PROFIL(2) System Calls Manual PROFIL(2)NAME
profil - execution time profile
SYNOPSIS
profil(buff, bufsiz, offset, scale)
char *buff;
int bufsiz, offset, scale;
DESCRIPTION
Buff points to an area of core whose length (in bytes) is given by bufsiz. After this call, the user's program counter (pc) is examined
each clock tick (60th second); offset is subtracted from it, and the result multiplied by scale. If the resulting number corresponds to a
word inside buff, that word is incremented.
The scale is interpreted as an unsigned, fixed-point fraction with binary point at the left: 0177777(8) gives a 1-1 mapping of pc's to
words in buff; 077777(8) maps each pair of instruction words together. 02(8) maps all instructions onto the beginning of buff (producing a
non-interrupting core clock).
Profiling is turned off by giving a scale of 0 or 1. It is rendered ineffective by giving a bufsiz of 0. Profiling is turned off when an
exec is executed, but remains on in child and parent both after a fork. Profiling may be turned off if an update in buff would cause a
memory fault.
SEE ALSO monitor(3), prof(1)ASSEMBLER
(profil = 44.)
sys profil; buff; bufsiz; offset; scale
PROFIL(2)
Check Out this Related Man Page
PROFIL(2) System Calls Manual PROFIL(2)NAME
profil - execution time profile
SYNOPSIS
profil(buff, bufsiz, offset, scale)
char *buff;
int bufsiz, offset, scale;
DESCRIPTION
Buff points to an area of core whose length (in bytes) is given by bufsiz. After this call, the user's program counter (pc) is examined
each clock tick (VAX and TAHOE: 100 ticks/second = 10 milliseconds per tick; 60 ticks/second ~= 16 milliseconds per tick); offset is sub-
tracted from it, and the result multiplied by scale. If the resulting number corresponds to a word inside buff, that word is incremented.
The scale is interpreted as an unsigned, fixed-point fraction with 16 bits of fraction: 0xffff gives a 1-1 mapping of pc's to words in
buff; 0x7fff maps each pair of instruction words together.
Profiling is turned off by giving a scale of 0 or 1. It is rendered ineffective by giving a bufsiz of 0. Profiling is turned off when an
execve is executed, but remains on in child and parent both after a fork. Profiling is turned off if an update in buff would cause a mem-
ory fault.
RETURN VALUE
A 0, indicating success, is always returned.
SEE ALSO gprof(1), prof(1), setitimer(2), monitor(3)3rd Berkeley Distribution May 6, 1987 PROFIL(2)
I'm at a total loss how to attack this problem.
I have a file that contains
ab
What I need to do is if
1)if the string "ab" doesn't contain a newline, I need to insert one back into the buffer.
2)If the file contains two consecutive blank lines, skip over it.
Here is what I started
... (5 Replies)
Can someone explain to me please why the scale=3 fails to give me an answer to 3 decimal places in the first example of calling bc below but succeeds in the second?
I know I can use a printf modifier to get the answer to 3 decimal places but I'd like to understand what's going on with bc.
... (8 Replies)
I have two programs, DriverScale.c and scale9.c. DriverScale.c calls scale 9.c which sends a W and a carraige return to the scale which SHOULD return the weight to DriverScale. However scale 9 hangs for at least 10 min, and then finally returns the weight.
Compilation:
... (8 Replies)