5db312a1c0
The existing code allocated 2 bytes (char*), but gtty() needs 6 bytes (struct sgttyb), so isatty() smashed the stack and corrupted its return address, probably causing SIGBUS or SIGSEGV. Fix by switching to TIOCGETD, which needs 2 bytes. TIOCGETD isn't in the manual for tty(4), but does appear in https://minnie.tuhs.org//cgi-bin/utree.pl?file=V7/usr/sys/dev/tty.c This fixes hilo_c.pdpv7 and hilo_mod.pdpv7 in simh-pdp11.
8 lines
125 B
C
8 lines
125 B
C
int isatty(int fd)
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{
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unsigned u;
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if (ioctl(fd, /*TIOCGETD*/(('t'<<8)|0), &u) < 0)
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return 0;
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return 1;
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}
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