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75a9c186a941896f90dd0985fe4b1fe86d351f54
[musl]
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isatty.c
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#include <unistd.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include "syscall.h"
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int isatty(int fd)
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{
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struct winsize wsz;
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unsigned long r = syscall(SYS_ioctl, fd, TIOCGWINSZ, &wsz);
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if (r == 0) return 1;
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if (errno != EBADF) errno = ENOTTY;
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return 0;
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}