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graphic: 0.900
instruction: 0.878
device: 0.834
semantic: 0.599
vnc: 0.531
network: 0.513
socket: 0.452
mistranslation: 0.340
boot: 0.319
other: 0.247
KVM: 0.093
assembly: 0.073
EOF is not detected, when semihosting is reading from stdin
Description of problem:
QEMU hangs.
Steps to reproduce:
1. Run the program with stdin from a pipe.
Additional information:
The code is compiled from this source:
```
#include <stdio.h>
int main(int argc, char** argv) {
int i = -1;
int result = scanf("%d", &i);
printf("result = %d, i = %d\n", result, i);
return 0;
}
```
compiled with GCC and picolibc:
```
arm-none-eabi-gcc --specs=picolibc.specs -march=armv7-m ~/sources/picolibc/git/test-stdin.c -o test-stdin -lc -lsemihost --crt0=hosted -O0 -g
```
[test-stdin](/uploads/dbd2650c8e0aaca353fd7630ac9c8440/test-stdin)
The execution hangs at semihosting SYS_READC(0x7) call:
```
movs r0, #7
(...)
bkpt #0xab
```
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