io: handle data_size of -1 as unlimited data in print_iovec

[strace] / README

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 This is strace, a system call tracer for Linux.
 
 strace is released under a Berkeley-style license at the request
-of Paul Kranenburg; see the file COPYRIGHT for details.
+of Paul Kranenburg.
 
 See the file CREDITS for a list of authors and other contributors.
-
 See the file INSTALL for compilation and installation instructions.
+See the file NEWS for information on what has changed in recent versions.
 
-See the file NEWS for information on what has changed in recent
-versions.
+The project's homepage is at
+       https://sourceforge.net/projects/strace/
 
-You can get the latest version of strace from its homepage at
-http://sourceforge.net/projects/strace/ .
+strace has a mailing list:
+       strace-devel@lists.sourceforge.net.
 
-Please send bug reports and enhancements to the strace
-mailinglist at strace-devel@lists.sourceforge.net.
+System requirements:
+       * Linux kernel >= 2.6.18 is recommended.  Older versions might still work
+         but they haven't been thoroughly tested with this release.
+       * Linux kernel >= 2.5.46 is required.
+         Older versions without a decent PTRACE_SETOPTIONS support will not work.
+       * On mips, linux kernel >= 2.6.15 is required.
+         Older versions without a decent PTRACE_GETREGS support will not work.
+       * On s390 and s390x, linux kernel >= 2.6.27 is required.
+         Older versions without a decent PTRACE_GETREGSET support will not work.