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Showing content from http://en.cppreference.com/w/c/numeric/math/../../io/../numeric/math/../../error/errno_macros.html below:

Error numbers - cppreference.com

Each of the macros defined in <errno.h> expands to an integer constant expression with type int and with a unique positive value. The following constants are defined by ISO C. The implementation may define more, as long as they begin with 'E' followed by digits or uppercase letters.

Many additional errno constants are defined by POSIX and by the C++ standard library, and individual implementations may define even more, e.g. errno(3) on Linux or intro(2) on BSD and OS X.

#include <errno.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
 
int main(void)
{
    errno = 0;
    printf("log(-1.0) = %f\n", log(-1.0));
    printf("%s\n\n", strerror(errno));
 
    errno = 0;
    printf("log(0.0)  = %f\n", log(0.0));
    printf("%s\n", strerror(errno));
}

Possible output:

log(-1.0) = nan
Numerical argument out of domain
 
log(0.0)  = -inf
Numerical result out of range

• C23 standard (ISO/IEC 9899:2024):

• 7.5/2 Errors <errno.h> (p: TBD)

• C17 standard (ISO/IEC 9899:2018):

• 7.5/2 Errors <errno.h> (p: TBD)

• C11 standard (ISO/IEC 9899:2011):

• 7.5/2 Errors <errno.h> (p: 205)

• C99 standard (ISO/IEC 9899:1999):

• 7.5/2 Errors <errno.h> (p: 186)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.1.3 Errors <errno.h>

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