shithub: mc

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Add std.pread/std.pwrite

	All the systems have it, and it's useful -- why not?

--- a/lib/std/syswrap+plan9.myr

+++ b/lib/std/syswrap+plan9.myr

@@ -42,7 +42,9 @@

 	const openmode	: (path : byte[:], opts : fdopt, mode : int64 -> result(fd, errno))

 	const close	: (fd : fd -> errno)

 	const read	: (fd : fd, buf : byte[:] -> result(size, errno))

+	const pread	: (fd : fd, buf : byte[:], off : off -> result(size, errno))

 	const write	: (fd : fd, buf : byte[:] -> result(size, errno))

+	const pwrite	: (fd : fd, buf : byte[:], off : off -> result(size, errno))

 	const seek	: (fd : fd, delta : off, whence : whence -> result(off, errno))

 	const pipe	: (fds : fd[2]# -> errno)

 	const dup2	: (ofd : fd, nfd : fd -> result(fd, errno))

@@ -184,7 +186,9 @@

 const close	= {fd;		-> (sys.close((fd : sys.fd)) : errno)}

 const read	= {fd, buf;	-> check(sys.pread((fd : sys.fd), buf, -1))}

+const pread	= {fd, buf,off;	-> check(sys.pread((fd : sys.fd), buf, (off : sys.off)))}

 const write	= {fd, buf;	-> check(sys.pwrite((fd : sys.fd), buf, -1))}

+const pwrite	= {fd, buf,off;	-> check(sys.pwrite((fd : sys.fd), buf, (off : sys.off)))}

 const seek	= {fd, off, whence; 	-> check(sys.seek((fd : sys.fd), (off : sys.off), (whence : int64)))}

 const pipe	= {fds;		-> (sys.pipe((fds : sys.fd[2]#)) : errno)}

 const dup2	= {ofd, nfd;	-> check(sys.dup((ofd : sys.fd), (nfd : sys.fd)))}

--- a/lib/std/syswrap+posixy.myr

+++ b/lib/std/syswrap+posixy.myr

@@ -38,7 +38,9 @@

 	const close	: (fd : fd -> errno)

 	const creat	: (path : byte[:], mode : int64 -> result(fd, errno))

 	const read	: (fd : fd, buf : byte[:] -> result(size, errno))

+	const pread	: (fd : fd, buf : byte[:], off : off -> result(size, errno))

 	const write	: (fd : fd, buf : byte[:] -> result(size, errno))

+	const pwrite	: (fd : fd, buf : byte[:], off : off -> result(size, errno))

 	const pipe	: (fds : fd[2]# -> errno)

 	const seek	: (fd : fd, delta : off, whence : whence -> result(off, errno))

 	const dup2	: (ofd : fd, nfd : fd -> result(fd, errno))

@@ -78,7 +80,9 @@

 const creat	= {path, mode;	-> check(sys.creat(path, mode))}

 const read	= {fd, buf;	-> check(sys.read((fd : sys.fd), buf))}

+const pread	= {fd, buf,off;	-> check(sys.pread((fd : sys.fd), buf, (off : sys.off)))}

 const write	= {fd, buf;	-> check(sys.write((fd : sys.fd), buf))}

+const pwrite	= {fd, buf,off;	-> check(sys.pwrite((fd : sys.fd), buf, (off : sys.off)))}

 const pipe	= {fds;		-> (sys.pipe((fds : sys.fd[2]#)) : errno)}

 const seek	= {fd, delta, whence;	-> check(sys.lseek((fd : sys.fd), (delta : sys.off), (whence : sys.whence)))}

 const dup2	= {ofd, nfd;	-> check((sys.dup2((ofd : sys.fd), (nfd : sys.fd)) : fd))}