This file is indexed.

/usr/include/diet/err.h is in dietlibc-dev 0.33~cvs20120325-4.

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The actual contents of the file can be viewed below.

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#ifndef _ERR_H
#define _ERR_H

#include <sys/cdefs.h>
#include <stdarg.h>

__BEGIN_DECLS

void err(int s, const char *f, ...) __attribute__((__deprecated__,__noreturn__,__format__(__printf__,2,3)));
void errc(int s, int e, const char *f, ...) __attribute__((__deprecated__,__noreturn__,__format__(__printf__,3,4)));
void errx(int s, const char *f, ...) __attribute__((__deprecated__,__noreturn__,__format__(__printf__,2,3)));

void warn(const char *f, ...) __attribute__((__deprecated__,__format__(__printf__,1,2)));
void warnc(int e, const char *f, ...) __attribute__((__deprecated__,__format__(__printf__,2,3)));
void warnx(const char *f, ...) __attribute__((__deprecated__,__format__(__printf__,1,2)));

void verr(int s, const char *f, va_list va) __attribute__((__deprecated__,__noreturn__,__format__(__printf__,2,0)));
void verrc(int s, int e, const char *f, va_list va) __attribute__((__deprecated__,__noreturn__,__format__(__printf__,3,0)));
void verrx(int s, const char *f, va_list va) __attribute__((__deprecated__,__noreturn__,__format__(__printf__,2,0)));

void vwarn(const char *f, va_list va) __attribute__((__deprecated__,__format__(__printf__,1,0)));
void vwarnc(int e, const char *f, va_list va) __attribute__((__deprecated__,__format__(__printf__,2,0)));
void vwarnx(const char *f, va_list va) __attribute__((__deprecated__,__format__(__printf__,1,0)));

__END_DECLS

#endif