ok, i have another doubt on open()
i change my c-code
from
to
shouldn't open() be able to override the default permissions already set?
i tried and apparently it does not. is there any reason, besides enforcing security(that the only thing that i could think of)? and is there any way around this? (besides giving the file permissions using the system("chmod "); function?)
What does the system call "dup" do?
What is the difference between dup and dup2
I have a fair idea of what it does but I am confused when its coming down to the exact details...
Please help me!:confused: (2 Replies)
open, creat, read, write, lseek and close
Are they all primitive?
:confused:
*Another Question: is there a different between a system call, and an i/o system call? (2 Replies)
Hi,
I'm new to UNIX system calls. Can someone share your knowledge as to how exactly system calls should be executed?
Can they be typed like commands such as mkdir on the terminal itself? Also, are there any websites which will show me an example of the output to expect when a system call like... (1 Reply)
Hello,
how would i be able to call ps in C programming?
thanks,
---------- Post updated at 01:39 AM ---------- Previous update was at 01:31 AM ----------
here's the complete system call, ps -o pid -p %d, getpit() (2 Replies)
I'm currently studying for my exam, and is practicing with sample exam questions.
However there is a question asking "Name THREE UNIX Directory system calls" and the answer given is "opendir, closedir and readdir", however the next question ask "Why is a write directory system call not included... (1 Reply)
Hello...
I'm trying to setup a cronjob to record system data using glance at certain times of the day. My question is, how would one export the "Global System Calls" information to a file? Below is the command I have been using and it works to export CPU information.
glance -f ... (0 Replies)
Hi i am very new to programming in UNIX and don't understand the difference between a system call and a normal function call. Also can I implement system calls from within a program? If so could someone please give me an example of a system call from within a program. Lastly, when creating a... (1 Reply)
Discussion started by: bjhum33
1 Replies
LEARN ABOUT FREEBSD
xo_message
LIBXO(3) BSD Library Functions Manual LIBXO(3)NAME
xo_err -- emit errors and warnings in multiple formats
LIBRARY
library ``libxo''
SYNOPSIS
#include <libxo/xo.h>
void
xo_warn(const char *fmt, ...);
void
xo_warnx(const char *fmt, ...);
void
xo_warn_c(int code, const char *fmt, ...);
void
xo_warn_hc(xo_handle_t *xop, int code, const char *fmt, ...);
void
xo_err(int eval, const char *fmt, ...);
void
xo_errc(int eval, int code, const char *fmt, ...);
void
xo_errx(int eval, const char *fmt, ...);
void
xo_message(const char *fmt, ...);
void
xo_message_c(int code, const char *fmt, ...);
void
xo_message_hc(xo_handle_t *xop, int code, const char *fmt, ...);
void
xo_message_hcv(xo_handle_t *xop, int code, const char *fmt, va_list vap);
DESCRIPTION
Many programs make use of the standard library functions err(3) and warn(3) to generate errors and warnings for the user. libxo wants to
pass that information via the current output style, and provides compatible functions to allow this.
These functions display the program name, a colon, a formatted message based on the arguments, and then optionally a colon and an error mes-
sage associated with either errno or the code parameter.
EXAMPLE:
if (open(filename, O_RDONLY) < 0)
xo_err(1, "cannot open file '%s'", filename);
ADDITIONAL DOCUMENTATION
Complete documentation can be found on github:
http://juniper.github.io/libxo/libxo-manual.html
libxo lives on github as:
https://github.com/Juniper/libxo
The latest release of libxo is available at:
https://github.com/Juniper/libxo/releases
SEE ALSO xo_emit(3)HISTORY
The libxo library was added in FreeBSD 11.0.
AUTHOR
Phil Shafer
BSD December 4, 2014 BSD