Edom - translation to french
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Edom - translation to french

C STANDARD LIBRARY HEADER
ENOBUFS; Errno; Error codes in Linux; EDOM; ERANGE; EILSEQ; EPIPE; Cerrno

Edom      
Edom, geographical region southwest of the Dead Sea; ancient kingdom of the Edomites located in this region
Edomites      
Edomite, descendant of Esau or Edom (Biblical)
Esaü      
n. Esau, Edom, firstborn son of Isaac and Rebekah who sold his birthright to his brother Jacob (Biblical)

Definition

Edomite
·noun One of the descendants of Esau or Edom, the brother of Jacob; an Idumean.

Wikipedia

Errno.h

errno.h is a header file in the standard library of the C programming language. It defines macros for reporting and retrieving error conditions using the symbol errno (short for "error number").

errno acts like an integer variable. A value (the error number) is stored in errno by certain library functions when they detect errors. At program startup, the value stored is zero. Library functions store only values greater than zero. Any library function can alter the value stored before return, whether or not they detect errors. Most functions indicate that they detected an error by returning a special value, typically NULL for functions that return pointers, and -1 for functions that return integers. A few functions require the caller to preset errno to zero and test it afterwards to see if an error was detected.

The errno macro expands to an lvalue with type int, sometimes with the extern and/or volatile type specifiers depending upon the platform. Originally this was a static memory location, but macros are almost always used today to allow for multi-threading, so that each thread will see its own thread-local error number.

The header file also defines macros that expand to integer constants that represent the error codes. The C standard library only requires three to be defined:

EDOM

Results from a parameter outside a function's domain, e.g. sqrt(-1)

ERANGE

Results from a result outside a function's range, e.g. strtol("0xfffffffff", NULL, 0) on systems with a 32-bit wide long

EILSEQ (Required since 1994 Amendment 1 to C89 standard)

Results from an illegal byte sequence, e.g. mbstowcs(buf, "\xff", 1) on systems that use UTF-8.

POSIX compliant operating systems like AIX, Linux or Solaris include many other error values, many of which are used much more often than the above ones, such as EACCES for when a file cannot be opened for reading. C++11 additionally defines many of the same values found within the POSIX specification.

Traditionally, the first page of Unix system manuals, named intro(2), lists all errno.h macros, but this is not the case with Linux, where these macros are instead listed in the errno(3).

An errno can be translated to a descriptive string using strerror (defined in string.h) or a BSD extension called sys_errlist. The translation can be printed directly to the standard error stream using perror (defined in stdio.h). As strerror in many Unix-like systems is not thread-safe, a thread-safe version strerror_r is used, but conflicting definitions from POSIX and GNU makes it even less portable than the sys_errlist table.