strace Use Example - The Networked Client (Cont.)

Next the terminal (attached to standard input, whose file descriptor is normally 0) is messed up with:

ioctl(0, SNDCTL_TMR_TIMEBASE, {B38400 opost isig icanon echo ...}) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE, {B38400 opost isig icanon echo ...}) = 0
readlink("/proc/self/fd/0", "/dev/pts/6", 511) = 10

And now, the 'utmp' file is accessed - perhaps to find our login name? ('man utmp' for more info):

access("/var/run/utmpx", F_OK)          = -1 ENOENT (No such file or directory)
open("/var/run/utmp", O_RDWR)           = -1 EACCES (Permission denied)
open("/var/run/utmp", O_RDONLY)         = 3
fcntl64(3, F_GETFD)                     = 0
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
_llseek(3, 0, [0], SEEK_SET)            = 0
alarm(0)                                = 0
rt_sigaction(SIGALRM, {0x4018a51c, [], 0x4000000}, {SIG_DFL}, 8) = 0
alarm(1)                                = 0
fcntl64(3, F_SETLKW, {type=F_RDLCK, whence=SEEK_SET, start=0, len=0}) = 0
read(3, "\10\0\0\0\t\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 384) = 384
read(3, "\2\0\0\0\0\0\0\0~\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 384) = 384
[.. snip ..]
read(3, "\7\0\0\0\23\5\0\0pts/6\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 384) = 384
fcntl64(3, F_SETLKW, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) = 0
rt_sigaction(SIGALRM, {SIG_DFL}, NULL, 8) = 0
alarm(0)                                = 1
close(3)                                = 0