[root@localhost logs]# strace -s 5000 httpd -X

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bind(4, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("0.0.0.0")}, 16) = -1 EADDRINUSE (Address already in use)
write(2, "(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80\n", 76(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
) = 76
close(4)                                = 0
write(2, "no listening sockets available, shutting down\n", 46no listening sockets available, shutting down
) = 46
write(2, "Unable to open logs\n", 20Unable to open logs
)   = 20
munmap(0x196000, 443492)                = 0
munmap(0x114000, 531664)                = 0
brk(0x832b000)                          = 0x832b000
exit_group(1)                           = ?
Process 8143 detached