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Linux Error Number


Macro: int EILSEQ While decoding a multibyte character the function came along an invalid or an incomplete sequence of bytes or the given wide character is invalid. POSIX.1-2001 permits strerror() to set errno if the call encounters an error, but does not specify what value should be returned as the function result in the event of an error. The perror function is infinitely useful when dealing with errno (but sadly renders the point of this huge table mute). O_CREAT flag is to create a file, if the file does not exist. my review here

On some systems, strerror() returns NULL if the error number is unknown. RETURN VALUE top The strerror(), strerror_l(), and the GNU-specific strerror_r() functions return the appropriate error description string, or an "Unknown error nnn" message if the error number This error can happen in a few different situations: An operation that would block was attempted on an object that has non-blocking mode selected. Looking up error codes manually is ill advise IMO. http://www.thegeekstuff.com/2010/10/linux-error-codes/

Linux Errno Example

Macro: int EMFILE The current process has too many files open and can’t open any more. The XSI-compliant strerror_r() function returns 0 on success. See Socket Options.

ERRORS top EINVAL The value of errnum is not a valid error number. You can use select to find out when the operation will be possible; see Waiting for I/O. The largest message number provided in the table is sys_nerr-1. Errno.h Windows Macro: int ENOLCK No locks available.

Macro: int ELOOP Too many levels of symbolic links were encountered in looking up a file name. Posix Error Codes errno is defined by the ISO C standard to be a modifiable lvalue of type int, and must not be explicitly declared; errno may be a macro. In C programming language, there is an external variable called "errno". their explanation Macro: int EALREADY An operation is already in progress on an object that has non-blocking mode selected.

Macro: int EDQUOT The user’s disk quota was exceeded. Errno.h In C Macro: int ENOTDIR A file that isn’t a directory was specified when a directory is required. Macro: int EGREGIOUS You did what? Conforming To The function perror() and the external errno (see errno(3)) conform to C89, C99, 4.3BSD, POSIX.1-2001.

Posix Error Codes

Macro: int EIO Input/output error; usually used for physical read or write errors. http://man7.org/linux/man-pages/man3/strerror.3.html Macro: int EDEADLK Deadlock avoided; allocating a system resource would have resulted in a deadlock situation. Linux Errno Example ATTRIBUTES top For an explanation of the terms used in this section, see attributes(7). ┌───────────────┬───────────────┬─────────────────────────┐ │Interface │ Attribute │ Value │ ├───────────────┼───────────────┼─────────────────────────┤ │strerror() │ Thread safety │ Linux Errno To String The following error codes are defined by the Linux/i386 kernel.

Macro: int EINTR Interrupted function call; an asynchronous signal occurred and prevented completion of the call. this page It indicates that the shortage is expected to pass, so your program can try the call again later and it may succeed. However, on (very) old UNIX systems, there may be no and the declaration is needed. If the entire function is not available at all in the implementation, it returns ENOSYS instead. Errno.h Linux Kernel

EINVAL Invalid argument (POSIX.1) EIO Input/output error (POSIX.1) EISCONN Socket is connected (POSIX.1) EISDIR Is a directory (POSIX.1) EISNAM Is a named type file EKEYEXPIRED Key has expired EKEYREJECTED Key was This error means you got lucky and the system noticed; it might just hang. The following table shows list of error numbers and its descriptions in Linux operation system ERROR CODE TABLE Error number Error Code Error Description 1 EPERM Operation not permitted 2 ENOENT get redirected here The behavior of strerror_l() is undefined if locale is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle.

The use of sys_errlist[] is nowadays deprecated. Efault In next execution, it throws an error number 17, which is "File already exist". In BSD and GNU, the number of open files is controlled by a resource limit that can usually be increased.

Some of these are marked POSIX.1, indicating that the name is defined by POSIX.1-2001, or C99, indicating that the name is defined by C99.

You get this error when you try to transmit data over a socket, without first specifying a destination for the data. When you are running some program on Linux environment, you might notice that it gives some error number. DESCRIPTION top The strerror() function returns a pointer to a string that describes the error code passed in the argument errnum, possibly using the LC_MESSAGES part of Ebadf Macro: int EROFS An attempt was made to modify something on a read-only file system.

To understand the nature of the error these codes need to be interpreted. If the value of errno should be preserved across a library call, it must be saved: if (somecall() == -1) { int errsv = errno; printf("somecall() failed\n"); if (errsv == ...) Inside a C program, when a function fails, you should handle the errors accordingly, or at least record the errors in a log file. http://softacoustik.com/linux-errno/linux-error-104.php You have to detect the failure and handle the error.

Link bubrek November 3, 2010, 11:46 am i have to make stronge grip on C++ please help me by sending handout/notes and practices Link Cancel reply Leave a Comment Name Email On error, a (positive) error number is returned (since glibc 2.13), or -1 is returned and errno is set to indicate the error (glibc versions before 2.13). C libraries in many older Unix systems have EWOULDBLOCK as a separate error code. Macro: int EHOSTUNREACH The remote host for a requested network connection is not reachable.

This often indicates a cycle of symbolic links. perror function prints error description in standard error. See Connecting. Macro: int EMSGSIZE The size of a message sent on a socket was larger than the supported maximum size.

Every library function that returns this error code also generates a SIGPIPE signal; this signal terminates the program if not handled or blocked. Follow us on Google+ Follow us on Twitter Become a fan on Facebook Support Us Support this blog by purchasing one of my ebooks. Macro: int ERANGE Range error; used by mathematical functions when the result value is not representable because of overflow or underflow. The system does not guarantee that it will notice all such situations.

If no feature test macros are explicitly defined, then (since glibc 2.4) _POSIX_SOURCE is defined by default with the value 200112L, so that the XSI-compliant version of strerror_r() is provided by All rights reserved | Terms of Service man7.org > Linux > man-pages Linux/UNIX system programming training NAME | SYNOPSIS | DESCRIPTION | NOTES | SEEALSO | COLOPHON ERRNO(3) Linux Programmer's Manual It is probably a good idea to delay for a few seconds before trying it again, to allow time for other processes to release scarce resources. All of them expand into integer constant values.