[PATCH] aubdump: add --command option to stream aubdump to another program

[Lionel Landwerlin <llandwerlin@gmail.com>]

This comes handy if you want to look at your application output without
having to save it into a file. For example, use this with aubinator from
Mesa :

$ intel_aubdump -c '/path/to/aubinator --gen=hsw' my_gl_app

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Kristian Høgsberg <krh@bitplanet.net>
---
 tools/aubdump.c        | 101 +++++++++++++++++++++++++++++++++++++++----------
 tools/intel_aubdump.in |  26 ++++++++++++-
 2 files changed, 106 insertions(+), 21 deletions(-)

diff --git a/tools/aubdump.c b/tools/aubdump.c
index 30dc742..5c0e2bb 100644
--- a/tools/aubdump.c
+++ b/tools/aubdump.c
@@ -50,6 +50,7 @@ static int (*libc_close)(int fd) = close_init_helper;
 static int (*libc_ioctl)(int fd, unsigned long request, ...) = ioctl_init_helper;
 
 static int drm_fd = -1;
+static char *command;
 static char *filename;
 static FILE *file;
 static int gen = 0;
@@ -113,6 +114,76 @@ fail_if(int cond, const char *format, ...)
 	raise(SIGTRAP);
 }
 
+static FILE *
+launch_command(void)
+{
+	int i = 0, fds[2];
+	char **args = calloc(strlen(command), sizeof(char *));
+	char *iter = command;
+
+	args[i++] = iter = command;
+
+	while ((iter = strstr(iter, ",")) != NULL) {
+		*iter = '\0';
+		iter += 1;
+		args[i++] = iter;
+	}
+
+	if (pipe(fds) == -1)
+		return NULL;
+
+	switch (fork()) {
+	case 0:
+		dup2(fds[0], 0);
+		fail_if(execv(args[0], args) == -1,
+			"intel_aubdump: fail to launch child command\n");
+		return NULL;
+
+	default:
+		free(args);
+		return fdopen(fds[1], "w");
+
+	case -1:
+		return NULL;
+	}
+}
+
+static void
+maybe_init_output(void)
+{
+	const char *args;
+	static bool initialized = false;
+	int nb_args;
+
+	if (initialized)
+		return;
+
+	args = getenv("INTEL_AUBDUMP_ARGS");
+
+	nb_args = sscanf(args, "verbose=%d;file=%m[^;];device=%i;command=%m[^;];",
+			 &verbose, &filename, &device, &command);
+	fail_if(nb_args != 4, "intel_aubdump: invalid number of arguments");
+        fail_if(filename == NULL || command == NULL,
+                "intel_aubdump: out of memory\n");
+	if (device)
+		device_override = true;
+
+	bos = malloc(MAX_BO_COUNT * sizeof(bos[0]));
+	fail_if(bos == NULL, "intel_aubdump: out of memory\n");
+
+        if (strlen(command) != 0) {
+          file = launch_command();
+          fail_if(file == NULL,
+                  "intel_aubdump: failed to launch command '%s'\n", command);
+        } else {
+          file = fopen(filename, "w+");
+          fail_if(file == NULL,
+                  "intel_aubdump: failed to open file '%s'\n", filename);
+        }
+
+	initialized = true;
+}
+
 static struct bo *
 get_bo(uint32_t handle)
 {
@@ -140,13 +211,18 @@ align_u64(uint64_t v, uint64_t a)
 static void
 dword_out(uint32_t data)
 {
-	fwrite(&data, 1, 4, file);
+	fail_if(fwrite(&data, 1, 4, file) == 0,
+		"Writing to output failed\n");
 }
 
 static void
 data_out(const void *data, size_t size)
 {
-	fwrite(data, 1, size, file);
+	if (size == 0)
+		return;
+
+	fail_if(fwrite(data, 1, size, file) == 0,
+		"Writing to output failed\n");
 }
 
 static void
@@ -447,6 +523,8 @@ ioctl(int fd, unsigned long request, ...)
 	}
 
 	if (fd == drm_fd) {
+		maybe_init_output();
+
 		switch (request) {
 		case DRM_IOCTL_I915_GETPARAM: {
 			struct drm_i915_getparam *getparam = argp;
@@ -550,26 +628,8 @@ ioctl(int fd, unsigned long request, ...)
 static void
 init(void)
 {
-	const char *args = getenv("INTEL_AUBDUMP_ARGS");
-
 	libc_close = dlsym(RTLD_NEXT, "close");
 	libc_ioctl = dlsym(RTLD_NEXT, "ioctl");
-	fail_if(libc_close == NULL || libc_ioctl == NULL,
-		"intel_aubdump: failed to get libc ioctl or close\n");
-
-	if (sscanf(args, "verbose=%d;file=%m[^;];device=%i",
-		   &verbose, &filename, &device) != 3)
-		filename = strdup("intel.aub");
-	fail_if(filename == NULL, "intel_aubdump: out of memory\n");
-
-	if (device)
-		device_override = true;
-
-	bos = malloc(MAX_BO_COUNT * sizeof(bos[0]));
-	fail_if(bos == NULL, "intel_aubdump: out of memory\n");
-
-	file = fopen(filename, "w+");
-	fail_if(file == NULL, "intel_aubdump: failed to open file '%s'\n", filename);
 }
 
 static int
@@ -596,6 +656,7 @@ ioctl_init_helper(int fd, unsigned long request, ...)
 static void __attribute__ ((destructor))
 fini(void)
 {
+	free(command);
 	free(filename);
 	if (file)
 		fclose(file);
diff --git a/tools/intel_aubdump.in b/tools/intel_aubdump.in
index 3666b6e..2357e9b 100644
--- a/tools/intel_aubdump.in
+++ b/tools/intel_aubdump.in
@@ -10,6 +10,9 @@ contents and execution of the GEM application.
 
   -o, --output=FILE  Name of AUB file. Defaults to COMMAND.aub
 
+  -c, --command=CMD  Execute CMD and write the AUB file's content to its
+                     standard input
+
       --device=ID    Override PCI ID of the reported device
 
   -v                 Enable verbose output
@@ -23,6 +26,19 @@ EOF
 
 verbose=0
 device=0
+file="intel.aub"
+command=""
+
+build_command () {
+    command=""
+    for i in $1; do
+        if [ -z $command ]; then
+            command=$i
+        else
+            command="$command,$i"
+        fi;
+    done
+}
 
 while true; do
       case "$1" in
@@ -38,6 +54,14 @@ while true; do
 	      file=${1##--output=}
 	      shift
 	      ;;
+	  -c)
+              build_command "$2"
+	      shift 2
+	      ;;
+	  --command=*)
+              build_command "${1##--command=}"
+	      shift
+	      ;;
 	  --device=*)
 	      device=${1##--device=}
 	      shift
@@ -69,5 +93,5 @@ exec_prefix=@exec_prefix@
 libdir=@libdir@
 
 LD_PRELOAD=${libdir}/intel_aubdump.so${LD_PPRELOAD:+:${LD_PRELOAD}} \
-	  INTEL_AUBDUMP_ARGS="verbose=$verbose;file=$file;device=$device" \
+	  INTEL_AUBDUMP_ARGS="verbose=$verbose;file=$file;device=$device;command=$command;" \
 	  exec -- "$@"
-- 
2.9.3

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