sys/resource.h: add rusage compatibility fields, set to zero

POSIX defines this structure but specifies only two fields (which we
already implement). However, both the *BSD and Linux have agreed on
some more fields, which are often assumed to be there by applications.

The benefice of having compatibility fields is
greater as having to patch every other software at HaikuPorts.

Change-Id: Ie28ca2e348aa16b4c57eb3498eb62175100d9b9d
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4083
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: Niels Sascha Reedijk <[email protected]>
Reviewed-by: Jérôme Duval <[email protected]>

headers/posix/sys/resource.h

@@ -44,6 +44,22 @@ struct rlimit {
 struct rusage {
 	struct timeval ru_utime;	/* user time used */
 	struct timeval ru_stime;	/* system time used */
+
+	/* unused, only for compatibility with other systems */
+	long	ru_maxrss;
+	long	ru_ixrss;
+	long	ru_idrss;
+	long	ru_isrss;
+	long	ru_minflt;
+	long	ru_majflt;
+	long	ru_nswap;
+	long	ru_inblock;
+	long	ru_oublock;
+	long	ru_msgsnd;
+	long	ru_msgrcv;
+	long	ru_nsignals;
+	long	ru_nvcsw;
+	long	ru_nivcsw;
 };
 
 #define RUSAGE_SELF     0

src/libs/bsd/Jamfile

@@ -5,6 +5,9 @@ UseHeaders [ FDirName $(HAIKU_TOP) headers compatibility bsd ] : true ;
 local architectureObject ;
 for architectureObject in [ MultiArchSubDirSetup ] {
 	on $(architectureObject) {
+		SetVersionScript [ MultiArchDefaultGristFiles libbsd.so ] :
+			libbsd_versions ;
+
 		SharedLibrary [ MultiArchDefaultGristFiles libbsd.so ] :
 			daemon.c
 			err.c

src/libs/bsd/libbsd_versions

@@ -0,0 +1,5 @@
+LIBBSD_BASE {
+};
+
+LIBBSD_1_BETA3 {
+} LIBBSD_BASE;

src/libs/bsd/wait.c

@@ -15,16 +15,23 @@
 extern pid_t _waitpid(pid_t pid, int* _status, int options,
 		team_usage_info *usage_info);
 
+// prototypes for the compiler
+pid_t _wait3_base(int *status, int options, struct rusage *rusage);
+pid_t _wait4_base(pid_t pid, int *status, int options, struct rusage *rusage);
+pid_t _wait3_current(int *status, int options, struct rusage *rusage);
+pid_t _wait4_current(pid_t pid, int *status, int options,
+	struct rusage *rusage);
+
 
 pid_t
-wait3(int *status, int options, struct rusage *rusage)
+_wait3_base(int *status, int options, struct rusage *rusage)
 {
-	return wait4(-1, status, options, rusage);
+	return _wait4_base(-1, status, options, rusage);
 }
 
 
 pid_t
-wait4(pid_t pid, int *status, int options, struct rusage *rusage)
+_wait4_base(pid_t pid, int *status, int options, struct rusage *rusage)
 {
 	team_usage_info info;
 	pid_t waitPid = _waitpid(pid, status, options,
@@ -40,3 +47,32 @@ wait4(pid_t pid, int *status, int options, struct rusage *rusage)
 	return waitPid;
 }
 
+
+pid_t
+_wait3_current(int *status, int options, struct rusage *rusage)
+{
+	return _wait4_current(-1, status, options, rusage);
+}
+
+
+pid_t
+_wait4_current(pid_t pid, int *status, int options, struct rusage *rusage)
+{
+	pid_t waitPid = _wait4_base(pid, status, options, rusage);
+	if (waitPid != -1 && rusage != NULL) {
+		memset(&rusage->ru_maxrss, 0, sizeof(struct rusage) -
+			offsetof(struct rusage, ru_maxrss));
+	}
+
+	return waitPid;
+}
+
+
+#define DEFINE_LIBBSD_SYMBOL_VERSION(function, symbol, version) \
+	B_DEFINE_SYMBOL_VERSION(function, symbol "LIBBSD_" version)
+
+DEFINE_LIBBSD_SYMBOL_VERSION("_wait3_base", "wait3@", "BASE");
+DEFINE_LIBBSD_SYMBOL_VERSION("_wait4_base", "wait4@", "BASE");
+DEFINE_LIBBSD_SYMBOL_VERSION("_wait3_current", "wait3@@", "1_BETA3");
+DEFINE_LIBBSD_SYMBOL_VERSION("_wait4_current", "wait4@@", "1_BETA3");
+

src/system/libroot/libroot_versions

@@ -9,3 +9,6 @@ LIBROOT_1_ALPHA4 {
 
 LIBROOT_1_ALPHA5 {
 } LIBROOT_1_ALPHA4;
+
+LIBROOT_1_BETA3 {
+} LIBROOT_1_ALPHA5;

src/system/libroot/posix/sys/getrusage.c

@@ -9,10 +9,16 @@
 #include <errno.h>
 
 #include <errno_private.h>
+#include <symbol_versioning.h>
+
+
+// prototypes for the compiler
+int _getrusage_base(int who, struct rusage *rusage);
+int _getrusage_current(int who, struct rusage *rusage);
 
 
 int
-getrusage(int who, struct rusage *rusage)
+_getrusage_base(int who, struct rusage *rusage)
 {
 	team_usage_info info;
 
@@ -30,3 +36,19 @@ getrusage(int who, struct rusage *rusage)
 	return 0;
 }
 
+
+int
+_getrusage_current(int who, struct rusage *rusage)
+{
+	int err = _getrusage_base(who, rusage);
+	if (err != -1) {
+		memset(&rusage->ru_maxrss, 0, sizeof(struct rusage) -
+			offsetof(struct rusage, ru_maxrss));
+	}
+	return err;
+}
+
+
+DEFINE_LIBROOT_KERNEL_SYMBOL_VERSION("_getrusage_base", "getrusage@", "BASE");
+DEFINE_LIBROOT_KERNEL_SYMBOL_VERSION("_getrusage_current", "getrusage@@",
+	"1_BETA3");