Detect asprintf's ENOMEM in procfs.c rather than everywhere

* procfs.h: Make CONTENTS_LEN an ssize_t rather than a size_t,
  and document the change.
* procfs.c (procfs_get_contents): Initialize CONTENTS_LEN to a
  negative value, and fail with ENOMEM if it's still negative after the
  callback returns.  (everywhere): Update to ssize_t.
* dircat.c, netfs.c, process.c,
  procfs_dir.c, proclist.c, rootdir.c: Update to
  ssize_t and the new GET_CONTENTS semantics.

1 files changed, 4 insertions, 4 deletions

diff --git a/netfs.c b/netfs.c
index 6fd82a00..e41e0623 100644
--- a/netfs.c
+++ b/netfs.c
@@ -30,7 +30,7 @@ int netfs_maxsymlinks = PROCFS_MAXSYMLINKS;
 error_t netfs_validate_stat (struct node *np, struct iouser *cred)
 {
   char *contents;
-  size_t contents_len;
+  ssize_t contents_len;
   error_t err;
 
   /* Only symlinks need to have their size filled, before a read is
@@ -54,7 +54,7 @@ error_t netfs_attempt_read (struct iouser *cred, struct node *np,
 			    loff_t offset, size_t *len, void *data)
 {
   char *contents;
-  size_t contents_len;
+  ssize_t contents_len;
   error_t err;
 
   err = procfs_get_contents (np, &contents, &contents_len);
@@ -79,7 +79,7 @@ error_t netfs_attempt_readlink (struct iouser *user, struct node *np,
 				char *buf)
 {
   char *contents;
-  size_t contents_len;
+  ssize_t contents_len;
   error_t err;
 
   err = procfs_get_contents (np, &contents, &contents_len);
@@ -137,7 +137,7 @@ error_t netfs_get_dirents (struct iouser *cred, struct node *dir,
 			   vm_size_t bufsize, int *amt)
 {
   char *contents;
-  size_t contents_len;
+  ssize_t contents_len;
   error_t err;
  
   err = procfs_get_contents (dir, &contents, &contents_len);