The setlabel() function defines the label for messages produced in standard format by subsequent calls to lfmt(3C) and pfmt(3C).

The label argument is a character string no more than 25 characters in length.

No label is defined before setlabel() is called. The label should be set once at the beginning of a utility and remain constant. A null pointer or an empty string passed as argument will reset the definition of the label.

Upon successful completion, setlabel() returns 0; otherwise, it returns a non-zero value.

The following code (without previous call to setlabel()):

pfmt(stderr, MM_ERROR, "test:2:Cannot open file\n"); setlabel("UX:test"); pfmt(stderr, MM_ERROR, "test:2:Cannot open file\n");

will produce the following output:

ERROR: Cannot open file UX:test: ERROR: Cannot open file

See attributes(5) for descriptions of the following attributes:

getopt(3C), lfmt(3C), pfmt(3C), attributes(5)