- if((value < 0) || (value > SEM_VALUE_MAX)) {
+
+ if ((fmode & O_CREAT)) {
+ if ((value < 0) || (value > SEM_VALUE_MAX)) {
error = EINVAL;
goto bad;
}
-
+
kret = semaphore_create(kernel_task, &new_pinfo->psem_semobject, SYNC_POLICY_FIFO, value);
-
+
if (kret != KERN_SUCCESS) {
switch (kret) {
- case KERN_RESOURCE_SHORTAGE:
- error = ENOMEM;
- break;
- case KERN_PROTECTION_FAILURE:
- error = EACCES;
- break;
- default:
- error = EINVAL;
+ case KERN_RESOURCE_SHORTAGE:
+ error = ENOMEM;
+ break;
+ case KERN_PROTECTION_FAILURE:
+ error = EACCES;
+ break;
+ default:
+ error = EINVAL;
}
goto bad;
}
}
-
- MALLOC(new_pnode, struct psemnode *, sizeof(struct psemnode), M_SHM, M_WAITOK|M_ZERO);
+
+ MALLOC(new_pnode, struct psemnode *, sizeof(struct psemnode), M_SHM, M_WAITOK | M_ZERO);
if (new_pnode == NULL) {
error = ENOSPC;
goto bad;
goto bad_locked;
}
- if (error == PSEMCACHE_FOUND)
+ if (error == PSEMCACHE_FOUND) {
incache = 1;
- else
+ } else {
incache = 0;
+ }
cmode &= ALLPERMS;
- if (((fmode & (O_CREAT | O_EXCL))==(O_CREAT | O_EXCL)) && incache) {
+ if (((fmode & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) && incache) {
/* sem exists and opened O_EXCL */
#if notyet
if (pinfo->psem_flags & PSEM_INDELETE) {
}
-#endif
+#endif
AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid,
- pinfo->psem_gid, pinfo->psem_mode);
+ pinfo->psem_gid, pinfo->psem_mode);
error = EEXIST;
goto bad_locked;
}
- if (((fmode & (O_CREAT | O_EXCL))== O_CREAT) && incache) {
+ if (((fmode & (O_CREAT | O_EXCL)) == O_CREAT) && incache) {
/* As per POSIX, O_CREAT has no effect */
fmode &= ~O_CREAT;
}
- if ( (fmode & O_CREAT) ) {
+ if ((fmode & O_CREAT)) {
/* create a new one (commit the allocation) */
pinfo = new_pinfo;
pinfo->psem_flags = PSEM_DEFINED | PSEM_INCREATE;
pinfo->psem_uid = kauth_getuid();
pinfo->psem_gid = kauth_getgid();
bcopy(pnbuf, &pinfo->psem_name[0], PSEMNAMLEN);
- pinfo->psem_name[PSEMNAMLEN]= 0;
+ pinfo->psem_name[PSEMNAMLEN] = 0;
pinfo->psem_flags &= ~PSEM_DEFINED;
pinfo->psem_flags |= PSEM_ALLOCATED;
pinfo->psem_creator_pid = p->p_pid;
pinfo->psem_creator_uniqueid = p->p_uniqueid;
-
+
#if CONFIG_MACF
error = mac_posixsem_check_create(kauth_cred_get(), nameptr);
if (error) {
error = ENOENT;
goto bad_locked;
}
- if( pinfo->psem_flags & PSEM_INDELETE) {
+ if (pinfo->psem_flags & PSEM_INDELETE) {
error = ENOENT;
goto bad_locked;
- }
+ }
AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid,
- pinfo->psem_gid, pinfo->psem_mode);
+ pinfo->psem_gid, pinfo->psem_mode);
#if CONFIG_MACF
error = mac_posixsem_check_open(kauth_cred_get(), pinfo);
if (error) {
goto bad_locked;
}
#endif
- if ( (error = psem_access(pinfo, fmode, kauth_cred_get())) ) {
+ if ((error = psem_access(pinfo, fmode, kauth_cred_get()))) {
goto bad_locked;
}
}
if (!incache) {
/* if successful, this will consume the pcp */
- if ( (error = psem_cache_add(pinfo, &nd, pcp)) ) {
+ if ((error = psem_cache_add(pinfo, &nd, pcp))) {
goto bad_locked;
}
}
*retval = CAST_USER_ADDR_T(indx);
FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
- return (0);
+ return 0;
bad_locked:
PSEM_SUBSYS_UNLOCK();
bad:
- if (pcp != PSEMCACHE_NULL)
+ if (pcp != PSEMCACHE_NULL) {
FREE(pcp, M_SHM);
+ }
- if (new_pnode != PSEMNODE_NULL)
+ if (new_pnode != PSEMNODE_NULL) {
FREE(new_pnode, M_SHM);
+ }
- if (fp != NULL)
+ if (fp != NULL) {
fp_free(p, indx, fp);
+ }
if (new_pinfo != PSEMINFO_NULL) {
/*
FREE(new_pinfo, M_SHM);
}
- if (pnbuf != NULL)
+ if (pnbuf != NULL) {
FREE_ZONE(pnbuf, MAXPATHLEN, M_NAMEI);
- return (error);
+ }
+ return error;
}
/*
psem_access(struct pseminfo *pinfo, int mode, kauth_cred_t cred)
{
int mode_req = ((mode & FREAD) ? S_IRUSR : 0) |
- ((mode & FWRITE) ? S_IWUSR : 0);
+ ((mode & FWRITE) ? S_IWUSR : 0);
/* Otherwise, user id 0 always gets access. */
- if (!suser(cred, NULL))
- return (0);
+ if (!suser(cred, NULL)) {
+ return 0;
+ }
- return(posix_cred_access(cred, pinfo->psem_uid, pinfo->psem_gid, pinfo->psem_mode, mode_req));
+ return posix_cred_access(cred, pinfo->psem_uid, pinfo->psem_gid, pinfo->psem_mode, mode_req);
}
static int
{
PSEM_SUBSYS_ASSERT_HELD();
- if (!pinfo || !pcache)
+ if (!pinfo || !pcache) {
return EINVAL;
+ }
- if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED)) == 0)
+ if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED)) == 0) {
return EINVAL;
+ }
- if (pinfo->psem_flags & PSEM_INDELETE)
+ if (pinfo->psem_flags & PSEM_INDELETE) {
return 0;
+ }
AUDIT_ARG(posix_ipc_perm, pinfo->psem_uid, pinfo->psem_gid,
- pinfo->psem_mode);
+ pinfo->psem_mode);
pinfo->psem_flags |= PSEM_INDELETE;
pinfo->psem_usecount--;
if (!pinfo->psem_usecount) {
psem_delete(pinfo);
- FREE(pinfo,M_SHM);
+ FREE(pinfo, M_SHM);
} else {
pinfo->psem_flags |= PSEM_REMOVED;
}
sem_unlink(__unused proc_t p, struct sem_unlink_args *uap, __unused int32_t *retval)
{
size_t i;
- int error=0;
+ int error = 0;
struct psemname nd;
struct pseminfo *pinfo;
char * nameptr;
MALLOC_ZONE(pnbuf, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);
if (pnbuf == NULL) {
- return(ENOSPC); /* XXX non-standard */
+ return ENOSPC; /* XXX non-standard */
}
pathlen = MAXPATHLEN;
error = copyinstr(uap->name, pnbuf, MAXPATHLEN, &pathlen);
error = EINVAL;
goto bad;
}
- } else {
+ } else {
error = EINVAL;
goto bad;
}
nd.psem_nameptr = nameptr;
nd.psem_namelen = pathlen;
- nd. psem_hash =0;
+ nd.psem_hash = 0;
- for (cp = nameptr, i=1; *cp != 0 && i <= pathlen; i++, cp++) {
- nd.psem_hash += (unsigned char)*cp * i;
+ for (cp = nameptr, i = 1; *cp != 0 && i <= pathlen; i++, cp++) {
+ nd.psem_hash += (unsigned char)*cp * i;
}
PSEM_SUBSYS_LOCK();
if (error != PSEMCACHE_FOUND) {
PSEM_SUBSYS_UNLOCK();
- error = EINVAL;
+ error = ENOENT;
goto bad;
-
}
#if CONFIG_MACF
goto bad;
}
#endif
- if ( (error = psem_access(pinfo, pinfo->psem_mode, kauth_cred_get())) ) {
+ if ((error = psem_access(pinfo, pinfo->psem_mode, kauth_cred_get()))) {
PSEM_SUBSYS_UNLOCK();
goto bad;
}
int
sem_close(proc_t p, struct sem_close_args *uap, __unused int32_t *retval)
{
- int fd = CAST_DOWN_EXPLICIT(int,uap->sem);
+ int fd = CAST_DOWN_EXPLICIT(int, uap->sem);
struct fileproc *fp;
int error = 0;
AUDIT_ARG(fd, fd); /* XXX This seems wrong; uap->sem is a pointer */
proc_fdlock(p);
- error = fp_lookup(p,fd, &fp, 1);
+ error = fp_lookup(p, fd, &fp, 1);
if (error) {
proc_fdunlock(p);
- return(error);
+ return error;
+ }
+ if (fp->f_type != DTYPE_PSXSEM) {
+ fp_drop(p, fd, fp, 1);
+ proc_fdunlock(p);
+ return EBADF;
}
procfdtbl_markclosefd(p, fd);
+ /* release the ref returned from fp_lookup before calling drain */
+ (void) os_ref_release_locked(&fp->f_iocount);
fileproc_drain(p, fp);
fdrelse(p, fd);
error = closef_locked(fp, fp->f_fglob, p);
fileproc_free(fp);
proc_fdunlock(p);
- return(error);
+ return error;
}
int
sem_wait(proc_t p, struct sem_wait_args *uap, int32_t *retval)
{
__pthread_testcancel(1);
- return(sem_wait_nocancel(p, (struct sem_wait_nocancel_args *)uap, retval));
+ return sem_wait_nocancel(p, (struct sem_wait_nocancel_args *)uap, retval);
}
int
sem_wait_nocancel(proc_t p, struct sem_wait_nocancel_args *uap, __unused int32_t *retval)
{
- int fd = CAST_DOWN_EXPLICIT(int,uap->sem);
+ int fd = CAST_DOWN_EXPLICIT(int, uap->sem);
struct fileproc *fp;
struct pseminfo * pinfo;
- struct psemnode * pnode ;
+ struct psemnode * pnode;
kern_return_t kret;
int error;
error = fp_getfpsem(p, fd, &fp, &pnode);
- if (error)
- return (error);
- if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL ) {
+ if (error) {
+ return error;
+ }
+ if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL) {
error = EINVAL;
goto out;
}
error = EINVAL;
goto out;
}
- if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))
- != PSEM_ALLOCATED) {
+ if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))
+ != PSEM_ALLOCATED) {
PSEM_SUBSYS_UNLOCK();
error = EINVAL;
goto out;
}
out:
fp_drop(p, fd, fp, 0);
- return(error);
-
+ return error;
}
int
sem_trywait(proc_t p, struct sem_trywait_args *uap, __unused int32_t *retval)
{
- int fd = CAST_DOWN_EXPLICIT(int,uap->sem);
+ int fd = CAST_DOWN_EXPLICIT(int, uap->sem);
struct fileproc *fp;
struct pseminfo * pinfo;
- struct psemnode * pnode ;
+ struct psemnode * pnode;
kern_return_t kret;
mach_timespec_t wait_time;
int error;
-
+
error = fp_getfpsem(p, fd, &fp, &pnode);
- if (error)
- return (error);
- if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL ) {
+ if (error) {
+ return error;
+ }
+ if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL) {
error = EINVAL;
goto out;
}
error = EINVAL;
goto out;
}
- if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))
- != PSEM_ALLOCATED) {
+ if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))
+ != PSEM_ALLOCATED) {
PSEM_SUBSYS_UNLOCK();
error = EINVAL;
goto out;
}
out:
fp_drop(p, fd, fp, 0);
- return(error);
+ return error;
}
int
sem_post(proc_t p, struct sem_post_args *uap, __unused int32_t *retval)
{
- int fd = CAST_DOWN_EXPLICIT(int,uap->sem);
+ int fd = CAST_DOWN_EXPLICIT(int, uap->sem);
struct fileproc *fp;
struct pseminfo * pinfo;
- struct psemnode * pnode ;
+ struct psemnode * pnode;
kern_return_t kret;
int error;
error = fp_getfpsem(p, fd, &fp, &pnode);
- if (error)
- return (error);
- if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL ) {
+ if (error) {
+ return error;
+ }
+ if (((pnode = (struct psemnode *)fp->f_data)) == PSEMNODE_NULL) {
error = EINVAL;
goto out;
}
error = EINVAL;
goto out;
}
- if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))
- != PSEM_ALLOCATED) {
+ if ((pinfo->psem_flags & (PSEM_DEFINED | PSEM_ALLOCATED))
+ != PSEM_ALLOCATED) {
PSEM_SUBSYS_UNLOCK();
error = EINVAL;
goto out;
}
out:
fp_drop(p, fd, fp, 0);
- return(error);
+ return error;
}
static int
psem_close(struct psemnode *pnode, __unused int flags)
{
- int error=0;
+ int error = 0;
struct pseminfo *pinfo;
PSEM_SUBSYS_LOCK();
- if ((pinfo = pnode->pinfo) == PSEMINFO_NULL){
+ if ((pinfo = pnode->pinfo) == PSEMINFO_NULL) {
PSEM_SUBSYS_UNLOCK();
- return(EINVAL);
+ return EINVAL;
}
if ((pinfo->psem_flags & PSEM_ALLOCATED) != PSEM_ALLOCATED) {
PSEM_SUBSYS_UNLOCK();
- return(EINVAL);
+ return EINVAL;
}
#if DIAGNOSTIC
- if(!pinfo->psem_usecount) {
+ if (!pinfo->psem_usecount) {
kprintf("negative usecount in psem_close\n");
}
#endif /* DIAGNOSTIC */
pinfo->psem_usecount--;
- if ((pinfo->psem_flags & PSEM_REMOVED) && !pinfo->psem_usecount) {
+ if ((pinfo->psem_flags & PSEM_REMOVED) && !pinfo->psem_usecount) {
PSEM_SUBSYS_UNLOCK();
/* lock dropped as only semaphore is destroyed here */
error = psem_delete(pinfo);
- FREE(pinfo,M_SHM);
+ FREE(pinfo, M_SHM);
} else {
PSEM_SUBSYS_UNLOCK();
}
/* subsystem lock is dropped when we get here */
FREE(pnode, M_SHM);
- return (error);
+ return error;
}
static int
*/
error = psem_close(((struct psemnode *)fg->fg_data), fg->fg_flag);
- return(error);
+ return error;
}
-static int
+static int
psem_delete(struct pseminfo * pinfo)
{
kern_return_t kret;
switch (kret) {
case KERN_INVALID_ADDRESS:
case KERN_PROTECTION_FAILURE:
- return (EINVAL);
+ return EINVAL;
case KERN_ABORTED:
case KERN_OPERATION_TIMED_OUT:
- return (EINTR);
+ return EINTR;
case KERN_SUCCESS:
- return(0);
+ return 0;
default:
- return (EINVAL);
+ return EINVAL;
}
}
-static int
-psem_read(__unused struct fileproc *fp, __unused struct uio *uio,
- __unused int flags, __unused vfs_context_t ctx)
-{
- return(ENOTSUP);
-}
-
-static int
-psem_write(__unused struct fileproc *fp, __unused struct uio *uio,
- __unused int flags, __unused vfs_context_t ctx)
-{
- return(ENOTSUP);
-}
-
-static int
-psem_ioctl(__unused struct fileproc *fp, __unused u_long com,
- __unused caddr_t data, __unused vfs_context_t ctx)
-{
- return(ENOTSUP);
-}
-
-static int
-psem_select(__unused struct fileproc *fp, __unused int which,
- __unused void *wql, __unused vfs_context_t ctx)
-{
- return(ENOTSUP);
-}
-
-static int
-psem_kqfilter(__unused struct fileproc *fp, struct knote *kn,
- __unused vfs_context_t ctx)
-{
- kn->kn_flags = EV_ERROR;
- kn->kn_data = ENOTSUP;
- return 0;
-}
-
int
fill_pseminfo(struct psemnode *pnode, struct psem_info * info)
{
struct vinfo_stat *sb;
PSEM_SUBSYS_LOCK();
- if ((pinfo = pnode->pinfo) == PSEMINFO_NULL){
+ if ((pinfo = pnode->pinfo) == PSEMINFO_NULL) {
PSEM_SUBSYS_UNLOCK();
- return(EINVAL);
+ return EINVAL;
}
#if 0
if ((pinfo->psem_flags & PSEM_ALLOCATED) != PSEM_ALLOCATED) {
PSEM_SUBSYS_UNLOCK();
- return(EINVAL);
+ return EINVAL;
}
#endif
sb = &info->psem_stat;
bzero(sb, sizeof(struct vinfo_stat));
- sb->vst_mode = pinfo->psem_mode;
- sb->vst_uid = pinfo->psem_uid;
- sb->vst_gid = pinfo->psem_gid;
- sb->vst_size = pinfo->psem_usecount;
- bcopy(&pinfo->psem_name[0], &info->psem_name[0], PSEMNAMLEN+1);
+ sb->vst_mode = pinfo->psem_mode;
+ sb->vst_uid = pinfo->psem_uid;
+ sb->vst_gid = pinfo->psem_gid;
+ sb->vst_size = pinfo->psem_usecount;
+ bcopy(&pinfo->psem_name[0], &info->psem_name[0], PSEMNAMLEN + 1);
PSEM_SUBSYS_UNLOCK();
- return(0);
+ return 0;
}
#if CONFIG_MACF
pnode = (struct psemnode *)fp->f_fglob->fg_data;
if (pnode != NULL) {
psem = pnode->pinfo;
- if (psem != NULL)
+ if (psem != NULL) {
mac_posixsem_vnode_label_associate(
vfs_context_ucred(ctx), psem, psem->psem_label,
vp, vp->v_label);
+ }
}
PSEM_SUBSYS_UNLOCK();
}
#endif
-
projects / apple / xnu.git / blobdiff