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xsendfile_len() to exit with error if underlying write fails

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cp currently will exit with success even if the underlying
write syscall fails with an error. Fixing this behavior.

Signed-off-by: Utsav Munendra <utsavm@meta.com>
This commit is contained in:
Utsav Munendra 2025-09-05 13:50:36 -07:00 committed by Rob Landley
parent 494f9c4efc
commit 0f5e2f0ace
1 changed files with 2 additions and 2 deletions
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4
lib/xwrap.c
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@ -867,9 +867,9 @@ long long xsendfile_len(int in, int out, long long bytes)
{ {
long long len = sendfile_len(in, out, bytes, 0); long long len = sendfile_len(in, out, bytes, 0);
if (bytes != -1 && bytes != len) { if (len == -1 || (bytes != -1 && bytes != len)) {
if (out == 1 && len<0) xexit(); if (out == 1 && len<0) xexit();
error_exit("short %s", (len<0) ? "write" : "read"); perror_exit("short %s", (len<0) ? "write" : "read");
} }
return len; return len;