What I'm seeing is an infinite loop of the following (using /usr/bin/head):
> truss  -u libc head -c 1 /dev/zero
> ...
> /1@1: -> libc:fgets(0x8047680, 0x400, 0x80622b0, 0x0)
> /1:   read(3, "\0\0\0\0\0\0\0\0\0\0\0\0".., 8192)     = 8192
> /1@1: <- libc:fgets() = 0x8047680
> /1@1: -> libc:strlen()
> /1@1: <- libc:strlen() = 0
> /1@1: -> libc:printf()
> /1@1: <- libc:printf() = 0
> /1@1: -> libc:fflush(0x8062290, 0x8047680, 0x80622b0, 0x0)
> /1@1: <- libc:fflush() = 0
> /1@1: -> libc:fgets(0x8047680, 0x400, 0x80622b0, 0x0)
> /1@1: <- libc:fgets() = 0x8047680
> /1@1: -> libc:strlen()
> /1@1: <- libc:strlen() = 0
> /1@1: -> libc:printf()
> /1@1: <- libc:printf() = 0
> /1@1: -> libc:fflush(0x8062290, 0x8047680, 0x80622b0, 0x0)
> /1@1: <- libc:fflush() = 0
> /1@1: -> libc:fgets(0x8047680, 0x400, 0x80622b0, 0x0)
> /1@1: <- libc:fgets() = 0x8047680
> /1@1: -> libc:strlen()
> /1@1: <- libc:strlen() = 0
> /1@1: -> libc:printf()
> /1@1: <- libc:printf() = 0
> /1@1: -> libc:fflush(0x8062290, 0x8047680, 0x80622b0, 0x0)
> /1@1: <- libc:fflush() = 0
> /1@1: -> libc:fgets(0x8047680, 0x400, 0x80622b0, 0x0)
> /1@1: <- libc:fgets() = 0x8047680
> /1@1: -> libc:strlen()
> /1@1: <- libc:strlen() = 0
> /1@1: -> libc:printf()
> /1@1: <- libc:printf() = 0
> /1@1: -> libc:fflush(0x8062290, 0x8047680, 0x80622b0, 0x0)
> /1@1: <- libc:fflush() = 0
> /1@1: -> libc:fgets(0x8047680, 0x400, 0x80622b0, 0x0)
> /1@1: <- libc:fgets() = 0x8047680
> /1@1: -> libc:strlen()
> /1@1: <- libc:strlen() = 0
> /1@1: -> libc:printf()
> /1@1: <- libc:printf() = 0
> /1@1: -> libc:fflush(0x8062290, 0x8047680, 0x80622b0, 0x0)
> /1@1: <- libc:fflush() = 0
> /1@1: -> libc:fgets(0x8047680, 0x400, 0x80622b0, 0x0)
> /1@1: <- libc:fgets() = 0x8047680
> /1@1: -> libc:strlen()
> /1@1: <- libc:strlen() = 0
> /1@1: -> libc:printf()
> /1@1: <- libc:printf() = 0
> /1@1: -> libc:fflush(0x8062290, 0x8047680, 0x80622b0, 0x0)
> /1@1: <- libc:fflush() = 0
> /1@1: -> libc:fgets(0x8047680, 0x400, 0x80622b0, 0x0)
> /1@1: <- libc:fgets() = 0x8047680
> /1@1: -> libc:strlen()
> /1@1: <- libc:strlen() = 0
> /1@1: -> libc:printf()
> /1@1: <- libc:printf() = 0
> /1@1: -> libc:fflush(0x8062290, 0x8047680, 0x80622b0, 0x0)
> /1@1: <- libc:fflush() = 0
> /1@1: -> libc:fgets(0x8047680, 0x400, 0x80622b0, 0x0)
> /1@1: <- libc:fgets() = 0x8047680
> /1@1: -> libc:strlen()
> /1@1: <- libc:strlen() = 0
> /1@1: -> libc:printf()
> /1@1: <- libc:printf() = 0
> /1@1: -> libc:fflush(0x8062290, 0x8047680, 0x80622b0, 0x0)
> /1@1: <- libc:fflush() = 0
> ...
and again and again


-- 
Richard PALO



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