04-05-2010
how to distinguish entry/exit of a syscall when using ptrace?
Hi all,
I am using ptrace to keep track of clone syscalls in a program. However, I found that the traced syscall cant be paired. for example, there are some syscalls that have entry, but without exit showing up in the traced sequences. So, is there anyway to distinguish the entry and exit of a system call, when using ptrace? Any idea is appreciated, thanks
Tang
10 More Discussions You Might Find Interesting
1. AIX
Hello,
In a script shell, I have a variable containing the name of a file and I would like to distinguish the name from the extention of the file. For example, the file 'myfile.txt' is in a variable called $VAR. How can I obtain 2 variables, one with 'myfile' and the other with 'txt' ?
Thank you (2 Replies)
Discussion started by: tbeghain
2 Replies
2. Programming
I have a question regarding the recv syscall.
Suppose I have a client/server and the following exchange of message took place:
Client --> Server using multiple send syscalls one after another immediately:
send "Packet1"
send "Packet2"
send "Packet3"
Server receives in the... (2 Replies)
Discussion started by: heljy
2 Replies
3. HP-UX
how to distinguish different files and choose a mode while ftp?means which modes ascii or binary for zip(.gz) ,.txt,.sh,.dat and executable as well as movie files. (1 Reply)
Discussion started by: megh
1 Replies
4. Programming
I am working on solaris 9. and use gmake to compile and linke c/c++ program.
anybody can tell me the distinguish between gmake and make? :confused: (10 Replies)
Discussion started by: robin.zhu
10 Replies
5. Programming
Hi all,
i just started started learning system programming and want to pursue a career in the sys prog area.
below is the program that use a fork() call.
i read in one of the tutorials that parent process and child process uses different address spaces and runs concurrently.
that meas each... (2 Replies)
Discussion started by: MrUser
2 Replies
6. UNIX for Dummies Questions & Answers
I saw somewhere that describe read() as a primitive. But when I lean signals, it says the read() may be interrupted by a signal.
My Question:
1, What is the diffence between primitive and reentrant?
2, Is read() a primitive or reentrant?
3, Are all system calls primitive or reentrant? (2 Replies)
Discussion started by: vistastar
2 Replies
7. SCO
Hello,
is there any command in SCO unix by which I can check if the file system is HTFS or DTFS?
Thanks (1 Reply)
Discussion started by: Mick
1 Replies
8. UNIX for Advanced & Expert Users
Hello Experts,
If a Solaris process is calling some syscall, and right now execution is inside syscall doing only CPU work, for example the inside simplest times syscall,
-> app_func
=> times
<< we are here now, we have entered in the times, but not exited yet
<= times
<- app_func... (9 Replies)
Discussion started by: sant
9 Replies
9. Programming
Hello to all
I want download a file in osx intel 64 with NASM , I want to use socket syscall
This is part of my code
section .data
command db "GET /test/2.gif HTTP/1.1\r\nHost: 10.1.1.187\r\n\r\n", 0
; url db "http://172.16.207.153/test/2.gif", 0
global main... (1 Reply)
Discussion started by: recher.jack
1 Replies
10. How to Post in the The UNIX and Linux Forums
Hi All,
Please help me and guide me to write a bash/shell script on Linux box to delete parent entry with all their child entries.
example:
Parent is :
----------
dn: email=yogesh.kumar@wipro.com, o=wipro, o=in
child is:
----------
dn: cn: yogesh kumar, email=yogesh.kumar@wipro.com,... (1 Reply)
Discussion started by: Chand
1 Replies
SYSCALL(2) Linux Programmer's Manual SYSCALL(2)
NAME
syscall - indirect system call
SYNOPSIS
#define _GNU_SOURCE /* or _BSD_SOURCE or _SVID_SOURCE */
#include <unistd.h>
#include <sys/syscall.h> /* For SYS_xxx definitions */
int syscall(int number, ...);
DESCRIPTION
syscall() performs the system call whose assembly language interface has the specified number with the specified arguments. Symbolic con-
stants for system calls can be found in the header file <sys/syscall.h>.
RETURN VALUE
The return value is defined by the system call being invoked. In general, a 0 return value indicates success. A -1 return value indicates
an error, and an error code is stored in errno.
NOTES
syscall() first appeared in 4BSD.
EXAMPLE
#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/types.h>
int
main(int argc, char *argv[])
{
pid_t tid;
tid = syscall(SYS_gettid);
}
SEE ALSO
_syscall(2), intro(2), syscalls(2)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2007-07-26 SYSCALL(2)