print formatted error messages NAME fmtmsg - print formatted error messages LIBRARY Standard C library ( libc , -lc ) SYNOPSIS #incl......troduce new severity classes LIBRARY Standard C library ( libc , -lc ) SYNOPSIS #include <fmtmsg.h> int addseverity(int severity , const char * s ); Feature Test Macro Requireme…...tl() (for any value of cmd argument) fflush() fgetc() fgetpos() fgets() fgetwc() fgetws() fmtmsg() fopen() fpathconf() fprintf() fputc() fputs() fputwc() fputws() fread() freope…