Use (new) FILE_RETRY_ERRNO() macro to decide to retry sopen()

also retrying fread() and chsize(), but that seems harmless.

src/sbbs3/nopen.c

@@ -48,7 +48,7 @@ int nopen(const char* str, uint access)
 		access|=O_BINARY;
 #endif
     while(((file=sopen(str,access,share,DEFFILEMODE))==-1)
-        && (errno==EACCES || errno==EAGAIN || errno==EDEADLOCK) && count++<LOOP_NOPEN)
+        && FILE_RETRY_ERRNO(errno) && count++<LOOP_NOPEN)
 		SLEEP((count / 10) * 100);
     return(file);
 }

src/smblib/smbfile.c

@@ -84,7 +84,7 @@ size_t smb_fread(smb_t* smb, void* buf, size_t bytes, FILE* fp)
 	while(1) {
 		if((ret=fread(buf,sizeof(char),bytes,fp))==bytes)
 			return(ret);
-		if(feof(fp) || (get_errno()!=EDEADLOCK && get_errno()!=EACCES))
+		if(feof(fp) || !FILE_RETRY_ERRNO(get_errno()))
 			return(ret);
 		if(!start)
 			start=time(NULL);
@@ -144,7 +144,7 @@ int smb_open_fp(smb_t* smb, FILE** fp, int share)
 	while(1) {
 		if((file=sopen(path,O_RDWR|O_CREAT|O_BINARY,share,DEFFILEMODE))!=-1)
 			break;
-		if(get_errno()!=EACCES && get_errno()!=EAGAIN) {
+		if(!FILE_RETRY_ERRNO(get_errno())) {
 			safe_snprintf(smb->last_error,sizeof(smb->last_error)
 				,"%s %d '%s' opening %s", __FUNCTION__
 				,get_errno(),strerror(get_errno()),path);

src/smblib/smblib.c

@@ -240,7 +240,7 @@ int smb_trunchdr(smb_t* smb)
 	while(1) {
 		if(chsize(fileno(smb->shd_fp),0L)==0)
 			break;
-		if(get_errno()!=EACCES && get_errno()!=EAGAIN) {
+		if(!FILE_RETRY_ERRNO(get_errno())) {
 			safe_snprintf(smb->last_error,sizeof(smb->last_error)
 				,"%s %d '%s' changing header file size", __FUNCTION__
 				,get_errno(),strerror(get_errno()));
@@ -1510,7 +1510,7 @@ int smb_addcrc(smb_t* smb, uint32_t crc)
 	while(1) {
 		if((file=sopen(str,O_RDWR|O_CREAT|O_BINARY,SH_DENYRW, DEFFILEMODE))!=-1)
 			break;
-		if(get_errno()!=EACCES && get_errno()!=EAGAIN) {
+		if(!FILE_RETRY_ERRNO(get_errno())) {
 			safe_snprintf(smb->last_error,sizeof(smb->last_error)
 				,"%s %d '%s' opening %s", __FUNCTION__
 				,get_errno(),strerror(get_errno()),str);