12-14-2008
pipe-fork-execve
Hi everyone , after a pipe() system call i've forked and entred into the child process to execve a shell script .the problem here is that when the execve sys call fail , i want to send the error code (eg errno) to the parent process using the pipe writer side p[1] , there is nothing received in the reader-side of the parent process , checkout:
int p[2];
pid_t pid;
pipe(p);
pid = fork();
if( pid < 1 ){
/* bla bla */
close(p[0]);
close(p[1]);
return ;
}
if( pid == 0 ){
close(p[0]);
fcntl(p[1],F_SETFD,0) ; /* do not close on exec */
execve("/bin/sh",arg,env);
int err = errno;
write(p[1],&err,sizeof(int)); /* why there is nothing received in my parent process */
_exit(127);
}
/* parent process */
close(p[1]);
if( read(p[0],&code,sizeof(int) ) < 0){
perror("nothing received");
/* this is true even if the execve() fail and there is something sent.. why */
}
Any one can help..thanks
Last edited by xtremejames183; 12-14-2008 at 07:51 PM..
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fork(2) System Calls Manual fork(2)
Name
fork - create a new process
Syntax
#include <sys/types.h>
#include <unistd.h>
pid = fork()
pid_t pid;
Description
The system call causes creation of a new process. The new process (child process) is an exact copy of the calling process except for the
following:
o The child process has a unique process ID.
o The child process has a different parent process ID (that is, the process ID of the parent process).
o The child process has its own copy of the parent's descriptors. These descriptors reference the same underlying objects, so that, for
instance, file pointers in file objects are shared between the child and the parent, so that a on a descriptor in the child process
can affect a subsequent read or write by the parent. This descriptor copying is also used by the shell to establish standard input
and output for newly created processes as well as to set up pipes.
o The child processes resource utilizations are set to 0. For further information, see
Return Values
Upon successful completion, returns a value of 0 to the child process and returns the process ID of the child process to the parent
process. Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to
indicate the error.
Diagnostics
The system call fails and no child process are created under the following conditions:
[EAGAIN] The system-imposed limit {PROC_MAX} on the total number of processes under execution would be exceeded.
[EAGAIN] The system-imposed limit {CHILD_MAX} on the total number of processes under execution by a single user would be exceeded.
[ENOMEM] There is insufficient swap space for the new process.
See Also
execve(2), wait(2)
fork(2)