55 lines
1.4 KiB
Plaintext
55 lines
1.4 KiB
Plaintext
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#! /bin/bash
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# Work around issue with parallel make output causing random error, as in
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# make[1]: write error: stdout
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# Probably due to a kernel bug:
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# https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/1814393
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# Seems to affect image ubuntu-1604:201903-01 and ubuntu-1604:202004-01
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cd "$(dirname $0)"
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if [ ! -x cat_ignore_eagain.out ]; then
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cc -x c -o cat_ignore_eagain.out - << EOF
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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int main() {
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int n, m, p;
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char buf[1024];
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for (;;) {
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n = read(STDIN_FILENO, buf, 1024);
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if (n > 0 && n <= 1024) {
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for (m = 0; m < n;) {
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p = write(STDOUT_FILENO, buf + m, n - m);
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if (p < 0) {
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if (errno == EAGAIN) {
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// ignore but pause a bit
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usleep(100);
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} else {
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perror("write failed");
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return 42;
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}
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} else {
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m += p;
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}
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}
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} else if (n < 0) {
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if (errno == EAGAIN) {
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// ignore but pause a bit
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usleep(100);
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} else {
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// Some non-ignorable error
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perror("read failed");
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return 43;
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}
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} else {
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// EOF
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return 0;
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}
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}
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}
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EOF
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fi
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exec ./cat_ignore_eagain.out
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