Tarea_1

Makefile

@@ -139,6 +139,8 @@ UPROGS=\
 	$U/_grind\
 	$U/_wc\
 	$U/_zombie\
+	$U/_getppid_t1\
+
 
 fs.img: mkfs/mkfs README $(UPROGS)
 	mkfs/mkfs fs.img README $(UPROGS)

kernel/syscall.c

@@ -101,6 +101,7 @@ extern uint64 sys_unlink(void);
 extern uint64 sys_link(void);
 extern uint64 sys_mkdir(void);
 extern uint64 sys_close(void);
+extern uint64 sys_getppid(void);
 
 // An array mapping syscall numbers from syscall.h
 // to the function that handles the system call.
@@ -126,6 +127,7 @@ static uint64 (*syscalls[])(void) = {
 [SYS_link]    sys_link,
 [SYS_mkdir]   sys_mkdir,
 [SYS_close]   sys_close,
+[SYS_getppid] sys_getppid,
 };
 
 void

kernel/syscall.h

@@ -1,22 +1,24 @@
 // System call numbers
-#define SYS_fork    1
-#define SYS_exit    2
-#define SYS_wait    3
-#define SYS_pipe    4
-#define SYS_read    5
-#define SYS_kill    6
-#define SYS_exec    7
-#define SYS_fstat   8
-#define SYS_chdir   9
-#define SYS_dup    10
-#define SYS_getpid 11
-#define SYS_sbrk   12
-#define SYS_sleep  13
-#define SYS_uptime 14
-#define SYS_open   15
-#define SYS_write  16
-#define SYS_mknod  17
-#define SYS_unlink 18
-#define SYS_link   19
-#define SYS_mkdir  20
-#define SYS_close  21
+#define SYS_fork         1
+#define SYS_exit         2
+#define SYS_wait         3
+#define SYS_pipe         4
+#define SYS_read         5
+#define SYS_kill         6
+#define SYS_exec         7
+#define SYS_fstat        8
+#define SYS_chdir        9
+#define SYS_dup         10
+#define SYS_getpid      11
+#define SYS_sbrk        12
+#define SYS_sleep       13
+#define SYS_uptime      14
+#define SYS_open        15
+#define SYS_write       16
+#define SYS_mknod       17
+#define SYS_unlink      18
+#define SYS_link        19
+#define SYS_mkdir       20
+#define SYS_close       21
+#define SYS_getppid     22
+

kernel/sysproc.c

@@ -91,3 +91,15 @@ sys_uptime(void)
   release(&tickslock);
   return xticks;
 }
+
+uint64
+sys_getppid(void)
+{
+    struct proc *curproc = myproc();
+    if (curproc->parent) {
+        printf("Proceso actual: %d\n", curproc->pid);
+        return curproc->parent->pid;
+    }
+    printf("Error: proceso padre no encontrado\n");
+    return -1;
+}

user/getppid_t1.c

@@ -0,0 +1,10 @@
+#include "kernel/types.h"
+#include "user/user.h"
+
+int
+main(void) {
+    int ppid = getppid();
+    printf("El ID del proceso padre es: %d\n", ppid);
+    exit(0);
+}
+

user/user.h

@@ -22,6 +22,7 @@ int getpid(void);
 char* sbrk(int);
 int sleep(int);
 int uptime(void);
+int getppid(void);
 
 // ulib.c
 int stat(const char*, struct stat*);

user/usys.pl

@@ -36,3 +36,4 @@ sub entry {
 entry("sbrk");
 entry("sleep");
 entry("uptime");
+entry("getppid");