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feat: fix file rename implementation

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This commit is contained in:
Daniel Hammer
2026-03-25 07:18:13 +01:00
parent f3ea22935f
commit 5918dc4ee5
10 changed files with 360 additions and 33 deletions
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programs/lib/libc/libc.c
+2 -33
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@@ -95,6 +95,7 @@ static inline long _zos_syscall4(long nr, long a1, long a2, long a3, long a4) {
#define SYS_FCREATE 42
#define SYS_FDELETE 77
#define SYS_FMKDIR 78
#define SYS_FRENAME 94
/* ========================================================================
errno
@@ -1217,40 +1218,8 @@ int remove(const char *path) {
}
int rename(const char *oldpath, const char *newpath) {
/* No atomic rename syscall -- copy + delete */
if (oldpath == NULL || newpath == NULL) return -1;
int src = (int)_zos_syscall1(SYS_OPEN, (long)oldpath);
if (src < 0) return -1;
unsigned long sz = (unsigned long)_zos_syscall1(SYS_GETSIZE, (long)src);
/* Create destination */
_zos_syscall1(SYS_FDELETE, (long)newpath);
int dst = (int)_zos_syscall1(SYS_FCREATE, (long)newpath);
if (dst < 0) {
_zos_syscall1(SYS_CLOSE, (long)src);
return -1;
}
/* Copy in chunks */
char copybuf[4096];
unsigned long off = 0;
while (off < sz) {
unsigned long chunk = sz - off;
if (chunk > sizeof(copybuf)) chunk = sizeof(copybuf);
int r = (int)_zos_syscall4(SYS_READ, (long)src,
(long)copybuf, (long)off, (long)chunk);
if (r <= 0) break;
_zos_syscall4(SYS_FWRITE, (long)dst,
(long)copybuf, (long)off, (long)r);
off += (unsigned long)r;
}
_zos_syscall1(SYS_CLOSE, (long)src);
_zos_syscall1(SYS_CLOSE, (long)dst);
_zos_syscall1(SYS_FDELETE, (long)oldpath);
return 0;
return (int)_zos_syscall2(SYS_FRENAME, (long)oldpath, (long)newpath);
}
void perror(const char *s) {