* Vineet Gupta:
> Here's a simple test case which shows the problem:
>
> #define _GNU_SOURCE
> #include <stdio.h>
> #include <stdlib.h>
> #include <errno.h>
>
> void main(void)
> {
> const char *this_func = "finite";
> char *test_name;
>
> errno = 0;
> if (asprintf (&test_name, "%s (%s)", this_func, "my-str") == -1)
> abort ();
>
> printf("%d\n", errno); // <-- prints 11
> }
>
> The errno unconditionally being set to EAGAIN seems to have been
> introduced in commit 568ceebf6adfc58c64a95133311268db6 ("Fix
> infinite loop when fopencookie custom write returns 0 on error")
> bakc in 2016.
For functions specified by standards, successful calls can alter errno
unless specified otherwise. asprintf is not a standardized function,
but it is reasonable to expect that a similar rule applies.
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