Date: Tue, 23 Jun 2009 17:44:55 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-other@freebsd.org Subject: svn commit: r194744 - in stable/4/lib/libc: . gen Message-ID: <200906231744.n5NHit0f084841@svn.freebsd.org>
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Author: jhb Date: Tue Jun 23 17:44:55 2009 New Revision: 194744 URL: http://svn.freebsd.org/changeset/base/194744 Log: MF7: If the running kernel has support for shm_open() and shm_unlink() as system calls (i.e. 8.0+), then invoke the system calls instead of using open/fcntl/unlink. Modified: stable/4/lib/libc/ (props changed) stable/4/lib/libc/gen/posixshm.c Modified: stable/4/lib/libc/gen/posixshm.c ============================================================================== --- stable/4/lib/libc/gen/posixshm.c Tue Jun 23 17:42:06 2009 (r194743) +++ stable/4/lib/libc/gen/posixshm.c Tue Jun 23 17:44:55 2009 (r194744) @@ -37,12 +37,34 @@ #include <errno.h> #include <unistd.h> +static int _shm_in_kernel = -1; + +/* Wrappers for POSIX SHM system calls in newer kernels. */ +static __inline int +_shm_open(const char *path, int flags, mode_t mode) +{ + + return (syscall(482, path, flags, mode)); +} + +static __inline int +_shm_unlink(const char *path) +{ + + return (syscall(483, path)); +} + int shm_open(const char *path, int flags, mode_t mode) { int fd; struct stat stab; + if (_shm_in_kernel == -1) + _shm_in_kernel = feature_present("posix_shm"); + if (_shm_in_kernel == 1) + return (_shm_open(path, flags, mode)); + if ((flags & O_ACCMODE) == O_WRONLY) return (EINVAL); @@ -65,5 +87,11 @@ shm_open(const char *path, int flags, mo int shm_unlink(const char *path) { + + if (_shm_in_kernel == -1) + _shm_in_kernel = feature_present("posix_shm"); + if (_shm_in_kernel == 1) + return (_shm_unlink(path)); + return (unlink(path)); }
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