On Mon, 6 May 2024 23:01:49 +0300
ilya Basin wrote:
> I need your help with troubleshooting an issue with "pv":
> https://codeberg.org/a-j-wood/pv/issues/87
>
> This app uses SIGALRM to interrupt a blocking write to STDOUT and read more
> data into the buffer.
> On Linuxes write() returns 0 after the signal, but on Cygwin even though the
> signal handler is called, the write call does not return, at least when
> writing to a pipe.
What Linux environment you assume? I run the STC below on Debuan GNU/Linux,
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
void handler(int sig)
{
printf("sig=%d\n", sig);
}
int main()
{
int fd[2];
signal(SIGALRM, handler);
pipe(fd);
for (;;) {
int l = write(fd[1], "A", 1);
if (l == 1) {
printf("."); fflush(stdout); /* Normal */
} else {
printf("%d: %s\n", l, strerror(errno)); /* Interrupt */
}
}
}
but,
kill -ALRM <pid of STC>
does not make output /* Interrupt */ line, but only /* Normal */ line.
uname -a:
Linux debian2 6.1.0-21-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1
(2024-05-03) x86_64 GNU/Linux
The behaviour is same with cygwin.
--
Takashi Yano <takashi.y...@nifty.ne.jp>
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