esetfunc(3) [netbsd man page]

EFUN(3) 						   BSD Library Functions Manual 						   EFUN(3)

NAME

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

LIBRARY

     System Utilities Library (libutil, -lutil)

SYNOPSIS

     #include <util.h>

     void (*)(int, const char *, ...)
     esetfunc(void (*)(int, const char *, ...));

     int
     easprintf(char ** restrict str, const char * restrict fmt, ...);

     FILE *
     efopen(const char *p, const char *m);

     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
     evasprintf(char ** restrict str, const char * restrict fmt, ...);

DESCRIPTION

     The easprintf(), efopen(), ecalloc(), emalloc(), erealloc(), estrdup(), estrndup(), estrlcat(), estrlcpy(), and evasprintf() functions oper-
     ate exactly as the corresponding functions that do not start with an 'e' except that in case of an error, they call the installed error han-
     dler 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 func-
     tion 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), vasprintf(3)

BSD
								    May 3, 2010 							       BSD

SSP(3)							   BSD Library Functions Manual 						    SSP(3)

NAME

     ssp -- bounds checked libc functions

LIBRARY

     Buffer Overflow Protection Library (libssp, -lssp)

SYNOPSIS

     #include <ssp/stdio.h>

     int
     sprintf(char *str, const char *fmt, ...);

     int
     vsprintf(char *str, const char *fmt, va_list ap);

     int
     snprintf(char *str, size_t len, const char *fmt, ...);

     int
     vsnprintf(char *str, size_t len, const char *fmt, va_list ap);

     char *
     gets(char *str);

     char *
     fgets(char *str, int len, FILE *fp);

     #include <ssp/string.h>

     void *
     memcpy(void *str, const void *ptr, size_t len);

     void *
     memmove(void *str, const void *ptr, size_t len);

     void *
     memset(void *str, int val, size_t len);

     char *
     strcpy(char *str, const char *ptr, size_t len);

     char *
     strcat(char *str, const char *ptr, size_t len);

     char *
     strncpy(char *str, const char *ptr, size_t len);

     char *
     strncat(char *str, const char *ptr, size_t len);

     #include <ssp/strings.h>

     void *
     bcopy(const void *ptr, void *str, size_t len);

     void *
     bzero(void *str, size_t len);

     #include <ssp/unistd.h>

     ssize_t
     read(int fd, void *str, size_t len);

     int
     readlink(const char * restrict path, char * restrict str, size_t len);

     int
     getcwd(char *str, size_t len);

DESCRIPTION

     When _FORTIFY_SOURCE bounds checking is enabled as described below, the above functions get overwritten to use the __builtin_object_size(3)
     function to compute the size of str, if known at compile time, and perform bounds check on it in order to avoid data buffer or stack buffer
     overflows.  If an overflow is detected, the routines will call abort(3).

     To enable these function overrides the following should be added to the gcc(1) command line: ``-I/usr/include/ssp'' to override the standard
     include files and ``-D_FORTIFY_SOURCE=1'' or ``-D_FORTIFY_SOURCE=2''.

     If _FORTIFY_SOURCE is set to 1 the code will compute the maximum possible buffer size for str, and if set to 2 it will compute the minimum
     buffer size.

SEE ALSO

     gcc(1), __builtin_object_size(3), stdio(3), string(3), security(7)

HISTORY

     The ssp library appeared NetBSD 4.0.

BSD
								  March 21, 2011							       BSD