From: Tulio A M Mendes <tadryanom@hotmail.com>
Date: Thu, 12 Feb 2026 02:58:41 +0000 (-0300)
Subject: feat: truncate/ftruncate syscalls (78/79) + ulibc wrappers
X-Git-Url: https://projects.tadryanom.me/?a=commitdiff_plain;h=97e566f7b770df14b58af058ca3e735a72f8ae76;p=AdrOS.git

feat: truncate/ftruncate syscalls (78/79) + ulibc wrappers
---

diff --git a/include/syscall.h b/include/syscall.h
index b6418d71..adee9486 100644
--- a/include/syscall.h
+++ b/include/syscall.h
@@ -110,6 +110,11 @@ enum {
     SYSCALL_UMASK     = 75,
     SYSCALL_SETUID    = 76,
     SYSCALL_SETGID    = 77,
+    SYSCALL_TRUNCATE  = 78,
+    SYSCALL_FTRUNCATE = 79,
+    SYSCALL_SIGSUSPEND = 80,
+    SYSCALL_READV     = 81,
+    SYSCALL_WRITEV    = 82,
 };
 
 #endif
diff --git a/src/kernel/syscall.c b/src/kernel/syscall.c
index 8fab4e38..949bd5e0 100644
--- a/src/kernel/syscall.c
+++ b/src/kernel/syscall.c
@@ -2238,7 +2238,8 @@ void syscall_handler(struct registers* regs) {
     }
 
     if (syscall_no == SYSCALL_PREAD || syscall_no == SYSCALL_PWRITE ||
-        syscall_no == SYSCALL_ACCESS) {
+        syscall_no == SYSCALL_ACCESS || syscall_no == SYSCALL_TRUNCATE ||
+        syscall_no == SYSCALL_FTRUNCATE) {
         posix_ext_syscall_dispatch(regs, syscall_no);
         return;
     }
@@ -2339,6 +2340,32 @@ static void posix_ext_syscall_dispatch(struct registers* regs, uint32_t syscall_
         return;
     }
 
+    if (syscall_no == SYSCALL_FTRUNCATE) {
+        int fd = (int)regs->ebx;
+        uint32_t length = regs->ecx;
+        struct file* f = fd_get(fd);
+        if (!f || !f->node) { regs->eax = (uint32_t)-EBADF; return; }
+        if (!(f->node->flags & FS_FILE)) { regs->eax = (uint32_t)-EINVAL; return; }
+        f->node->length = length;
+        regs->eax = 0;
+        return;
+    }
+
+    if (syscall_no == SYSCALL_TRUNCATE) {
+        const char* user_path = (const char*)regs->ebx;
+        uint32_t length = regs->ecx;
+        if (!user_path) { regs->eax = (uint32_t)-EFAULT; return; }
+        char path[128];
+        int prc = path_resolve_user(user_path, path, sizeof(path));
+        if (prc < 0) { regs->eax = (uint32_t)prc; return; }
+        fs_node_t* node = vfs_lookup(path);
+        if (!node) { regs->eax = (uint32_t)-ENOENT; return; }
+        if (!(node->flags & FS_FILE)) { regs->eax = (uint32_t)-EISDIR; return; }
+        node->length = length;
+        regs->eax = 0;
+        return;
+    }
+
     regs->eax = (uint32_t)-ENOSYS;
 }
 
diff --git a/user/ulibc/include/syscall.h b/user/ulibc/include/syscall.h
index 8404b67d..f43ab027 100644
--- a/user/ulibc/include/syscall.h
+++ b/user/ulibc/include/syscall.h
@@ -69,6 +69,11 @@ enum {
     SYS_UMASK = 75,
     SYS_SETUID = 76,
     SYS_SETGID = 77,
+    SYS_TRUNCATE = 78,
+    SYS_FTRUNCATE = 79,
+    SYS_SIGSUSPEND = 80,
+    SYS_READV = 81,
+    SYS_WRITEV = 82,
 };
 
 /* Raw syscall wrappers — up to 5 args via INT 0x80 */
diff --git a/user/ulibc/include/unistd.h b/user/ulibc/include/unistd.h
index 356780c9..af7f24df 100644
--- a/user/ulibc/include/unistd.h
+++ b/user/ulibc/include/unistd.h
@@ -49,6 +49,8 @@ int     pwrite(int fd, const void* buf, size_t count, int offset);
 int     access(const char* path, int mode);
 int     setuid(int uid);
 int     setgid(int gid);
+int     truncate(const char* path, int length);
+int     ftruncate(int fd, int length);
 void*   brk(void* addr);
 
 void    _exit(int status) __attribute__((noreturn));
diff --git a/user/ulibc/src/unistd.c b/user/ulibc/src/unistd.c
index 8e2e0d29..f1c04483 100644
--- a/user/ulibc/src/unistd.c
+++ b/user/ulibc/src/unistd.c
@@ -123,6 +123,14 @@ int setgid(int gid) {
     return __syscall_ret(_syscall1(SYS_SETGID, gid));
 }
 
+int truncate(const char* path, int length) {
+    return __syscall_ret(_syscall2(SYS_TRUNCATE, (int)path, length));
+}
+
+int ftruncate(int fd, int length) {
+    return __syscall_ret(_syscall2(SYS_FTRUNCATE, fd, length));
+}
+
 void* brk(void* addr) {
     return (void*)_syscall1(SYS_BRK, (int)addr);
 }