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The output for this code printed out ‘Success’.
printf("%m\n"); 
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The format specifier is used during input and output. It is a way to tell the compiler what type of data is in a variable during taking input using scanf() or printing using printf().
An unsigned Integer means the variable can hold only a positive value. This format specifier is used within the printf() function for printing the unsigned integer variables. Syntax: printf(“%u”, variable_name);
m conversion specifier is not C but is a GNU extension to printf:
From GNU documentation:
http://www.gnu.org/software/libc/manual/html_node/Other-Output-Conversions.html
The ‘%m’ conversion prints the string corresponding to the error code in errno. See Error Messages. Thus:
fprintf (stderr, "can't open `%s': %m\n", filename);is equivalent to:
fprintf (stderr, "can't open `%s': %s\n", filename, strerror (errno));The ‘%m’ conversion is a GNU C Library extension.
So:
printf("%m\n", d); is equivalent to
printf("%s\n", strerror (errno), d); which is equivalent to
printf("%s\n", strerror (errno)); Note that %mdoes not require an argument. Here printf("%m\n", d) and printf("%s\n", strerror (errno), d) have more arguments than required: with printf if there are extra trailing arguments, they are just evaluated and ignored.
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