minix/drivers/filter/util.c
Ben Gras 35a108b911 panic() cleanup.
this change
   - makes panic() variadic, doing full printf() formatting -
     no more NO_NUM, and no more separate printf() statements
     needed to print extra info (or something in hex) before panicing
   - unifies panic() - same panic() name and usage for everyone -
     vm, kernel and rest have different names/syntax currently
     in order to implement their own luxuries, but no longer
   - throws out the 1st argument, to make source less noisy.
     the panic() in syslib retrieves the server name from the kernel
     so it should be clear enough who is panicing; e.g.
         panic("sigaction failed: %d", errno);
     looks like:
         at_wini(73130): panic: sigaction failed: 0
         syslib:panic.c: stacktrace: 0x74dc 0x2025 0x100a
   - throws out report() - printf() is more convenient and powerful
   - harmonizes/fixes the use of panic() - there were a few places
     that used printf-style formatting (didn't work) and newlines
     (messes up the formatting) in panic()
   - throws out a few per-server panic() functions
   - cleans up a tie-in of tty with panic()

merging printf() and panic() statements to be done incrementally.
2010-03-05 15:05:11 +00:00

108 lines
2.7 KiB
C

/* Filter driver - utility functions */
#include "inc.h"
#include <sys/mman.h>
#include <signal.h>
static clock_t next_alarm;
/*===========================================================================*
* flt_malloc *
*===========================================================================*/
char *flt_malloc(size_t size, char *sbuf, size_t ssize)
{
/* Allocate a buffer for 'size' bytes. If 'size' is equal to or less
* than 'ssize', return the static buffer 'sbuf', otherwise, use
* malloc() to allocate memory dynamically.
*/
char *p;
if (size <= ssize)
return sbuf;
if(!(p = alloc_contig(size, 0, NULL)))
panic("out of memory: %d", size);
return p;
}
/*===========================================================================*
* flt_free *
*===========================================================================*/
void flt_free(char *buf, size_t size, char *sbuf)
{
/* Free a buffer previously allocated with flt_malloc().
*/
if(buf != sbuf)
free_contig(buf, size);
}
/*===========================================================================*
* print64 *
*===========================================================================*/
char *print64(u64_t p)
{
#define NB 10
static int n = 0;
static char buf[NB][100];
u32_t lo = ex64lo(p), hi = ex64hi(p);
n = (n+1) % NB;
if(!hi) sprintf(buf[n], "%lx", lo);
else sprintf(buf[n], "%lx%08lx", hi, lo);
return buf[n];
}
/*===========================================================================*
* flt_alarm *
*===========================================================================*/
clock_t flt_alarm(clock_t dt)
{
int r;
if(dt < 0)
return next_alarm;
r = sys_setalarm(dt, 0);
if(r != OK)
panic("sys_setalarm failed: %d", r);
if(dt == 0) {
if(!next_alarm)
panic("clearing unset alarm: %d", r);
next_alarm = 0;
} else {
if(next_alarm)
panic("overwriting alarm: %d", r);
if ((r = getuptime(&next_alarm)) != OK)
panic("getuptime failed: %d", r);
next_alarm += dt;
}
return next_alarm;
}
/*===========================================================================*
* got_alarm *
*===========================================================================*/
static void got_alarm(int sig)
{
/* Do nothing. */
}
/*===========================================================================*
* flt_sleep *
*===========================================================================*/
void flt_sleep(int secs)
{
/* Sleep for the given number of seconds. Don't use sleep(), as that
* will end up calling select() to VFS. This implementation could be
* improved.
*/
signal(SIGALRM, got_alarm);
alarm(secs);
pause();
}