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Description: ------------ During compile, there're few warnings: =============================== mail-functions.c:56:19: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare] if(bytes_written < 0) { ~~~~~~~~~~~~~ ^ ~ mail-functions.c:80:19: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare] if(bytes_written < 0) { ~~~~~~~~~~~~~ ^ ~ mail-functions.c:112:19: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare] if(bytes_written < 0) { ~~~~~~~~~~~~~ ^ ~ mail-functions.c:138:19: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare] if(bytes_written < 0) { ~~~~~~~~~~~~~ ^ ~ mail-functions.c:272:19: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare] if(bytes_written < 0) ~~~~~~~~~~~~~ ^ ~ mail-functions.c:296:19: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare] if(bytes_written < 0) { ~~~~~~~~~~~~~ ^ ~ mail-functions.c:323:19: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare] if(bytes_written < 0) { ~~~~~~~~~~~~~ ^ ~ 7 warnings generated. ================================