Copyright (c) 2001 Christopher G. Demetriou
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<<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
.Dd May 21, 2011 .Dt GETPROGNAME 3 .Os .Sh NAME .Nm getprogname , .Nm setprogname .Nd get/set the name of the current program .Sh LIBRARY .Lb libc .Sh SYNOPSIS n stdlib.h .Ft const char * .Fn getprogname "void" .Ft void .Fn setprogname "const char *name" .Sh DESCRIPTION These utility functions get and set the current program's name as used by various error-reporting functions.
p .Fn getprogname returns the name of the current program. This function is typically useful when generating error messages or other diagnostic output. If the program name has not been set, .Fn getprogname will return .Dv NULL .
p .Fn setprogname sets the name of the current program to be the last pathname component of the .Fa name argument. It should be invoked at the start of the program, using the .Fa argv[0] passed into the program's .Fn main function. A pointer into the string pointed to by the .Fa name argument is kept as the program name. Therefore, the string pointed to by .Fa name should not be modified during the rest of the program's operation.
p A program's name can only be set once, and in .Nx that is actually done by program start-up code that is run before .Fn main is called. Therefore, in .Nx , calling .Fn setprogname explicitly has no effect. However, portable programs that wish to use .Fn getprogname should call .Fn setprogname from .Fn main . On operating systems where .Fn getprogname and .Fn setprogname are implemented via a portability library, this call is needed to make the name available. .Sh SEE ALSO .Xr err 3 , .Xr setproctitle 3 .Sh HISTORY The .Nm getprogname and .Nm setprogname function calls appeared in .Nx 1.6 . .Sh RESTRICTIONS The string returned by .Fn getprogname is supplied by the invoking process and should not be trusted by setuid or setgid programs.