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program test_read_stdin implicit none character*200 line 10 read(*,'(a)', end=20,err=30) line write(0,'(a)') line goto 10 20 write(0,'(a)') 'EOF' stop 30 write(0,'(a)') 'ERROR' stop end program test_read_stdin
Compiling the above simple program with gfortran or ifort 14.0.4.211 I get:
$ ifort test_read_stdin.f -o test_read_stdin $ echo -n "a" | ./test_read_stdin a EOF
as expected.
Instead, compiling with ifort 17.0.4.196 the above command hangs and top shows very high CPU usage:
$ echo -n "a" | ./test_read_stdin ▒ [1]+ Stopped echo -n "a" | ./test_read_stdin $ bg [1]+ echo -n "a" | ./test_read_stdin & $ ps PID TTY TIME CMD 7841 pts/1 00:00:00 bash 19313 pts/1 00:00:02 test_read_stdin 19314 pts/1 00:00:00 ps $ top -p 19313 top - 09:55:42 up 5 days, 56 min, 3 users, load average: 0.80, 0.34, 0.12 Tasks: 1 total, 1 running, 0 sleeping, 0 stopped, 0 zombie Cpu(s): 0.8%us, 4.8%sy, 0.0%ni, 94.3%id, 0.0%wa, 0.1%hi, 0.0%si, 0.0%st Mem: 8058848k total, 6804384k used, 1254464k free, 336976k buffers Swap: 6168572k total, 209088k used, 5959484k free, 5221952k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 19313 build 20 0 14028 1048 684 R 100.0 0.0 0:27.52 test_read_stdin
Is this intentional or is it a bug?
This change in behaviour may break a number of existing programs.
Thanks, kind regards
Paolo
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Thank you for your report! Please submit a bug report via our Online Service Center at https://supporttickets.intel.com/ Our engineering team will investigate this further.
Instructions on how to file a ticket are available here:
https://software.intel.com/en-us/articles/how-to-create-a-support-request-at-online-service-center
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