1 files changed, 226 insertions, 0 deletions
diff --git a/src/common.c b/src/common.c
new file mode 100755
index 000000000..e3c3afe3f
--- /dev/null
+++ b/src/common.c
@@ -0,0 +1,226 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <sys/syscall.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+
+
+#include "log.h"
+#include "common.h"
+#include "appconfig.h"
+
+char *global_host_prefix = "";
+int enable_ksm = 1;
+
+/*
+// http://stackoverflow.com/questions/7666509/hash-function-for-string
+uint32_t simple_hash(const char *name)
+{
+	const char *s = name;
+	uint32_t hash = 5381;
+	int i;
+
+	while((i = *s++)) hash = ((hash << 5) + hash) + i;
+
+	// fprintf(stderr, "HASH: %lu %s\n", hash, name);
+
+	return hash;
+}
+*/
+
+
+// http://isthe.com/chongo/tech/comp/fnv/#FNV-1a
+uint32_t simple_hash(const char *name) {
+	unsigned char *s = (unsigned char *)name;
+	uint32_t hval = 0x811c9dc5;
+
+	// FNV-1a algorithm
+	while (*s) {
+		// multiply by the 32 bit FNV magic prime mod 2^32
+		// gcc optimized
+		hval += (hval<<1) + (hval<<4) + (hval<<7) + (hval<<8) + (hval<<24);
+
+		// xor the bottom with the current octet
+		hval ^= (uint32_t)*s++;
+	}
+
+	// fprintf(stderr, "HASH: %u = %s\n", hval, name);
+	return hval;
+}
+
+/*
+// http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx
+// one at a time hash
+uint32_t simple_hash(const char *name) {
+	unsigned char *s = (unsigned char *)name;
+	uint32_t h = 0;
+
+	while(*s) {
+		h += *s++;
+		h += (h << 10);
+		h ^= (h >> 6);
+	}
+
+	h += (h << 3);
+	h ^= (h >> 11);
+	h += (h << 15);
+
+	// fprintf(stderr, "HASH: %u = %s\n", h, name);
+
+	return h;
+}
+*/
+
+void strreverse(char* begin, char* end)
+{
+    char aux;
+    while (end > begin)
+        aux = *end, *end-- = *begin, *begin++ = aux;
+}
+
+char *mystrsep(char **ptr, char *s)
+{
+	char *p = "";
+	while ( p && !p[0] && *ptr ) p = strsep(ptr, s);
+	return(p);
+}
+
+char *trim(char *s)
+{
+	// skip leading spaces
+	while(*s && isspace(*s)) s++;
+	if(!*s || *s == '#') return NULL;
+
+	// skip tailing spaces
+	long c = (long) strlen(s) - 1;
+	while(c >= 0 && isspace(s[c])) {
+		s[c] = '\0';
+		c--;
+	}
+	if(c < 0) return NULL;
+	if(!*s) return NULL;
+	return s;
+}
+
+void *mymmap(const char *filename, size_t size, int flags, int ksm)
+{
+	int fd;
+	void *mem = NULL;
+
+	errno = 0;
+	fd = open(filename, O_RDWR|O_CREAT|O_NOATIME, 0664);
+	if(fd != -1) {
+		if(lseek(fd, size, SEEK_SET) == (long)size) {
+			if(write(fd, "", 1) == 1) {
+				if(ftruncate(fd, size))
+					error("Cannot truncate file '%s' to size %ld. Will use the larger file.", filename, size);
+
+#ifdef MADV_MERGEABLE
+				if(flags & MAP_SHARED || !enable_ksm || !ksm) {
+#endif
+					mem = mmap(NULL, size, PROT_READ|PROT_WRITE, flags, fd, 0);
+					if(mem) {
+						int advise = MADV_SEQUENTIAL|MADV_DONTFORK;
+						if(flags & MAP_SHARED) advise |= MADV_WILLNEED;
+
+						if(madvise(mem, size, advise) != 0)
+							error("Cannot advise the kernel about the memory usage of file '%s'.", filename);
+					}
+#ifdef MADV_MERGEABLE
+				}
+				else {
+					mem = mmap(NULL, size, PROT_READ|PROT_WRITE, flags|MAP_ANONYMOUS, -1, 0);
+					if(mem) {
+						if(lseek(fd, 0, SEEK_SET) == 0) {
+							if(read(fd, mem, size) != (ssize_t)size)
+								error("Cannot read from file '%s'", filename);
+						}
+						else
+							error("Cannot seek to beginning of file '%s'.", filename);
+
+						// don't use MADV_SEQUENTIAL|MADV_DONTFORK, they disable MADV_MERGEABLE
+						if(madvise(mem, size, MADV_SEQUENTIAL|MADV_DONTFORK) != 0)
+							error("Cannot advise the kernel about the memory usage (MADV_SEQUENTIAL|MADV_DONTFORK) of file '%s'.", filename);
+
+						if(madvise(mem, size, MADV_MERGEABLE) != 0)
+							error("Cannot advise the kernel about the memory usage (MADV_MERGEABLE) of file '%s'.", filename);
+					}
+					else
+						error("Cannot allocate PRIVATE ANONYMOUS memory for KSM for file '%s'.", filename);
+				}
+#endif
+			}
+			else error("Cannot write to file '%s' at position %ld.", filename, size);
+		}
+		else error("Cannot seek file '%s' to size %ld.", filename, size);
+
+		close(fd);
+	}
+	else error("Cannot create/open file '%s'.", filename);
+
+	return mem;
+}
+
+int savememory(const char *filename, void *mem, unsigned long size)
+{
+	char tmpfilename[FILENAME_MAX + 1];
+
+	snprintf(tmpfilename, FILENAME_MAX, "%s.%ld.tmp", filename, (long)getpid());
+
+	int fd = open(tmpfilename, O_RDWR|O_CREAT|O_NOATIME, 0664);
+	if(fd < 0) {
+		error("Cannot create/open file '%s'.", filename);
+		return -1;
+	}
+
+	if(write(fd, mem, size) != (long)size) {
+		error("Cannot write to file '%s' %ld bytes.", filename, (long)size);
+		close(fd);
+		return -1;
+	}
+
+	close(fd);
+
+	int ret = 0;
+	if(rename(tmpfilename, filename)) {
+		error("Cannot rename '%s' to '%s'", tmpfilename, filename);
+		ret = -1;
+	}
+
+	return ret;
+}
+
+int fd_is_valid(int fd) {
+    return fcntl(fd, F_GETFD) != -1 || errno != EBADF;
+}
+
+/*
+ ***************************************************************************
+ * Get number of clock ticks per second.
+ ***************************************************************************
+ */
+unsigned int hz;
+
+void get_HZ(void)
+{
+	long ticks;
+
+	if ((ticks = sysconf(_SC_CLK_TCK)) == -1) {
+		perror("sysconf");
+	}
+
+	hz = (unsigned int) ticks;
+}
+
+pid_t gettid(void)
+{
+	return syscall(SYS_gettid);
+}
+