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Description of problem:
getservbyname("nfsrdma", "tcp") should return
name 'nfsrdma' port 20049 proto 'tcp'
since that is one of the 3 nfsrdma entries in /etc/services
$ grep nfsrdma /etc/services
nfsrdma 20049/tcp # Network File System (NFS) over RDMA
nfsrdma 20049/udp # Network File System (NFS) over RDMA
nfsrdma 20049/sctp # Network File System (NFS) over RDMA
but these are the values being returned
name 'nfsrdma' port 20814 proto 'tcp'
and you will note port 20814 does not exist
in /etc/sevices
Version-Release number of selected component (if applicable):
glibc-2.17-105.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1.Use the following reproducer
#include <stdio.h>
#include <netdb.h>
main()
{
struct servent *sv = getservbyname("nfsrdma", "tcp");
if (sv)
printf("name '%s' port %d proto '%s'\n",
sv->s_name, sv->s_port, sv->s_proto);
}
The returned port number is in network byte order. Use this instead:
#include <stdio.h>
#include <netdb.h>
main()
{
struct servent *sv = getservbyname("nfsrdma", "tcp");
if (sv)
printf("name '%s' port %d proto '%s'\n",
sv->s_name, ntohs(sv->s_port), sv->s_proto);
}
It's unfortunate the two numbers are so close together, otherwise it would be easier to spot the mistake.
(In reply to Florian Weimer from comment #2)
> The returned port number is in network byte order. Use this instead:
>
> #include <stdio.h>
> #include <netdb.h>
>
> main()
> {
> struct servent *sv = getservbyname("nfsrdma", "tcp");
>
> if (sv)
> printf("name '%s' port %d proto '%s'\n",
> sv->s_name, ntohs(sv->s_port), sv->s_proto);
> }
>
> It's unfortunate the two numbers are so close together, otherwise it would
> be easier to spot the mistake.
Ah... Perfect... Thanks you!!!
Description of problem: getservbyname("nfsrdma", "tcp") should return name 'nfsrdma' port 20049 proto 'tcp' since that is one of the 3 nfsrdma entries in /etc/services $ grep nfsrdma /etc/services nfsrdma 20049/tcp # Network File System (NFS) over RDMA nfsrdma 20049/udp # Network File System (NFS) over RDMA nfsrdma 20049/sctp # Network File System (NFS) over RDMA but these are the values being returned name 'nfsrdma' port 20814 proto 'tcp' and you will note port 20814 does not exist in /etc/sevices Version-Release number of selected component (if applicable): glibc-2.17-105.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.Use the following reproducer #include <stdio.h> #include <netdb.h> main() { struct servent *sv = getservbyname("nfsrdma", "tcp"); if (sv) printf("name '%s' port %d proto '%s'\n", sv->s_name, sv->s_port, sv->s_proto); }