Well open() returns an integer, which if -1 means errno is set to tell you what you did wrong. It sounds like your access in not good. You can set errno to zero before and test afterward. The nature of errno is that it is only set for errors, not reset on success. I usually:
I need to write a function that will work in sh/ksh shell that will test to see if a file has already been opened for writting by another user
has anyone written something like this? (3 Replies)
timbass
Sat, 28 Jul 2007 10:07:53 +0000
Originally posted in Yahoo! CEP-Interest
Here is my follow-up note on posets (partially ordered sets) and tosets (totally or linearly ordered sets) as background set theory for event processing, and in particular CEP and ESP.
In my last note, we... (0 Replies)
We are a tool vendor and one of our users is getting this error.
The user is using several macrovision(FLEXLM) license enabled products including ours.
(lmgrd) Can't open /usr/tmp/.flexlm/lmgrdl.4081, errno: 24
At this time, it stops checking out licenses, and will not
respond to query's.... (2 Replies)
Hey, Can I assume that for certain function calls, errno can never be set to a certain value.
More specifically, can I assume that for if the stat function call fails, the errno can never be or "No space left on device."
I am assuming that a read function cannot fail because of no space... (5 Replies)
To begin:
I use Linux
The Problem:
I need bcp functionality for scripts. Perl modules, such as Sybase:xfer, require ctlib which comes with Sybase Open Client. Talking with Sybase sales
reps is an exercise in futility and hate. They know absolutely nothing about their own products and will... (0 Replies)
If a process already has the entire file locked for read and write using newstruct.l_type = F_WRLCK; what would happen if another process would try to open it in read only mode using open(filename, O_RDONLY); ?
I want to check if the file exists and I want it to work even if another process has... (4 Replies)
Help Please perl Gurus,
I am trying to add ungrouped passengers in a group and I creating a script however it fails on first step only I tried all the options it returns following error.
syntax error at junki line 4, near "open "
Execution of junki aborted due to compilation errors. ... (2 Replies)
Hello all, just a quick little part of code i'm writing to check if the file i'm writing too in my automatic process is not being written too manually.
#!/bin/bash
FUSER=$(/sbin/fuser -s /toto.tmp >/dev/null 2>&1)
LSOF=$(/usr/sbin/lsof | grep -q "toto.tmp")
PGREP=$(pgrep -f "toto.tmp" >... (6 Replies)
Hi,
Unable to make tape backup, please help.
/opt/ignite/bin/make_tape_recovery -a /dev/rmt/?mn -I -v -m tar -x inc_entire=vg00
* Creating local directories for configuration files and archive.
======= 04/25/16 16:28:08 IST Started /opt/ignite/bin/make_tape_recovery.
(Mon... (4 Replies)
Discussion started by: anuragr
4 Replies
LEARN ABOUT REDHAT
warn
ERR(3) BSD Library Functions Manual ERR(3)NAME
err, verr, errx, verrx, warn, vwarn, warnx, vwarnx, -- formatted error messages
SYNOPSIS
#include <err.h>
void
err(int eval, const char *fmt, ...);
void
errx(int eval, const char *fmt, ...);
void
warn(const char *fmt, ...);
void
warnx(const char *fmt, ...);
#include <stdarg.h>
void
verr(int eval, const char *fmt, va_list args);
void
verrx(int eval, const char *fmt, va_list args);
void
vwarn(const char *fmt, va_list args);
void
vwarnx(const char *fmt, va_list args);
DESCRIPTION
The err() and warn() family of functions display a formatted error message on the standard error output. In all cases, the last component of
the program name, a colon character, and a space are output. If the fmt argument is not NULL, the printf(3)-like formatted error message is
output. The output is terminated by a newline character.
The err(), verr(), warn(), and vwarn() functions append an error message obtained from strerror(3) based on a code or the global variable
errno, preceded by another colon and space unless the fmt argument is NULL.
The err(), verr(), warn(), and vwarn() functions use the global variable errno to look up the error message.
The errx() and warnx() functions do not append an error message.
The err(), verr(), errx(), and verrx() functions do not return, but exit with the value of the argument eval.
EXAMPLES
Display the current errno information string and exit:
if ((p = malloc(size)) == NULL)
err(1, NULL);
if ((fd = open(file_name, O_RDONLY, 0)) == -1)
err(1, "%s", file_name);
Display an error message and exit:
if (tm.tm_hour < START_TIME)
errx(1, "too early, wait until %s", start_time_string);
Warn of an error:
if ((fd = open(raw_device, O_RDONLY, 0)) == -1)
warnx("%s: %s: trying the block device",
raw_device, strerror(errno));
if ((fd = open(block_device, O_RDONLY, 0)) == -1)
err(1, "%s", block_device);
SEE ALSO exit(3), printf(3), perror(3), strerror(3)HISTORY
The err() and warn() functions first appeared in 4.4BSD.
BSD March 6, 1999 BSD