I noticed this when running a program that uses a periodic timer signal. The
sigaction did not set SA_RESTART. During program runs, huge chunks of console
output would disappear.
I sort of tracked this down to the code in libstdc++ that uses fwrite to do the
output of cout and cerr. That is a bit weird, I expected it to be using the
basic_file operations on fd 0 instead.
In summary, it appears to call fwrite and never check the error return, then it
increments the streambuf pointers and loses that whole output block.
--
Summary: std::cout loses whole blocks of output if interrupted by
signal without SA_RESTART
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: zlynx at acm dot org
GCC host triplet: x86_64-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35763
