github.com/afumu/libc@v0.0.6/musl/src/signal/psignal.c (about)

     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  }