linux-kernel - [PATCH v2] getdents.2: Use appropriate types

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Message-Id: <20201029134210.191970-1-colomar.6.4.3@gmail.com>
Date:   Thu, 29 Oct 2020 14:42:11 +0100
From:   Alejandro Colomar <colomar.6.4.3@...il.com>
To:     mtk.manpages@...il.com
Cc:     Alejandro Colomar <colomar.6.4.3@...il.com>,
        linux-man@...r.kernel.org, linux-kernel@...r.kernel.org,
        libc-alpha@...rceware.org
Subject: [PATCH v2] getdents.2: Use appropriate types

getdents():
This function has no glibc wrapper.
As such, we should use the same types the Linux kernel uses:
Use 'long' as the return type.

getdents64():
The glibc wrapper uses ssize_t for the return type,
and 'size_t' for the count argument.

Signed-off-by: Alejandro Colomar <colomar.6.4.3@...il.com>
---
 man2/getdents.2 | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/man2/getdents.2 b/man2/getdents.2
index a187fbcef..e14627e6e 100644
--- a/man2/getdents.2
+++ b/man2/getdents.2
@@ -33,14 +33,14 @@
 getdents, getdents64 \- get directory entries
 .SH SYNOPSIS
 .nf
-.BI "int getdents(unsigned int " fd ", struct linux_dirent *" dirp ,
+.BI "long getdents(unsigned int " fd ", struct linux_dirent *" dirp ,
 .BI "             unsigned int " count );
 .PP
 .BR "#define _GNU_SOURCE" "        /* See feature_test_macros(7) */"
 .B #include <dirent.h>
 .PP
-.BI "int getdents64(unsigned int " fd ", struct linux_dirent64 *" dirp ,
-.BI "             unsigned int " count );
+.BI "ssize_t getdents64(unsigned int " fd ", struct linux_dirent64 *" dirp ,
+.BI "             size_t " count );
 .fi
 .PP
 .IR Note :
@@ -282,7 +282,8 @@ struct linux_dirent {
 int
 main(int argc, char *argv[])
 {
-    int fd, nread;
+    int fd;
+    long nread;
     char buf[BUF_SIZE];
     struct linux_dirent *d;
     char d_type;
@@ -301,7 +302,7 @@ main(int argc, char *argv[])
 
         printf("\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- nread=%d \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\en", nread);
         printf("inode#    file type  d_reclen  d_off   d_name\en");
-        for (int bpos = 0; bpos < nread;) {
+        for (long bpos = 0; bpos < nread;) {
             d = (struct linux_dirent *) (buf + bpos);
             printf("%8ld  ", d\->d_ino);
             d_type = *(buf + bpos + d\->d_reclen \- 1);
-- 
2.28.0