libposix: add dup, dup2, getrusage, fstat and lstat

sys/include/posix.h

@@ -82,11 +82,21 @@ struct __attribute__((__packed__)) dirent
 
 typedef unsigned long clock_t;
 
+typedef enum PosixRUsages
+{
+	PosixRUsageSelf = 0,
+	PosixRUsageChildren = 1,
+
+	PosixRUsageUnknown = -1
+} PosixRUsages;
+
 #define __POSIX_EXIT_PREFIX "posix error "
 #define __POSIX_EXIT_SIGNAL_PREFIX "terminated by posix signal "
 #define __POSIX_SIGNAL_PREFIX "posix: "
 
 extern int POSIX_access(int *errnop, const char *path, int amode);
+extern int POSIX_dup(int *errnop, int fildes);
+extern int POSIX_dup2(int *errnop, int fildes, int fildes2);
 extern void POSIX_exit(int code) __attribute__((noreturn));
 extern int POSIX_chmod(int *errnop, const char *path, int mode);
 extern int POSIX_fchmodat(int *errnop, int fd, const char *path, long mode, int flag);
@@ -99,7 +109,7 @@ extern int POSIX_mkdir(int *errnop, const char *path, int mode);
 extern int POSIX_close(int *errnop, int file);
 extern int POSIX_execve(int *errnop, const char *name, char * const*argv, char * const*env);
 extern int POSIX_fork(int *errnop);
-extern int POSIX_fstat(int *errnop, int file, void *stat);
+extern int POSIX_getrusage(int *errnop, PosixRUsages who, void *r_usage);
 extern char* POSIX_getcwd(int *errnop, char *buf, int size);
 extern char* POSIX_getlogin(int *errnop);
 extern int POSIX_getlogin_r(int *errnop, char *name, int namesize);
@@ -115,6 +125,8 @@ extern long POSIX_pread(int *errnop, int fd, char *buf, size_t len, long offset)
 extern long POSIX_pwrite(int *errnop, int fd, const char *buf, size_t len, long offset);
 extern long POSIX_read(int *errnop, int fd, char *buf, size_t len);
 extern int POSIX_stat(int *errnop, const char *file, void *stat);
+extern int POSIX_fstat(int *errnop, int file, void *stat);
+extern int POSIX_lstat(int *errnop, const char *file, void *stat);
 extern clock_t POSIX_times(int *errnop, void *tms);
 extern int POSIX_unlink(int *errnop, const char *name);
 extern int POSIX_wait(int *errnop, int *status);

sys/src/lib/posix/files.c

@@ -153,6 +153,38 @@ AccessDone:
 	return -1;
 }
 
+int
+POSIX_dup2(int *errnop, int fildes, int fildes2)
+{
+	int newfd;
+	if(fildes < 0 || fildes2 < 0){
+		*errnop = __libposix_get_errno(PosixEBADF);
+		return -1;
+	}
+	newfd = dup(fildes, fildes2);
+	if(newfd < 0){
+		*errnop = __libposix_get_errno(PosixEINTR);
+		return -1;
+	}
+	return newfd;
+}
+
+int
+POSIX_dup(int *errnop, int fildes)
+{
+	int newfd;
+	if(fildes < 0){
+		*errnop = __libposix_get_errno(PosixEBADF);
+		return -1;
+	}
+	newfd = dup(fildes, -1);
+	if(newfd < 0){
+		*errnop = __libposix_get_errno(PosixEBADF);
+		return -1;
+	}
+	return newfd;
+}
+
 int
 POSIX_pipe(int *errnop, int fildes[2])
 {
@@ -427,6 +459,12 @@ POSIX_stat(int *errnop, const char *file, void *pstat)
 	return -1;
 }
 
+int
+POSIX_lstat(int *errnop, const char *file, void *pstat)
+{
+	return POSIX_stat(errnop, file, pstat);
+}
+
 int
 POSIX_chmod(int *errnop, const char *path, int mode)
 {

sys/src/lib/posix/processes.c

@@ -28,6 +28,17 @@ ChildList **__libposix_child_list;
 static PosixExitStatusTranslator __libposix_exit_status_translator;
 static int __libposix_wnohang;
 
+struct timeval {
+	unsigned int tv_sec;
+	unsigned int tv_usec;
+};
+
+struct rusage {
+  	struct timeval ru_utime;	/* user time used */
+	struct timeval ru_stime;	/* system time used */
+	struct timeval ru_etime;	/* real elapsed time */
+};
+
 #define __POSIX_SIGNAL_PREFIX_LEN (sizeof(__POSIX_SIGNAL_PREFIX)-1)
 
 static int
@@ -138,6 +149,32 @@ POSIX_exit(int code)
 	exits(buf);
 }
 
+int
+POSIX_getrusage(int *errnop, PosixRUsages who, void *r_usagep)
+{
+	int32_t t[4];
+	struct rusage *r_usage = r_usagep;
+
+	times(&t[0]);
+	switch(who){
+	case PosixRUsageSelf:
+		r_usage->ru_utime.tv_sec = t[0]/1000;
+		r_usage->ru_utime.tv_sec = (t[0]%1000)*1000;
+		r_usage->ru_stime.tv_sec = t[1]/1000;
+		r_usage->ru_stime.tv_sec = (t[1]%1000)*1000;
+		return 0;
+	case PosixRUsageChildren:
+		r_usage->ru_utime.tv_sec = t[2]/1000;
+		r_usage->ru_utime.tv_sec = (t[2]%1000)*1000;
+		r_usage->ru_stime.tv_sec = t[3]/1000;
+		r_usage->ru_stime.tv_sec = (t[3]%1000)*1000;
+		return 0;
+	default:
+		*errnop = __libposix_get_errno(PosixEINVAL);
+		return -1;
+	}
+}
+
 int
 POSIX_execve(int *errnop, const char *name, char * const*argv, char * const*env)
 {