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RedHat 9 (Linux i386) - man page for errno (redhat section 3)

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ERRNO(3)				Library functions				 ERRNO(3)

       errno - number of last error

       #include <errno.h>

       extern int errno;

       The  integer  errno  is	set by system calls (and some library functions) to indicate what
       went wrong.  Its value is significant only when the call returned an error  (usually  -1),
       and a library function that does succeed is allowed to change errno.

       Sometimes,  when  -1 is also a legal return value one has to zero errno before the call in
       order to detect possible errors.

       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.  errno is thread-local; setting it in one
       thread does not affect its value in any other thread.

       Valid error numbers are all non-zero; errno is never set to zero by any library	function.
       All the error names specified by POSIX.1 must have distinct values.

       POSIX.1	(1996  edition)  lists	the  following	symbolic error names.  Of these, EDOM and
       ERANGE are in the ISO C standard.  ISO C Amendment 1 defines the additional  error  number
       EILSEQ for coding errors in multibyte or wide characters.

       E2BIG  Arg list too long

       EACCES Permission denied

       EAGAIN Resource temporarily unavailable

       EBADF  Bad file descriptor

	      Bad message

       EBUSY  Resource busy

	      Operation canceled

       ECHILD No child processes

	      Resource deadlock avoided

       EDOM   Domain error

       EEXIST File exists

       EFAULT Bad address

       EFBIG  File too large

	      Operation in progress

       EINTR  Interrupted function call

       EINVAL Invalid argument

       EIO    Input/output error

       EISDIR Is a directory

       EMFILE Too many open files

       EMLINK Too many links

	      Inappropriate message buffer length

	      Filename too long

       ENFILE Too many open files in system

       ENODEV No such device

       ENOENT No such file or directory

	      Exec format error

       ENOLCK No locks available

       ENOMEM Not enough space

       ENOSPC No space left on device

       ENOSYS Function not implemented

	      Not a directory

	      Directory not empty

	      Not supported

       ENOTTY Inappropriate I/O control operation

       ENXIO  No such device or address

       EPERM  Operation not permitted

       EPIPE  Broken pipe

       ERANGE Result too large

       EROFS  Read-only file system

       ESPIPE Invalid seek

       ESRCH  No such process

	      Operation timed out

       EXDEV  Improper link

       Many  other  error numbers are returned by various Unix implementations.  System V returns
       ETXTBSY (Text file busy) if one tries to exec() a file that is currently open for writing.
       Linux also returns this error if one tries to have a file both memory mapped with VM_DENY-
       WRITE and open for writing.

       perror(3), strerror(3)

					    1998-03-30					 ERRNO(3)
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