diff mbox series

[v3] getdents.2: Use appropriate types

Message ID 20201029141053.195998-1-colomar.6.4.3@gmail.com
State Not applicable
Headers
Series [v3] getdents.2: Use appropriate types |

Commit Message

Alejandro Colomar Oct. 29, 2020, 2:10 p.m. UTC 
  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 getdents64(int, void *, size_t);

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
---

Hi Michael,

Sorry, I'm being a bit distracted these days :)
It should be good enough now, I think.

Cheers,

Alex

 man2/getdents.2 | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

Comments

Michael Kerrisk \(man-pages\) Oct. 29, 2020, 7:54 p.m. UTC | #1 
On 10/29/20 3:10 PM, Alejandro Colomar wrote:
> 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 getdents64(int, void *, size_t);
> 
> Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>

Thanks, Alex. Applied.

Cheers,

Michael


> ---
> 
> Hi Michael,
> 
> Sorry, I'm being a bit distracted these days :)
> It should be good enough now, I think.
> 
> Cheers,
> 
> Alex
> 
>  man2/getdents.2 | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/man2/getdents.2 b/man2/getdents.2
> index a187fbcef..ed3bb40b1 100644
> --- a/man2/getdents.2
> +++ b/man2/getdents.2
> @@ -33,14 +33,13 @@
>  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(int " fd ", void *" dirp ", size_t " count );
>  .fi
>  .PP
>  .IR Note :
> @@ -282,7 +281,8 @@ 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 +301,7 @@ 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);
>
diff mbox series

Patch

diff --git a/man2/getdents.2 b/man2/getdents.2
index a187fbcef..ed3bb40b1 100644
--- a/man2/getdents.2
+++ b/man2/getdents.2
@@ -33,14 +33,13 @@ 
 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(int " fd ", void *" dirp ", size_t " count );
 .fi
 .PP
 .IR Note :
@@ -282,7 +281,8 @@  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 +301,7 @@  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);