src/signal/psignal.c

   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 }