msync and Sytem V semaphore dummies

Ref #2467

repos/libports/include/libc-plugin/plugin.h

@@ -120,6 +120,7 @@ namespace Libc {
 			virtual void *mmap(void *addr, ::size_t length, int prot, int flags,
 			                   File_descriptor *, ::off_t offset);
 			virtual int munmap(void *addr, ::size_t length);
+			virtual int msync(void *addr, ::size_t len, int flags);
 			virtual File_descriptor *open(const char *pathname, int flags);
 			virtual int pipe(File_descriptor *pipefd[2]);
 			virtual ssize_t read(File_descriptor *, void *buf, ::size_t count);

repos/libports/lib/symbols/libc

@@ -428,6 +428,7 @@ mktime T
 mmap T
 mprotect W
 mrand48 T
+msync T
 munmap T
 nanosleep W
 nextwctype T
@@ -594,6 +595,8 @@ seekdir T
 select W
 semctl T
 semctl T
+semget W
+semop W
 send T
 sendto T
 setbuf T
@@ -1002,6 +1005,7 @@ _ZN4Libc6Plugin5ioctlEPNS_15File_descriptorEiPc T
 _ZN4Libc6Plugin5lseekEPNS_15File_descriptorEli T
 _ZN4Libc6Plugin5lseekEPNS_15File_descriptorExi T
 _ZN4Libc6Plugin5mkdirEPKct T
+_ZN4Libc6Plugin5msyncEPvmi T
 _ZN4Libc6Plugin5rmdirEPKc T
 _ZN4Libc6Plugin5writeEPNS_15File_descriptorEPKvj T
 _ZN4Libc6Plugin5writeEPNS_15File_descriptorEPKvm T

repos/libports/src/lib/libc/dummies.cc

@@ -124,6 +124,8 @@ DUMMY(mode_t,  0, umask, (mode_t))
 DUMMY(int   ,  0, utimes, (const char *, const timeval *))
 DUMMY(pid_t , -1, vfork, (void))
 DUMMY(pid_t , -1, _wait4, (pid_t, int *, int, struct rusage *))
+DUMMY(int, -1, semget, (key_t, int, int))
+DUMMY(int, -1, semop, (key_t, int, int))
 
 
 void ksem_init(void)

repos/libports/src/lib/libc/file_operations.cc

@@ -472,6 +472,30 @@ extern "C" int munmap(void *start, ::size_t length)
 }
 
 
+extern "C" int msync(void *start, ::size_t len, int flags)
+{
+	if (!mmap_registry()->registered(start)) {
+		Genode::warning("munmap: could not lookup plugin for address ", start);
+		errno = EINVAL;
+		return -1;
+	}
+
+	/*
+	 * Lookup plugin that was used for mmap
+	 *
+	 * If the pointer is NULL, 'start' refers to an anonymous mmap.
+	 */
+	Plugin *plugin = mmap_registry()->lookup_plugin_by_addr(start);
+
+	int ret = 0;
+	if (plugin)
+		ret = plugin->msync(start, len, flags);
+
+	return ret;
+}
+
+
+
 extern "C" int _open(const char *pathname, int flags, ::mode_t mode)
 {
 	Absolute_path resolved_path;

repos/libports/src/lib/libc/plugin.cc

@@ -203,6 +203,7 @@ DUMMY(int, -1, mkdir,        (const char*, mode_t));
 DUMMY(void *, (void *)(-1), mmap, (void *addr, ::size_t length, int prot, int flags,
                                    File_descriptor *, ::off_t offset));
 DUMMY(int, -1, munmap,       (void *, ::size_t));
+DUMMY(int, -1, msync,        (void *addr, ::size_t len, int flags));
 DUMMY(int, -1, pipe,         (File_descriptor*[2]));
 DUMMY(ssize_t, -1, readlink, (const char *, char *, ::size_t));
 DUMMY(int, -1, rename,       (const char *, const char *));