29 lines
555 B
C
29 lines
555 B
C
#include <unistd.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include "syscall.h"
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int ttyname_r(int fd, char *name, size_t size)
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{
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struct stat st1, st2;
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char procname[sizeof "/proc/self/fd/" + 3*sizeof(int) + 2];
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ssize_t l;
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if (!isatty(fd)) return errno;
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__procfdname(procname, fd);
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l = readlink(procname, name, size);
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if (l < 0) return errno;
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else if (l == size) return ERANGE;
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name[l] = 0;
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if (stat(name, &st1) || fstat(fd, &st2))
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return errno;
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if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
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return ENODEV;
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return 0;
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}
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