Handle readlink errors (#1292)
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@ -36,8 +36,9 @@ static void get_exe_filename(char *buf, int sz) {
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buf[len] = '\0';
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#elif __linux__
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char path[] = "/proc/self/exe";
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int len = readlink(path, buf, sz - 1);
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buf[len] = '\0';
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ssize_t len = readlink(path, buf, sz - 1);
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if (len > 0)
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buf[len] = '\0';
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#elif __APPLE__
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/* use realpath to resolve a symlink if the process was launched from one.
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** This happens when Homebrew installs a cack and creates a symlink in
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