Date: Tue, 7 Mar 2023 08:18:44 -0500 From: Rich Felker <dalias@...c.org> To: somethingfnothing <somethingfnothing@....com> Cc: "musl@...ts.openwall.com " <musl@...ts.openwall.com> Subject: Re: fputs stdout lost characters on nonblock tty On Tue, Mar 07, 2023 at 08:42:37PM +0800, somethingfnothing wrote: > hi > > > I use fputs to write string to stdout, sometimes it will lost some > characters, the error is EAGAIN, my tty is nonblock. > > > fputs did not handle this error, it reset the "wpos" "wbase" "wend" > and return -1 when recive error, thus the last characters was lost, > and I cannot know how much characters was lost This is the expected behavior. fputs is expected to behave "as if" by repeated fputc, and return an error if any of those fputc operations would have returned an error. fputc in turn is specified to fail with EAGAIN in this case: [EAGAIN] [CX] [Option Start] The O_NONBLOCK flag is set for the file descriptor underlying stream and the thread would be delayed in the write operation. [Option End] https://pubs.opengroup.org/onlinepubs/9699919799/functions/fputc.html Nonblocking file descriptors are generally not useful with stdio. Is there a reason you're setting it to nonblocking mode?
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.