Originální popis anglicky:
strerror, strerror_r - get error message string
Návod, kniha: POSIX Programmer's Manual
#include <string.h>
char *strerror(int
errnum);
int strerror_r(int errnum, char *strerrbuf,
size_t buflen);
For
strerror(): The functionality described on this reference page is
aligned with the ISO C standard. Any conflict between the requirements
described here and the ISO C standard is unintentional. This volume of
IEEE Std 1003.1-2001 defers to the ISO C standard.
The
strerror() function shall map the error number in
errnum to a
locale-dependent error message string and shall return a pointer to it.
Typically, the values for
errnum come from
errno, but
strerror() shall map any value of type
int to a message.
The string pointed to shall not be modified by the application, but may be
overwritten by a subsequent call to
strerror() or
perror().
The contents of the error message strings returned by
strerror() should
be determined by the setting of the
LC_MESSAGES category in the current
locale.
The implementation shall behave as if no function defined in this volume of
IEEE Std 1003.1-2001 calls
strerror().
The
strerror() function shall not change the setting of
errno if
successful.
Since no return value is reserved to indicate an error, an application wishing
to check for error situations should set
errno to 0, then call
strerror(), then check
errno.
The
strerror() function need not be reentrant. A function that is not
required to be reentrant is not required to be thread-safe.
The
strerror_r() function shall map the error number in
errnum to
a locale-dependent error message string and shall return the string in the
buffer pointed to by
strerrbuf, with length
buflen.
Upon successful completion,
strerror() shall return a pointer to the
generated message string. On error
errno may be set, but no return
value is reserved to indicate an error.
Upon successful completion,
strerror_r() shall return 0. Otherwise, an
error number shall be returned to indicate the error.
These functions may fail if:
- EINVAL
- The value of errnum is not a valid error number.
The
strerror_r() function may fail if:
- ERANGE
- Insufficient storage was supplied via strerrbuf and
buflen to contain the generated message string.
The following sections are informative.
None.
None.
None.
None.
perror() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<string.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
