perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/

Several people have suggested that 'perf' has become a full-fledged
tool that should be moved out of Documentation/. Move it to the
(new) tools/ directory.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 206 insertions, 0 deletions

diff --git a/tools/perf/util/wrapper.c b/tools/perf/util/wrapper.c
new file mode 100644
index 000000000000..6350d65f6d9e
--- /dev/null
+++ b/tools/perf/util/wrapper.c
@@ -0,0 +1,206 @@
+/*
+ * Various trivial helper wrappers around standard functions
+ */
+#include "cache.h"
+
+/*
+ * There's no pack memory to release - but stay close to the Git
+ * version so wrap this away:
+ */
+static inline void release_pack_memory(size_t size, int flag)
+{
+}
+
+char *xstrdup(const char *str)
+{
+        char *ret = strdup(str);
+        if (!ret) {
+                release_pack_memory(strlen(str) + 1, -1);
+                ret = strdup(str);
+                if (!ret)
+                        die("Out of memory, strdup failed");
+        }
+        return ret;
+}
+
+void *xmalloc(size_t size)
+{
+        void *ret = malloc(size);
+        if (!ret && !size)
+                ret = malloc(1);
+        if (!ret) {
+                release_pack_memory(size, -1);
+                ret = malloc(size);
+                if (!ret && !size)
+                        ret = malloc(1);
+                if (!ret)
+                        die("Out of memory, malloc failed");
+        }
+#ifdef XMALLOC_POISON
+        memset(ret, 0xA5, size);
+#endif
+        return ret;
+}
+
+/*
+ * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
+ * "data" to the allocated memory, zero terminates the allocated memory,
+ * and returns a pointer to the allocated memory. If the allocation fails,
+ * the program dies.
+ */
+void *xmemdupz(const void *data, size_t len)
+{
+        char *p = xmalloc(len + 1);
+        memcpy(p, data, len);
+        p[len] = '\0';
+        return p;
+}
+
+char *xstrndup(const char *str, size_t len)
+{
+        char *p = memchr(str, '\0', len);
+        return xmemdupz(str, p ? p - str : len);
+}
+
+void *xrealloc(void *ptr, size_t size)
+{
+        void *ret = realloc(ptr, size);
+        if (!ret && !size)
+                ret = realloc(ptr, 1);
+        if (!ret) {
+                release_pack_memory(size, -1);
+                ret = realloc(ptr, size);
+                if (!ret && !size)
+                        ret = realloc(ptr, 1);
+                if (!ret)
+                        die("Out of memory, realloc failed");
+        }
+        return ret;
+}
+
+void *xcalloc(size_t nmemb, size_t size)
+{
+        void *ret = calloc(nmemb, size);
+        if (!ret && (!nmemb || !size))
+                ret = calloc(1, 1);
+        if (!ret) {
+                release_pack_memory(nmemb * size, -1);
+                ret = calloc(nmemb, size);
+                if (!ret && (!nmemb || !size))
+                        ret = calloc(1, 1);
+                if (!ret)
+                        die("Out of memory, calloc failed");
+        }
+        return ret;
+}
+
+void *xmmap(void *start, size_t length,
+        int prot, int flags, int fd, off_t offset)
+{
+        void *ret = mmap(start, length, prot, flags, fd, offset);
+        if (ret == MAP_FAILED) {
+                if (!length)
+                        return NULL;
+                release_pack_memory(length, fd);
+                ret = mmap(start, length, prot, flags, fd, offset);
+                if (ret == MAP_FAILED)
+                        die("Out of memory? mmap failed: %s", strerror(errno));
+        }
+        return ret;
+}
+
+/*
+ * xread() is the same a read(), but it automatically restarts read()
+ * operations with a recoverable error (EAGAIN and EINTR). xread()
+ * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
+ */
+ssize_t xread(int fd, void *buf, size_t len)
+{
+        ssize_t nr;
+        while (1) {
+                nr = read(fd, buf, len);
+                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
+                        continue;
+                return nr;
+        }
+}
+
+/*
+ * xwrite() is the same a write(), but it automatically restarts write()
+ * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
+ * GUARANTEE that "len" bytes is written even if the operation is successful.
+ */
+ssize_t xwrite(int fd, const void *buf, size_t len)
+{
+        ssize_t nr;
+        while (1) {
+                nr = write(fd, buf, len);
+                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
+                        continue;
+                return nr;
+        }
+}
+
+ssize_t read_in_full(int fd, void *buf, size_t count)
+{
+        char *p = buf;
+        ssize_t total = 0;
+
+        while (count > 0) {
+                ssize_t loaded = xread(fd, p, count);
+                if (loaded <= 0)
+                        return total ? total : loaded;
+                count -= loaded;
+                p += loaded;
+                total += loaded;
+        }
+
+        return total;
+}
+
+ssize_t write_in_full(int fd, const void *buf, size_t count)
+{
+        const char *p = buf;
+        ssize_t total = 0;
+
+        while (count > 0) {
+                ssize_t written = xwrite(fd, p, count);
+                if (written < 0)
+                        return -1;
+                if (!written) {
+                        errno = ENOSPC;
+                        return -1;
+                }
+                count -= written;
+                p += written;
+                total += written;
+        }
+
+        return total;
+}
+
+int xdup(int fd)
+{
+        int ret = dup(fd);
+        if (ret < 0)
+                die("dup failed: %s", strerror(errno));
+        return ret;
+}
+
+FILE *xfdopen(int fd, const char *mode)
+{
+        FILE *stream = fdopen(fd, mode);
+        if (stream == NULL)
+                die("Out of memory? fdopen failed: %s", strerror(errno));
+        return stream;
+}
+
+int xmkstemp(char *template)
+{
+        int fd;
+
+        fd = mkstemp(template);
+        if (fd < 0)
+                die("Unable to create temporary file: %s", strerror(errno));
+        return fd;
+}