Am 03.12.2017 21:46, schrieb SF Markus Elfring:

Hello,

I have constructed another demonstration program.

#include <errno.h> #include <stdio.h> #include <stdlib.h>

int main(void) { FILE *f = fopen("/dev/full", "a");

if (!f) goto report_failure;

{ int const c = 'X';

if (fputc(c, f) != c) goto report_failure; }

Your test is broken, you are writing actualy into a buffer. Adding setbuf(f,NULL) to disable buffering will return main: No space left on device

Otherwise force the buffer to be fflush()ed and i it will also report an error.

return EXIT_SUCCESS;

report_failure: perror(__func__);

from perror(3): errno is undefined after a successful library call

so this may or may not return what you expect.

re, wh

return errno; }

I got the following result.

elfring@Sonne:~/Projekte/selftests> gcc-7 putc_into_full_file1.c && ./a.out; echo $? 0

Does such a simple test example need further software development considerations?

Regards, Markus -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html

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