Posix File Error Codes
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in the future... /usr/include/asm-generic/errno-base.h #ifndef _ASM_GENERIC_ERRNO_BASE_H #define _ASM_GENERIC_ERRNO_BASE_H #define EPERM 1 /* Operation not permitted */ #define ENOENT 2 /* No such file or errno codes directory */ #define ESRCH 3 /* No such process */ #define EINTR 4 posix error codes /* Interrupted system call */ #define EIO 5 /* I/O error */ #define ENXIO 6 /* No such device or
Linux Errno Example
address */ #define E2BIG 7 /* Argument list too long */ #define ENOEXEC 8 /* Exec format error */ #define EBADF 9 /* Bad file number */ #define ECHILD 10 /* No
How To Use Errno
child processes */ #define EAGAIN 11 /* Try again */ #define ENOMEM 12 /* Out of memory */ #define EACCES 13 /* Permission denied */ #define EFAULT 14 /* Bad address */ #define ENOTBLK 15 /* Block device required */ #define EBUSY 16 /* Device or resource busy */ #define EEXIST 17 /* File exists */ #define EXDEV 18 /* Cross-device link */ #define ENODEV 19 errno.h in c /* No such device */ #define ENOTDIR 20 /* Not a directory */ #define EISDIR 21 /* Is a directory */ #define EINVAL 22 /* Invalid argument */ #define ENFILE 23 /* File table overflow */ #define EMFILE 24 /* Too many open files */ #define ENOTTY 25 /* Not a typewriter */ #define ETXTBSY 26 /* Text file busy */ #define EFBIG 27 /* File too large */ #define ENOSPC 28 /* No space left on device */ #define ESPIPE 29 /* Illegal seek */ #define EROFS 30 /* Read-only file system */ #define EMLINK 31 /* Too many links */ #define EPIPE 32 /* Broken pipe */ #define EDOM 33 /* Math argument out of domain of func */ #define ERANGE 34 /* Math result not representable */ #endif /usr/include/asm-generic/errno.h #ifndef _ASM_GENERIC_ERRNO_H #define _ASM_GENERIC_ERRNO_H #include
In C programming language, there is no direct support for error handling. You have to detect the failure and handle the error. In C programming language, return values represents success or failure. Inside a C program, when a function fails,
Strerror
you should handle the errors accordingly, or at least record the errors in a log errno c++ file. When you are running some program on Linux environment, you might notice that it gives some error number. For example, "Error no is errno to string : 17", which doesn't really say much. You really need to know what error number 17 means. This article shows all available error numbers along with it descriptions. This article might be a handy reference for you, when you http://www.virtsync.com/c-error-codes-include-errno encounter an error number and you would like to know what it means. In C programming language, there is an external variable called "errno". From this errno variable you can use some error handling functions to find out the error description and handle it appropriately. You have to include errno.h header file to use external variable errno. perror function prints error description in standard error. The strerror function returns a string describing the error code passed in the argument http://www.thegeekstuff.com/2010/10/linux-error-codes errnum. The following C code snippet tries to open a file through open system call. There are two flags in the open call. O_CREAT flag is to create a file, if the file does not exist. O_EXCL flag is used with O_CREAT, if the file is already exist open call will fail with the proper error number. $ cat fileopen.c #include
found (1 meaning all). See also the http://www.ioplex.com/~miallen/errcmp.html Popular Errno Codes by Platform page which displays only errno http://www.gnu.org/s/libc/manual/html_node/Error-Codes.html identifiers that are found on all systems (excluding MS Windows). SUSv3 AIX 4.3,5.1 HP-UX 11.22 Solaris 9,10 Linux 2.4.28,2.6.9 IRIX 6.5[4] OSF1 FreeBSD 5.2.1 OSX 10.3.8 MSVC6 EPERM10Operation not permitted.1Operation not permitted1Not super-user1Not super-user1Operation not permitted1Operation not permitted1Not error codes owner1Operation not permitted1Operation not permitted1Operation not permitted ENOENT10No such file or directory.2No such file or directory2No such file or directory2No such file or directory2No such file or directory2No such file or directory2No such file or directory2No such file or directory2No such file or directory2No such file or directory posix file error ESRCH10No such process.3No such process3No such process3No such process3No such process3No such process3No such process3No such process3No such process3No such process EINTR10Interrupted function.4interrupted system call4interrupted system call4interrupted system call4Interrupted system call4Interrupted function call4Interrupted system call4Interrupted system call4Interrupted system call4Interrupted function call EIO10I/O error.5I/O error5I/O error5I/O error5I/O error5I/O error5I/O error5Input/output error5Input/output error5Input/output error ENXIO10No such device or address.6No such device or address6No such device or address6No such device or address6No such device or address6No such device or address6No such device or address6Device not configured6Device not configured6No such device or address E2BIG10Argument list too long.7Arg list too long7Arg list too long7Arg list too long7Arg list too long7Arg list too long7Arg list too long7Argument list too long7Argument list too long7Arg list too long ENOEXEC10Executable file format error.8Exec format error8Exec format error8Exec format error8Exec format error8Exec format error8Exec format error8Exec format error8Exec format error8Exec format error EBADF1
codes can’t occur on GNU systems, but they can occur using the GNU C Library on other systems. Macro: int EPERM Operation not permitted; only the owner of the file (or other resource) or processes with special privileges can perform the operation. Macro: int ENOENT No such file or directory. This is a “file doesn’t exist” error for ordinary files that are referenced in contexts where they are expected to already exist. Macro: int ESRCH No process matches the specified process ID. Macro: int EINTR Interrupted function call; an asynchronous signal occurred and prevented completion of the call. When this happens, you should try the call again. You can choose to have functions resume after a signal that is handled, rather than failing with EINTR; see Interrupted Primitives. Macro: int EIO Input/output error; usually used for physical read or write errors. Macro: int ENXIO No such device or address. The system tried to use the device represented by a file you specified, and it couldn’t find the device. This can mean that the device file was installed incorrectly, or that the physical device is missing or not correctly attached to the computer. Macro: int E2BIG Argument list too long; used when the arguments passed to a new program being executed with one of the exec functions (see Executing a File) occupy too much memory space. This condition never arises on GNU/Hurd systems. Macro: int ENOEXEC Invalid executable file format. This condition is detected by the exec functions; see Executing a File. Macro: int EBADF Bad file descriptor; for example, I/O on a descriptor that has been closed or reading from a descriptor open only for writing (or vice versa). Macro: int ECHILD There are no child processes. This error happens on operations that are supposed to manipulate child processes, when there aren’t any processes to manipulate. Macro: int EDEADLK Deadlock avoided; allocating a system resource would have resulted in a deadlock situation. The system does not guarantee that it will notice all such situations. This error means you got lucky and the system noticed; it might just hang. See File Locks, for an example. Macro: int ENOMEM No memory available. The system cannot allocate more virtual memory because its capacity is full. Macro: int EACCES Permission denied; the file permissions do not allow the attempted operation. Macro: int E