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/usr/include/proc/alloc.h is in libprocps-dev 2:3.3.12-3+deb9u1.

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#ifndef PROCPS_PROC_ALLOC_H
#define PROCPS_PROC_ALLOC_H

#include "procps.h"

EXTERN_C_BEGIN

 /* change xalloc_err_handler to override the default fprintf(stderr... */
extern message_fn xalloc_err_handler;

extern void *xcalloc(size_t size) MALLOC;
extern void *xmalloc(size_t size) MALLOC;
extern void *xrealloc(void *oldp, size_t size) MALLOC;
extern char *xstrdup(const char *str) MALLOC;

EXTERN_C_END

#endif