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ev_avoid_stdio

master
Marc Alexander Lehmann 11 years ago
parent
commit
e696c1caec
  1. 3
      Changes
  2. 60
      ev.c
  3. 32
      ev.pod

3
Changes

@ -11,6 +11,9 @@ Revision history for libev, a high-performance and full-featured event loop.
and analyzed by Aivars Kalvans).
- improve header file compatibility of the standalone eventfd code
in an obscure case.
- implement EV_AVOID_STDIO option.
- do not use sscanf to parse linux version number (smaller, faster,
no sscanf dependency).
3.9 Thu Dec 31 07:59:59 CET 2009
- signalfd is no longer used by default and has to be requested

60
ev.c

@ -544,7 +544,15 @@ ev_syserr (const char *msg)
syserr_cb (msg);
else
{
#if EV_AVOID_STDIO
write (STDERR_FILENO, msg, strlen (msg));
write (STDERR_FILENO, ": ", 2);
msg = strerror (errno);
write (STDERR_FILENO, msg, strlen (msg));
write (STDERR_FILENO, "\n", 1);
#else
perror (msg);
#endif
abort ();
}
}
@ -579,7 +587,12 @@ ev_realloc (void *ptr, long size)
if (!ptr && size)
{
#if EV_AVOID_STDIO
write (STDERR_FILENO, "libev: memory allocation failed, aborting.",
sizeof ("libev: memory allocation failed, aborting.") - 1);
#else
fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
#endif
abort ();
}
@ -2994,24 +3007,45 @@ infy_cb (EV_P_ ev_io *w, int revents)
}
}
inline_size void
check_2625 (EV_P)
inline_size unsigned int
ev_linux_version (void)
{
/* kernels < 2.6.25 are borked
* http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
*/
struct utsname buf;
int major, minor, micro;
unsigned int v;
int i;
char *p = buf.release;
if (uname (&buf))
return;
return 0;
if (sscanf (buf.release, "%d.%d.%d", &major, &minor, &micro) != 3)
return;
for (i = 3+1; --i; )
{
unsigned int c = 0;
if (major < 2
|| (major == 2 && minor < 6)
|| (major == 2 && minor == 6 && micro < 25))
for (;;)
{
if (*p >= '0' && *p <= '9')
c = c * 10 + *p++ - '0';
else
{
p += *p == '.';
break;
}
}
v = (v << 8) | c;
}
return v;
}
inline_size void
ev_check_2625 (EV_P)
{
/* kernels < 2.6.25 are borked
* http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
*/
if (ev_linux_version () < 0x020619)
return;
fs_2625 = 1;
@ -3036,7 +3070,7 @@ infy_init (EV_P)
fs_fd = -1;
check_2625 (EV_A);
ev_check_2625 (EV_A);
fs_fd = infy_newfd ();

32
ev.pod

@ -3619,12 +3619,19 @@ For this of course you need the m4 file:
=head2 PREPROCESSOR SYMBOLS/MACROS
Libev can be configured via a variety of preprocessor symbols you have to
define before including any of its files. The default in the absence of
autoconf is documented for every option.
define before including (or compiling) any of its files. The default in
the absence of autoconf is documented for every option.
Symbols marked with "(h)" do not change the ABI, and can have different
values when compiling libev vs. including F<ev.h>, so it is permissible
to redefine them before including F<ev.h> without breakign compatibility
to a compiled library. All other symbols change the ABI, which means all
users of libev and the libev code itself must be compiled with compatible
settings.
=over 4
=item EV_STANDALONE
=item EV_STANDALONE (h)
Must always be C<1> if you do not use autoconf configuration, which
keeps libev from including F<config.h>, and it also defines dummy
@ -3784,24 +3791,24 @@ as well as for signal and thread safety in C<ev_async> watchers.
In the absence of this define, libev will use C<sig_atomic_t volatile>
(from F<signal.h>), which is usually good enough on most platforms.
=item EV_H
=item EV_H (h)
The name of the F<ev.h> header file used to include it. The default if
undefined is C<"ev.h"> in F<event.h>, F<ev.c> and F<ev++.h>. This can be
used to virtually rename the F<ev.h> header file in case of conflicts.
=item EV_CONFIG_H
=item EV_CONFIG_H (h)
If C<EV_STANDALONE> isn't C<1>, this variable can be used to override
F<ev.c>'s idea of where to find the F<config.h> file, similarly to
C<EV_H>, above.
=item EV_EVENT_H
=item EV_EVENT_H (h)
Similarly to C<EV_H>, this macro can be used to override F<event.c>'s idea
of how the F<event.h> header can be found, the default is C<"event.h">.
=item EV_PROTOTYPES
=item EV_PROTOTYPES (h)
If defined to be C<0>, then F<ev.h> will not define any function
prototypes, but still define all the structs and other symbols. This is
@ -3883,6 +3890,17 @@ provide a bare-bones event library. See C<ev.h> for details on what parts
of the API are still available, and do not complain if this subset changes
over time.
=item EV_AVOID_STDIO
If this is set to C<1> at compiletime, then libev will avoid using stdio
functions (printf, scanf, perror etc.). This will increase the codesize
somewhat, but if your program doesn't otherwise depend on stdio and your
libc allows it, this avoids linking in the stdio library which is quite
big.
Note that error messages might become less precise when this option is
enabled.
=item EV_NSIG
The highest supported signal number, +1 (or, the number of

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