EFUN(3)

NAME
esetfunc, emalloc, ecalloc, erealloc, estrdup, estrndup, estrlcat, estrlcpy, easprintf - error-checked utility functions

LIBRARY
libutil

SYNOPSIS
#include <sys/types.h>
#include <libutil.h>
void (*)(int, const char *, ...)
esetfunc(void (*)(int, const char *, ...));
void *
ecalloc(size_t n, size_t c);
void *
emalloc(size_t n);
void *
erealloc(void *p, size_t n);
char *
estrdup(const char *s);
char *
estrndup(const char *s, size_t len);
size_t
estrlcat(char *dst, const char *src, size_t len);
size_t
estrlcpy(char *dst, const char *src, size_t len);
int
easprintf(char ** restrict str, const char * restrict fmt, ...);

DESCRIPTION
The ecalloc(), emalloc(), erealloc(), estrdup(), estrndup(), estrlcat(), estrlcpy(), and easprintf() functions operate exactly as the corresponding functions that do not start with an ‘e’ except that in case of an error, they call the installed error handler that can be configured with esetfunc().

For the string handling functions, it is an error when the destination buffer is not large enough to hold the complete string. For functions that allocate memory or open a file, it is an error when they would return a null pointer. The default error handler is err(3). The function esetfunc() returns the previous error handler function. A NULL error handler will just call exit(3).

SEE ALSO
asprintf(3), calloc(3), err(3), exit(3), fopen(3), malloc(3), realloc(3), strdup(3), strlcat(3), strlcpy(3), strndup(3)

HISTORY
The error functions first appeared in DragonFly 2.11. They are originally from NetBSD.