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Top Forums Programming How to find if a process a daemon ? Post 302216347 by fsahog on Friday 18th of July 2008 08:24:36 PM
Old 07-18-2008
I would build in a logic context so that you can be sure. For example, SIGHUP is a non-zero vector when a process is started. It is good practice to null the vector after one's fork/exec (in the child, of course), obviously to avoid the humiliation of having one's nice daemon code quit when the starter-upper terminates. So, then, your test could be "is my SIGHUP vector NULL?" and process accordingly. Use your OS facilities to good purpose, and let them help identify your context, too.

Last edited by fsahog; 07-18-2008 at 09:25 PM.. Reason: To make it better
 

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Ns_Exec(3aolserver)					   AOLserver Library Procedures 				       Ns_Exec(3aolserver)

__________________________________________________________________________________________________________________________________________________

NAME
Ns_ExecArgblk, Ns_ExecArgv, Ns_ExecProc, Ns_ExecProcess, Ns_Fork, Ns_GetEnviron, Ns_WaitForProcess, Ns_WaitProcess, ns_fork - External process execution SYNOPSIS
#include "ns.h" int Ns_ExecArgblk(char *exec, char *dir, int fdin, int fdout, char *args, Ns_Set *env) int Ns_ExecArgv(char *exec, char *dir, int fdin, int fdout, char **argv, Ns_Set *env) int Ns_ExecProc(char *exec, char **argv) int Ns_ExecProcess(char *exec, char *dir, int fdin, int fdout, char *args, Ns_Set *env) int Ns_Fork(void) char **Ns_GetEnviron(void) int Ns_WaitForProcess(int pid, int *statusPtr) int Ns_WaitProcess(int pid) int ns_fork(void) _________________________________________________________________ DESCRIPTION
These functions handle fork and exec operations. See files: nsd/exec.c, nsd/tclenv.c and nsthread/fork.c. Ns_ExecArgblk(exec, dir, fdin, fdout, args, env) Executes a command in a child process. Return process id of child process exec'ing the command or -1 on failure. Provides extended error checking and error messages. Ns_ExecArgv(exec, dir, fdin, fdout, argv, env) Execute a command in a child process using fork(2) and execve(2), returns the process id of child process exec'ing the command or -1 on failure. The child sends an extended error message to the parent. Ns_ExecProc(exec, argv) Executes a command in a child process. Returns the process id of the child process exec'ing the command or -1 on failure. Simpli- fies call to Ns_ExecArgv. Ns_ExecProcess(exec, dir, fdin, fdout, args, env) Executes a command in a child process. Returns the process id of the child process exec'ing the command or -1 on failure. Calls Ns_ExecArgblk with same arguments. Ns_Fork() Posix style fork(), using fork1() on Solaris if needed. See fork(2) man page. Calls ns_fork. Ns_GetEnviron() Returns pointer to the environment vector. Ns_WaitForProcess(pid, statusPtr) Wait for child process. Returns NS_OK on success, or NS_ERROR on failure. *statusPtr is set to the exit code of the child process. Ns_WaitProcess(pid) Wait for child process. Calls Ns_WaitForProcess with NULL statusPtr. Returns NS_OK on success, or NS_ERROR on failure. ns_fork() Posix style fork(), using fork1() on Solaris if needed. SEE ALSO
nsd(1), info(n) KEYWORDS
AOLserver 4.0 Ns_Exec(3aolserver)
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