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genlee
n00b
Joined: 16 Apr 2003
Posts: 2
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 Posted: Wed Apr 16, 2003 1:44 am Post subject: Glibc problems |
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When calling getservbyname(), it alwys returns NULL. I have checked /etc/services and it is good. I also tried reinstalling glibc but it didn't help at all. Because of this, a lot of my services will not work now. Anyone know why?
Here is a little test I ran:
| Code: | vortex root # cat blah.c
#include <stdio.h>
#include <netdb.h>
int
main(int argc, char **argv) {
struct servent *se;
se = getservbyname(argv[1], argv[2]);
printf("%s\n", se->s_name);
return 0;
}
vortex root # ltrace ./a.out smtp tcp
__libc_start_main(0x08048378, 3, 0xbd6539b4, 0x080483d0, 0x08048400 <unfinished
...>
getservbyname("smtp", "tcp") = NULL
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++
vortex root # grep smtp /etc/services
smtp 25/tcp mail
ssmtp 465/tcp # SMTP over SSL
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cerri
Bodhisattva
Joined: 05 Mar 2003
Posts: 2957
Location: # init S
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| Posted: Wed Apr 16, 2003 4:10 am Post subject: |
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| Code: | open("/etc/services", O_RDONLY) = 3
fcntl64(3, F_GETFD) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=13521, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40
015000
read(3, "# /etc/services:\n# $Id: services"..., 4096) = 4096
close(3) = 0
munmap(0x40015000, 4096) = 0
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40
015000
write(1, "smtp\n", 5smtp
) = 5
munmap(0x40015000, 4096) = 0
_exit(0) = ?
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It works for me 
_________________
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<----------------------->
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