Extract system call exit return value

[lttng-modules.git] / lttng-syscalls.c

diff --git a/lttng-syscalls.c b/lttng-syscalls.c
index 60c5fd997a4b42c3d5b5a9a937d959bfa65c56f3..029c806bfb4595accea7eb9d893da412abc7f07f 100644 (file)
--- a/lttng-syscalls.c
+++ b/lttng-syscalls.c
@@ -92,6 +92,14 @@ struct mmap_arg_struct;
 #include "instrumentation/syscalls/headers/syscalls_unknown.h"
 #undef TRACE_SYSTEM
 
+#define SC_ENTER
+
+#undef SC_EXIT_PROTO
+#define SC_EXIT_PROTO(...)
+#undef SC_EXIT_ARGS
+#define SC_EXIT_ARGS(...)
+#undef sc_exit
+#define sc_exit(...)
 
 /* Hijack probe callback for system call enter */
 #undef TP_PROBE_CB
@@ -152,6 +160,16 @@ struct mmap_arg_struct;
 #undef _TRACE_SYSCALLS_integers_H
 #undef _TRACE_SYSCALLS_pointers_H
 
+#undef SC_ENTER
+
+#define SC_EXIT
+
+#undef SC_EXIT_PROTO
+#define SC_EXIT_PROTO(...)     __VA_ARGS__
+#undef SC_EXIT_ARGS
+#define SC_EXIT_ARGS(...)      __VA_ARGS__
+#undef sc_exit
+#define sc_exit(...)           __VA_ARGS__
 
 /* Hijack probe callback for system call exit */
 #define TP_PROBE_CB(_template)         &syscall_exit_probe
@@ -210,6 +228,7 @@ struct mmap_arg_struct;
 #undef _TRACE_SYSCALLS_integers_H
 #undef _TRACE_SYSCALLS_pointers_H
 
+#undef SC_EXIT
 
 #undef TP_MODULE_NOINIT
 #undef LTTNG_PACKAGE_BUILD
@@ -224,6 +243,11 @@ struct trace_syscall_entry {
 
 #define CREATE_SYSCALL_TABLE
 
+#define SC_ENTER
+
+#undef sc_exit
+#define sc_exit(...)
+
 #undef TRACE_SYSCALL_TABLE
 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs)    \
        [ _nr ] = {                                             \
@@ -254,6 +278,13 @@ const struct trace_syscall_entry compat_sc_table[] = {
 #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
 };
 
+#undef SC_ENTER
+
+#define SC_EXIT
+
+#undef sc_exit
+#define sc_exit(...)           __VA_ARGS__
+
 #undef TRACE_SYSCALL_TABLE
 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs)    \
        [ _nr ] = {                                             \
@@ -284,6 +315,8 @@ const struct trace_syscall_entry compat_sc_exit_table[] = {
 #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
 };
 
+#undef SC_EXIT
+
 #undef CREATE_SYSCALL_TABLE
 
 struct lttng_syscall_filter {
@@ -511,47 +544,51 @@ void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret)
        switch (entry->nrargs) {
        case 0:
        {
-               void (*fptr)(void *__data) = entry->func;
+               void (*fptr)(void *__data, long ret) = entry->func;
 
-               fptr(event);
+               fptr(event, ret);
                break;
        }
        case 1:
        {
                void (*fptr)(void *__data,
+                       long ret,
                        unsigned long arg0) = entry->func;
                unsigned long args[1];
 
                syscall_get_arguments(current, regs, 0, entry->nrargs, args);
-               fptr(event, args[0]);
+               fptr(event, ret, args[0]);
                break;
        }
        case 2:
        {
                void (*fptr)(void *__data,
+                       long ret,
                        unsigned long arg0,
                        unsigned long arg1) = entry->func;
                unsigned long args[2];
 
                syscall_get_arguments(current, regs, 0, entry->nrargs, args);
-               fptr(event, args[0], args[1]);
+               fptr(event, ret, args[0], args[1]);
                break;
        }
        case 3:
        {
                void (*fptr)(void *__data,
+                       long ret,
                        unsigned long arg0,
                        unsigned long arg1,
                        unsigned long arg2) = entry->func;
                unsigned long args[3];
 
                syscall_get_arguments(current, regs, 0, entry->nrargs, args);
-               fptr(event, args[0], args[1], args[2]);
+               fptr(event, ret, args[0], args[1], args[2]);
                break;
        }
        case 4:
        {
                void (*fptr)(void *__data,
+                       long ret,
                        unsigned long arg0,
                        unsigned long arg1,
                        unsigned long arg2,
@@ -559,12 +596,13 @@ void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret)
                unsigned long args[4];
 
                syscall_get_arguments(current, regs, 0, entry->nrargs, args);
-               fptr(event, args[0], args[1], args[2], args[3]);
+               fptr(event, ret, args[0], args[1], args[2], args[3]);
                break;
        }
        case 5:
        {
                void (*fptr)(void *__data,
+                       long ret,
                        unsigned long arg0,
                        unsigned long arg1,
                        unsigned long arg2,
@@ -573,12 +611,13 @@ void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret)
                unsigned long args[5];
 
                syscall_get_arguments(current, regs, 0, entry->nrargs, args);
-               fptr(event, args[0], args[1], args[2], args[3], args[4]);
+               fptr(event, ret, args[0], args[1], args[2], args[3], args[4]);
                break;
        }
        case 6:
        {
                void (*fptr)(void *__data,
+                       long ret,
                        unsigned long arg0,
                        unsigned long arg1,
                        unsigned long arg2,
@@ -588,7 +627,7 @@ void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret)
                unsigned long args[6];
 
                syscall_get_arguments(current, regs, 0, entry->nrargs, args);
-               fptr(event, args[0], args[1], args[2],
+               fptr(event, ret, args[0], args[1], args[2],
                        args[3], args[4], args[5]);
                break;
        }