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authorUlrich Drepper <drepper@redhat.com>2008-05-03 15:10:37 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-03 16:50:33 -0400
commitd35c7b0e54a596c5a8134d75999b7f391a9c6550 (patch)
tree697bb89dbeccae28eb928b2589f500d747ed38ec /fs
parent2ddcca36c8bcfa251724fe342c8327451988be0d (diff)
unified (weak) sys_pipe implementation
This replaces the duplicated arch-specific versions of "sys_pipe()" with one unified implementation. This removes almost 250 lines of duplicated code. It's marked __weak, so that *if* an architecture wants to override the default implementation it can do so by simply having its own replacement version, since many architectures use alternate calling conventions for the 'pipe()' system call for legacy reasons (ie traditional UNIX implementations often return the two file descriptors in registers) I still haven't changed the cris version even though Linus says the BKL isn't needed. The arch maintainer can easily do it if there are really no obstacles. Signed-off-by: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/pipe.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/pipe.c b/fs/pipe.c
index f73492b6817e..3499f9ff6316 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1076,6 +1076,23 @@ int do_pipe(int *fd)
1076} 1076}
1077 1077
1078/* 1078/*
1079 * sys_pipe() is the normal C calling standard for creating
1080 * a pipe. It's not the way Unix traditionally does this, though.
1081 */
1082asmlinkage long __weak sys_pipe(int __user *fildes)
1083{
1084 int fd[2];
1085 int error;
1086
1087 error = do_pipe(fd);
1088 if (!error) {
1089 if (copy_to_user(fildes, fd, sizeof(fd)))
1090 error = -EFAULT;
1091 }
1092 return error;
1093}
1094
1095/*
1079 * pipefs should _never_ be mounted by userland - too much of security hassle, 1096 * pipefs should _never_ be mounted by userland - too much of security hassle,
1080 * no real gain from having the whole whorehouse mounted. So we don't need 1097 * no real gain from having the whole whorehouse mounted. So we don't need
1081 * any operations on the root directory. However, we need a non-trivial 1098 * any operations on the root directory. However, we need a non-trivial