The following functions are provided by SecProgLib:

extern char *s_strncpy(char *dest, char *src, size_t n);
extern char *s_strncat(char *dest, char *src, size_t n);
extern int   s_execv(const char *filename, char *const argv[]);
extern FILE *s_tmpfile(void);
extern FILE *s_popen(char *cmd, const char *type);
extern int   safe_tmpfile(char *filename);
extern int   safe_reopen(char *file, int mode);
extern int   sigprotection(u_int toggle, sigset_t *sp_blockmask);
extern int   close_stdfds(void); // fix for old glibc
extern int   setlimits(sl_limit slim);
extern int   setupsbitproc(void);
extern int   chkpathperm(char *path_full, char *path_hit, size_t path_size, cpp_stat *stptr, int depth);

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