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OpenSolaris 2009.06 - man page for setlabel (opensolaris section 3c)

setlabel(3C)						   Standard C Library Functions 					      setlabel(3C)

setlabel - define the label for pfmt() and lfmt()
#include <pfmt..h> int setlabel(const char *label);
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: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+
getopt(3C), lfmt(3C), pfmt(3C), attributes(5) SunOS 5.11 29 Dec 1996 setlabel(3C)