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Only enable the Linux kernel BPF JIT compiler if we're on Linux. 

Unless we're going to do something if that fails, there's no point in
having enable_kernel_bpf_jit_compiler() return a success/failure
indication.

Fix indentation.

svn path=/trunk/; revision=51475
This commit is contained in:
Guy Harris 2013-08-22 17:36:30 +00:00
parent 4409bc2877
commit 347ea71bae
1 changed files with 22 additions and 10 deletions
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32
dumpcap.c
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@ -171,24 +171,30 @@ static void capture_loop_stop(void);
/** Close a pipe, or socket if \a from_socket is TRUE */
static void cap_pipe_close(int pipe_fd, gboolean from_socket _U_);
/* Enable kernel BPF jit compiler if available */
int enable_kernel_bpf_jit_compiler(void)
#ifdef __linux__
/*
* Enable kernel BPF JIT compiler if available.
* If any calls fail, just drive on - the JIT compiler might not be
* enabled, but filtering will still work, and it's not clear what
* we could do if the calls fail; should we just report the error
* and not continue to capture, should we report it as a warning, or
* what?
*/
void
enable_kernel_bpf_jit_compiler(void)
{
int fd;
ssize_t ret;
const char *file = "/proc/sys/net/core/bpf_jit_enable";
static const char file[] = "/proc/sys/net/core/bpf_jit_enable";
fd = open(file, O_WRONLY);
if (fd < 0)
return -1;
return;
ret = write(fd, "1", (unsigned int)strlen("1"));
write(fd, "1", strlen("1"));
close(fd);
return ret;
}
#endif
#if !defined (__linux__)
#ifndef HAVE_PCAP_BREAKLOOP
@ -238,6 +244,10 @@ int enable_kernel_bpf_jit_compiler(void)
/* whatever the deal with pcap_breakloop, linux doesn't support timeouts
* in pcap_dispatch(); on the other hand, select() works just fine there.
* Hence we use a select for that come what may.
*
* XXX - with TPACKET_V1 and TPACKET_V2, it currently uses select()
* internally, and, with TPACKET_V3, once that's supported, it'll
* support timeouts, at least as I understand the way the code works.
*/
#define MUST_DO_SELECT
#endif
@ -4403,7 +4413,9 @@ main(int argc, char *argv[])
#endif /* SIGINFO */
#endif /* _WIN32 */
enable_kernel_bpf_jit_compiler();
#ifdef __linux__
enable_kernel_bpf_jit_compiler();
#endif
/* ----------------------------------------------------------------- */
/* Privilege and capability handling */