Added cygwin support.

Patch by Cygwin Ports maintainer <yselkowitz@users.sourceforge.net>.
See #578890.

sysdeps/cygwin/glibtop_private.c

@@ -0,0 +1,221 @@
+#include <config.h>
+#include <glibtop.h>
+#include <glibtop/error.h>
+
+#include "glibtop_private.h"
+
+#include <glib.h>
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+
+
+unsigned long long
+get_scaled(const char *buffer, const char *key)
+{
+	const char    *ptr = buffer;
+	char	      *next;
+	unsigned long long value;
+
+	if (key) {
+		if (G_LIKELY((ptr = strstr(buffer, key))))
+			ptr += strlen(key);
+		else {
+			g_warning("Could not read key '%s' in buffer '%s'",
+				  key, buffer);
+			return 0;
+		}
+	}
+
+	value = strtoull(ptr, &next, 0);
+
+	for ( ; *next; ++next) {
+		if (*next == 'k') {
+			value *= 1024;
+			break;
+		} else if (*next == 'M') {
+			value *= 1024 * 1024;
+			break;
+		}
+	}
+
+	return value;
+}
+
+
+char *
+skip_token (const char *p)
+{
+	p = next_token(p);
+	while (*p && !isspace(*p)) p++;
+	p = next_token(p);
+	return (char *)p;
+}
+
+
+/*
+ * Read functions
+ */
+enum TRY_FILE_TO_BUFFER
+{
+	TRY_FILE_TO_BUFFER_OK = 0,
+	TRY_FILE_TO_BUFFER_OPEN = -1,
+	TRY_FILE_TO_BUFFER_READ = -2
+};
+
+/*
+ * Doesn't handle bufsiz == 0
+ */
+int try_file_to_buffer(char *buffer, size_t bufsiz, const char *format, ...)
+{
+	char path[4096];
+	int fd;
+	size_t len = 0;
+	ssize_t nread = 0;
+	va_list pa;
+
+	if (G_UNLIKELY(bufsiz <= sizeof(char*)))
+	  g_warning("Huhu, bufsiz of %lu looks bad", (gulong)bufsiz);
+
+	va_start(pa, format);
+
+	/* C99 also provides vsnprintf */
+	g_vsnprintf(path, sizeof path, format, pa);
+
+	va_end(pa);
+
+	bufsiz--; /* reserve 1 for trailing NUL */
+	buffer [0] = '\0';
+
+	if((fd = open (path, O_RDONLY)) < 0)
+		return TRY_FILE_TO_BUFFER_OPEN;
+
+	while (len < bufsiz) {
+		nread = read (fd, buffer + len, bufsiz - len);
+
+		if (G_UNLIKELY(nread < 0)) {
+			if (errno == EINTR)
+				continue;
+			else
+				break;
+		}
+
+		len += nread;
+
+		if (nread == 0)
+			break;
+	}
+
+	close (fd);
+
+	if (nread < 0)
+		return TRY_FILE_TO_BUFFER_READ;
+
+	buffer [len] = '\0';
+
+	return TRY_FILE_TO_BUFFER_OK;
+}
+
+
+void
+file_to_buffer(glibtop *server, char *buffer, size_t bufsiz, const char *filename)
+{
+	switch(try_file_to_buffer(buffer, bufsiz, filename))
+	{
+	case TRY_FILE_TO_BUFFER_OPEN:
+		glibtop_error_io_r (server, "open (%s)", filename);
+	case TRY_FILE_TO_BUFFER_READ:
+		glibtop_error_io_r (server, "read (%s)", filename);
+	}
+}
+
+
+
+
+static unsigned long
+read_boot_time(glibtop *server)
+{
+	char* line = NULL;
+	size_t size = 0;
+	FILE* stat;
+	unsigned long btime = 0;
+
+	if (!(stat = fopen("/proc/stat", "r"))) {
+		glibtop_error_io_r(server, "fopen(\"/proc/stat\")");
+		goto out;
+	}
+
+	while (getline(&line, &size, stat) != -1) {
+		if (!strncmp(line, "btime", 5)) {
+			btime = strtoul(skip_token(line), NULL, 10);
+			break;
+		}
+	}
+
+	free(line);
+	fclose(stat);
+out:
+	return btime;
+}
+
+
+
+unsigned long
+get_boot_time(glibtop *server)
+{
+	static unsigned long boot_time = 0UL;
+
+	if(G_UNLIKELY(!boot_time))
+	{
+		boot_time = read_boot_time(server);
+	}
+
+	return boot_time;
+}
+
+
+size_t
+get_page_size(void)
+{
+	static size_t pagesize = 0;
+
+	if(G_UNLIKELY(!pagesize))
+	{
+		pagesize = getpagesize();
+	}
+
+	return pagesize;
+}
+
+
+
+gboolean
+check_cpu_line(glibtop *server, const char *line, unsigned i)
+{
+	char start[10];
+
+	g_snprintf(start, sizeof start, "cpu%u", i);
+
+	return g_str_has_prefix(line, start);
+}
+
+
+
+gboolean safe_readlink(const char *path, char *buf, size_t bufsiz)
+{
+	ssize_t ret;
+
+	ret = readlink(path, buf, bufsiz - 1);
+
+	if (ret == -1) {
+		g_warning("Could not read link %s : %s", path, strerror(errno));
+		return FALSE;
+	}
+
+	buf[ret] = '\0';
+	return TRUE;
+}