add cancellation for read, write, close

close.c: add function __close_nocancel_no_status to be used internally
in libc avoiding inlining it everywhere.

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

include/unistd.h

@@ -354,7 +354,11 @@ libc_hidden_proto(lseek64)
    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern int close (int __fd);
+#ifdef _LIBC
+extern __typeof(close) __close_nocancel attribute_hidden;
+extern void __close_nocancel_no_status(int) attribute_hidden;
 libc_hidden_proto(close)
+#endif
 
 /* Read NBYTES into BUF from FD.  Return the
    number read, -1 for errors or 0 for EOF.
@@ -362,14 +366,20 @@ libc_hidden_proto(close)
    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur;
+#ifdef _LIBC
+extern __typeof(read) __read_nocancel attribute_hidden;
 libc_hidden_proto(read)
+#endif
 
 /* Write N bytes of BUF to FD.  Return the number written, or -1.
 
    This function is a cancellation point and therefore not marked with
    __THROW.  */
 extern ssize_t write (int __fd, __const void *__buf, size_t __n) __wur;
+#ifdef _LIBC
+extern __typeof(write) __write_nocancel attribute_hidden;
 libc_hidden_proto(write)
+#endif
 
 #ifdef __USE_UNIX98
 # ifndef __USE_FILE_OFFSET64

libc/sysdeps/linux/common/close.c

@@ -9,12 +9,13 @@
 
 #include <sys/syscall.h>
 #include <unistd.h>
+#include <cancel.h>
 
-_syscall1(int, close, int, fd)
+#define __NR___close_nocancel __NR_close
+_syscall1(int, __NC(close), int, fd)
 
-#ifndef __LINUXTHREADS_OLD__
-libc_hidden_def(close)
-#else
-libc_hidden_weak(close)
-strong_alias(close,__libc_close)
-#endif
+#define __NR___close_nocancel_no_status __NR_close
+_syscall_noerr1(void, __close_nocancel_no_status, int, fd)
+
+CANCELLABLE_SYSCALL(int, close, (int fd), (fd))
+lt_libc_hidden(close)

libc/sysdeps/linux/common/read.c

@@ -9,11 +9,11 @@
 
 #include <sys/syscall.h>
 #include <unistd.h>
+#include <cancel.h>
 
-_syscall3(ssize_t, read, int, fd, __ptr_t, buf, size_t, count)
-#ifndef __LINUXTHREADS_OLD__
-libc_hidden_def(read)
-#else
-libc_hidden_weak(read)
-strong_alias(read,__libc_read)
-#endif
+#define __NR___read_nocancel __NR_read
+_syscall3(ssize_t, __NC(read), int, fd, void *, buf, size_t, count)
+
+CANCELLABLE_SYSCALL(ssize_t, read, (int fd, void *buf, size_t count),
+		    (fd, buf, count))
+lt_libc_hidden(read)

libc/sysdeps/linux/common/write.c

@@ -9,17 +9,11 @@
 
 #include <sys/syscall.h>
 #include <unistd.h>
+#include <cancel.h>
 
-_syscall3(ssize_t, write, int, fd, const __ptr_t, buf, size_t, count)
-#ifndef __LINUXTHREADS_OLD__
-libc_hidden_def(write)
-#else
-libc_hidden_weak(write)
-strong_alias(write,__libc_write)
-#endif
+#define __NR___write_nocancel __NR_write
+_syscall3(ssize_t, __NC(write), int, fd, const void *, buf, size_t, count)
 
-#if 0
-/* Stupid libgcc.a from gcc 2.95.x uses __write in pure.o
- * which is a blatant GNU libc-ism... */
-strong_alias(write,__write)
-#endif
+CANCELLABLE_SYSCALL(ssize_t, write, (int fd, const void *buf, size_t count),
+		    (fd, buf, count))
+lt_libc_hidden(write)