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sys_read() should return 0 instead of -EIO (Linux behavior) when PTY slave is closed
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src/kernel/emulation/linux/unistd/read.c
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src/kernel/emulation/linux/unistd/read.c
···
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#include "../errno.h"
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#include <linux-syscalls/linux.h>
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#include "../bsdthread/cancelable.h"
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#include "../misc/ioctl.h"
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#include "../duct_errno.h"
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#define LINUX_TCGETA 0x5405
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long sys_read(int fd, void* mem, int len)
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{
···
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ret = LINUX_SYSCALL3(__NR_read, fd, mem, len);
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if (ret < 0)
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{
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// When the slave side of a PTY is closed, Linux produces -EIO on the master side.
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// macOS produces an EOF.
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if (ret == -LINUX_EIO)
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{
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// Not making this static makes everything go boom. Do we have a too small stack somewhere?
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static char dummy[18];
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if (__real_ioctl(fd, LINUX_TCGETA, dummy) == 0) // "isatty(fd)"
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return 0;
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}
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return errno_linux_to_bsd(ret);
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}
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return ret;
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}