llnl / dftracer-utils / 29118766082

53%

Build Type

push

github

Committed by hariharan-devarajan

Commit Message

fix(io): finish scatter-gather writes past IOV_MAX

writev(2) accepts at most IOV_MAX entries and may write fewer bytes than asked.
The streaming HTTP path builds two iovec entries per event, so a chunk over ~511
events overflowed the limit, writev failed, and the connection still sent the
terminating chunk: clients saw 200 OK with an empty body. Bulk export of any
sizeable trace returned nothing.

Add io::writev_all(), which splits runs longer than IOV_MAX and resumes after
short writes, and use it for streamed responses. The limit is read via
sysconf(_SC_IOV_MAX), since glibc gates IOV_MAX behind feature macros and
spells it UIO_MAXIOV; io_uring's IORING_OP_WRITEV is bounded the same way.

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39269 of 96697 branches covered (40.61%)

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26 of 27 new or added lines in 2 files covered. (96.3%)

428 existing lines in 11 files now uncovered.

35017 of 44296 relevant lines covered (79.05%)

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