io API's should handle interrupts (eg EINTR) / short reads properly

[timotheecour]

• io API's should handle interrupts / short reads properly
• io API's need to use try/finally or defer, for correctness (and defer often leads to much simpler code, eg see Make 'echo' raise IOErrors when appropriate nim-lang/Nim#16367 (comment) )

• Make 'echo' raise IOErrors when appropriate nim-lang/Nim#16367 (comment)
• io.endOfFile is buggy · Issue #16011 · nim-lang/Nim
• improvements to sameFileContent; supersedes #16008 by timotheecour · Pull Request #16094 · nim-lang/Nim

signals / errors

• EINTR (eg: fix #9634 don't crash on execCmdEx/readLine when inside gdb/lldb (handle EINTR) nim-lang/Nim#13232)

• 35 EAGAIN Resource temporarily unavailable. This is a temporary condition and later calls to the same routine may complete normally.
  (as observed in echo may silently fail to write to stdout nim-lang/Nim#16366)

• etc see also man 2 intro for all error codes

links

• c - Are interrupt signals dispatched during fread() and fwrite() library calls? - Stack Overflow

• fix #16011 endOfFile by timotheecour · Pull Request #16013 · nim-lang/Nim

• Linked TITLE: deprecate io.getFileSize, fix os.getFileSize by timotheecour · Pull Request #16095 · nim-lang/Nim

• even this seems incorrect wrt short reads / exceptions: Milestone TITLE: Do not read the whole file to compute SHA1 hash (fixes 15997) by irdassis · Pull Request #16006 · nim-lang/Nim

• fix #9634 don't crash on execCmdEx/readLine when inside gdb/lldb by timotheecour · Pull Request #13232 · nim-lang/Nim

• POSIX, Part 1: Error handling · angrave/SystemProgramming Wiki

• fix #9634 don't crash on execCmdEx/readLine when inside gdb/lldb by timotheecour · Pull Request #13232 · nim-lang/Nim