是否有任何不终止/退出程序的 err() 替代方法？

Question

Is there an alternative to the err() family of functions found in <err.h> that displays the program name, a semicolon, a space, and the error message... without exiting the program?

Pseudocode

I want

print "<program name>: <error message>"

and not

print "<program name>: <error message>" exit program return <status>

EDIT: I cannot use argv[0] (as the program name) to write out the message myself, as I am writing a library

Answer 1

See man error .

error is the same as err but will return if status == 0 , exit otherwise.

CONFORMING TO

• These functions and variables are GNU extensions, and should not be used in programs intended to be portable.

Answer 2

program_invocation_name works just as well for getting the name of the program, as Erdal Küçük mentioned. From this, we can print the full error message, program name included.

The variable is part of glibc and can be retrieved using:

extern char *program_invocation_name;

Because it is not a part of the C standard library, programs using this variable should not be expected to be portable.

Answer 3

The warn / warnx functions from err.h will do the same thing as err , but will return.

For example:

warnx("message here");
puts("I'm still running!");

Output:

a.out: message here
I'm still running!