[gem5-dev] changeset in gem5: syscall_emul: implement fallocate

[Brandon Potter]

changeset f9aa72424274 in /z/repo/gem5
details: http://repo.gem5.org/gem5?cmd=changeset;node=f9aa72424274
description:
        syscall_emul: implement fallocate

diffstat:

 src/arch/x86/linux/process.cc |   2 +-
 src/sim/syscall_emul.cc       |  21 +++++++++++++++++++++
 src/sim/syscall_emul.hh       |   4 ++++
 3 files changed, 26 insertions(+), 1 deletions(-)

diffs (57 lines):

diff -r deaf82fd2e7c -r f9aa72424274 src/arch/x86/linux/process.cc
--- a/src/arch/x86/linux/process.cc     Thu Dec 15 13:16:03 2016 -0500
+++ b/src/arch/x86/linux/process.cc     Thu Dec 15 13:16:25 2016 -0500
@@ -503,7 +503,7 @@
     /* 282 */ SyscallDesc("signalfd", unimplementedFunc),
     /* 283 */ SyscallDesc("timerfd_create", unimplementedFunc),
     /* 284 */ SyscallDesc("eventfd", unimplementedFunc),
-    /* 285 */ SyscallDesc("fallocate", unimplementedFunc),
+    /* 285 */ SyscallDesc("fallocate", fallocateFunc),
     /* 286 */ SyscallDesc("timerfd_settime", unimplementedFunc),
     /* 287 */ SyscallDesc("timerfd_gettime", unimplementedFunc),
     /* 288 */ SyscallDesc("accept4", unimplementedFunc),
diff -r deaf82fd2e7c -r f9aa72424274 src/sim/syscall_emul.cc
--- a/src/sim/syscall_emul.cc   Thu Dec 15 13:16:03 2016 -0500
+++ b/src/sim/syscall_emul.cc   Thu Dec 15 13:16:25 2016 -0500
@@ -935,6 +935,27 @@
 }
 
 SyscallReturn
+fallocateFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
+              ThreadContext *tc)
+{
+    int index = 0;
+    int tgt_fd = process->getSyscallArg(tc, index);
+    int mode = process->getSyscallArg(tc, index);
+    off_t offset = process->getSyscallArg(tc, index);
+    off_t len = process->getSyscallArg(tc, index);
+
+    int sim_fd = process->getSimFD(tgt_fd);
+    if (sim_fd < 0)
+        return -EBADF;
+
+    int result = fallocate(sim_fd, mode, offset, len);
+    if (result < 0)
+        return -errno;
+
+    return 0;
+}
+
+SyscallReturn
 accessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc,
         int index)
 {
diff -r deaf82fd2e7c -r f9aa72424274 src/sim/syscall_emul.hh
--- a/src/sim/syscall_emul.hh   Thu Dec 15 13:16:03 2016 -0500
+++ b/src/sim/syscall_emul.hh   Thu Dec 15 13:16:25 2016 -0500
@@ -157,6 +157,10 @@
 SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
                          LiveProcess *p, ThreadContext *tc);
 
+// Target fallocateFunc() handler.
+SyscallReturn fallocateFunc(SyscallDesc *desc, int num,
+                            LiveProcess *p, ThreadContext *tc);
+
 /// Target exit() handler: terminate current context.
 SyscallReturn exitFunc(SyscallDesc *desc, int num,
                        LiveProcess *p, ThreadContext *tc);
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