uipc_shm.c (d8fee543ec64428c4a06901c5b2d2a065029837a) uipc_shm.c (90f54cbfeb973c0e2ee7b617b7759ac4335a9efe)
1/*-
2 * Copyright (c) 2006, 2011 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 704 unchanged lines hidden (view full) ---

713 error = falloc(td, &fp, &fd, O_CLOEXEC);
714 if (error)
715 return (error);
716
717 /* A SHM_ANON path pointer creates an anonymous object. */
718 if (uap->path == SHM_ANON) {
719 /* A read-only anonymous object is pointless. */
720 if ((uap->flags & O_ACCMODE) == O_RDONLY) {
1/*-
2 * Copyright (c) 2006, 2011 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 704 unchanged lines hidden (view full) ---

713 error = falloc(td, &fp, &fd, O_CLOEXEC);
714 if (error)
715 return (error);
716
717 /* A SHM_ANON path pointer creates an anonymous object. */
718 if (uap->path == SHM_ANON) {
719 /* A read-only anonymous object is pointless. */
720 if ((uap->flags & O_ACCMODE) == O_RDONLY) {
721 fdclose(fdp, fp, fd, td);
721 fdclose(td, fp, fd);
722 fdrop(fp, td);
723 return (EINVAL);
724 }
725 shmfd = shm_alloc(td->td_ucred, cmode);
726 } else {
727 path = malloc(MAXPATHLEN, M_SHMFD, M_WAITOK);
728 error = copyinstr(uap->path, path, MAXPATHLEN, NULL);
729#ifdef KTRACE
730 if (error == 0 && KTRPOINT(curthread, KTR_NAMEI))
731 ktrnamei(path);
732#endif
733 /* Require paths to start with a '/' character. */
734 if (error == 0 && path[0] != '/')
735 error = EINVAL;
736 if (error) {
722 fdrop(fp, td);
723 return (EINVAL);
724 }
725 shmfd = shm_alloc(td->td_ucred, cmode);
726 } else {
727 path = malloc(MAXPATHLEN, M_SHMFD, M_WAITOK);
728 error = copyinstr(uap->path, path, MAXPATHLEN, NULL);
729#ifdef KTRACE
730 if (error == 0 && KTRPOINT(curthread, KTR_NAMEI))
731 ktrnamei(path);
732#endif
733 /* Require paths to start with a '/' character. */
734 if (error == 0 && path[0] != '/')
735 error = EINVAL;
736 if (error) {
737 fdclose(fdp, fp, fd, td);
737 fdclose(td, fp, fd);
738 fdrop(fp, td);
739 free(path, M_SHMFD);
740 return (error);
741 }
742
743 fnv = fnv_32_str(path, FNV1_32_INIT);
744 sx_xlock(&shm_dict_lock);
745 shmfd = shm_lookup(path, fnv);

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795 shm_dotruncate(shmfd, 0);
796 }
797 if (error == 0)
798 shm_hold(shmfd);
799 }
800 sx_xunlock(&shm_dict_lock);
801
802 if (error) {
738 fdrop(fp, td);
739 free(path, M_SHMFD);
740 return (error);
741 }
742
743 fnv = fnv_32_str(path, FNV1_32_INIT);
744 sx_xlock(&shm_dict_lock);
745 shmfd = shm_lookup(path, fnv);

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795 shm_dotruncate(shmfd, 0);
796 }
797 if (error == 0)
798 shm_hold(shmfd);
799 }
800 sx_xunlock(&shm_dict_lock);
801
802 if (error) {
803 fdclose(fdp, fp, fd, td);
803 fdclose(td, fp, fd);
804 fdrop(fp, td);
805 return (error);
806 }
807 }
808
809 finit(fp, FFLAGS(uap->flags & O_ACCMODE), DTYPE_SHM, shmfd, &shm_ops);
810
811 td->td_retval[0] = fd;

--- 238 unchanged lines hidden --- 		804 fdrop(fp, td);
805 return (error);
806 }
807 }
808
809 finit(fp, FFLAGS(uap->flags & O_ACCMODE), DTYPE_SHM, shmfd, &shm_ops);
810
811 td->td_retval[0] = fd;

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