psignal.c raw

   1  #include "stdio_impl.h"
   2  #include <string.h>
   3  #include <signal.h>
   4  #include <errno.h>
   5  
   6  void psignal(int sig, const char *msg)
   7  {
   8  	FILE *f = stderr;
   9  	char *s = strsignal(sig);
  10  
  11  	FLOCK(f);
  12  
  13  	/* Save stderr's orientation and encoding rule, since psignal is not
  14  	 * permitted to change them. Save errno and restore it if there is no
  15  	 * error since fprintf might change it even on success but psignal is
  16  	 * not permitted to do so. */
  17  	void *old_locale = f->locale;
  18  	int old_mode = f->mode;
  19  	int old_errno = errno;
  20  
  21  	if (fprintf(f, "%s%s%s\n", msg?msg:"", msg?": ":"", s)>=0)
  22  		errno = old_errno;
  23  	f->mode = old_mode;
  24  	f->locale = old_locale;
  25  
  26  	FUNLOCK(f);
  27  }
  28