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-rw-r--r--src/popen.c320
1 files changed, 164 insertions, 156 deletions
diff --git a/src/popen.c b/src/popen.c
index 06f27c0b..193efc0f 100644
--- a/src/popen.c
+++ b/src/popen.c
@@ -1,54 +1,43 @@
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-#include <signal.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-
-#include "log.h"
-#include "popen.h"
#include "common.h"
/*
struct mypopen {
- pid_t pid;
- FILE *fp;
- struct mypopen *next;
- struct mypopen *prev;
+ pid_t pid;
+ FILE *fp;
+ struct mypopen *next;
+ struct mypopen *prev;
};
static struct mypopen *mypopen_root = NULL;
static void mypopen_add(FILE *fp, pid_t *pid) {
- struct mypopen *mp = malloc(sizeof(struct mypopen));
- if(!mp) {
- fatal("Cannot allocate %zu bytes", sizeof(struct mypopen))
- return;
- }
-
- mp->fp = fp;
- mp->pid = pid;
- mp->next = popen_root;
- mp->prev = NULL;
- if(mypopen_root) mypopen_root->prev = mp;
- mypopen_root = mp;
+ struct mypopen *mp = malloc(sizeof(struct mypopen));
+ if(!mp) {
+ fatal("Cannot allocate %zu bytes", sizeof(struct mypopen))
+ return;
+ }
+
+ mp->fp = fp;
+ mp->pid = pid;
+ mp->next = popen_root;
+ mp->prev = NULL;
+ if(mypopen_root) mypopen_root->prev = mp;
+ mypopen_root = mp;
}
static void mypopen_del(FILE *fp) {
- struct mypopen *mp;
-
- for(mp = mypopen_root; mp; mp = mp->next)
- if(mp->fd == fp) break;
-
- if(!mp) error("Cannot find mypopen() file pointer in open childs.");
- else {
- if(mp->next) mp->next->prev = mp->prev;
- if(mp->prev) mp->prev->next = mp->next;
- if(mypopen_root == mp) mypopen_root = mp->next;
- free(mp);
- }
+ struct mypopen *mp;
+
+ for(mp = mypopen_root; mp; mp = mp->next)
+ if(mp->fd == fp) break;
+
+ if(!mp) error("Cannot find mypopen() file pointer in open childs.");
+ else {
+ if(mp->next) mp->next->prev = mp->prev;
+ if(mp->prev) mp->prev->next = mp->next;
+ if(mypopen_root == mp) mypopen_root = mp->next;
+ free(mp);
+ }
}
*/
#define PIPE_READ 0
@@ -56,133 +45,152 @@ static void mypopen_del(FILE *fp) {
FILE *mypopen(const char *command, pid_t *pidptr)
{
- int pipefd[2];
-
- if(pipe(pipefd) == -1) return NULL;
-
- int pid = fork();
- if(pid == -1) {
- close(pipefd[PIPE_READ]);
- close(pipefd[PIPE_WRITE]);
- return NULL;
- }
- if(pid != 0) {
- // the parent
- *pidptr = pid;
- close(pipefd[PIPE_WRITE]);
- FILE *fp = fdopen(pipefd[PIPE_READ], "r");
- /*mypopen_add(fp, pid);*/
- return(fp);
- }
- // the child
-
- // close all files
- int i;
- for(i = (int) (sysconf(_SC_OPEN_MAX) - 1); i > 0; i--)
- if(i != STDIN_FILENO && i != STDERR_FILENO && i != pipefd[PIPE_WRITE]) close(i);
-
- // move the pipe to stdout
- if(pipefd[PIPE_WRITE] != STDOUT_FILENO) {
- dup2(pipefd[PIPE_WRITE], STDOUT_FILENO);
- close(pipefd[PIPE_WRITE]);
- }
+ int pipefd[2];
+
+ if(pipe(pipefd) == -1) return NULL;
+
+ int pid = fork();
+ if(pid == -1) {
+ close(pipefd[PIPE_READ]);
+ close(pipefd[PIPE_WRITE]);
+ return NULL;
+ }
+ if(pid != 0) {
+ // the parent
+ *pidptr = pid;
+ close(pipefd[PIPE_WRITE]);
+ FILE *fp = fdopen(pipefd[PIPE_READ], "r");
+ /*mypopen_add(fp, pid);*/
+ return(fp);
+ }
+ // the child
+
+ // close all files
+ int i;
+ for(i = (int) (sysconf(_SC_OPEN_MAX) - 1); i > 0; i--)
+ if(i != STDIN_FILENO && i != STDERR_FILENO && i != pipefd[PIPE_WRITE]) close(i);
+
+ // move the pipe to stdout
+ if(pipefd[PIPE_WRITE] != STDOUT_FILENO) {
+ dup2(pipefd[PIPE_WRITE], STDOUT_FILENO);
+ close(pipefd[PIPE_WRITE]);
+ }
#ifdef DETACH_PLUGINS_FROM_NETDATA
- // this was an attempt to detach the child and use the suspend mode charts.d
- // unfortunatelly it does not work as expected.
+ // this was an attempt to detach the child and use the suspend mode charts.d
+ // unfortunatelly it does not work as expected.
+
+ // fork again to become session leader
+ pid = fork();
+ if(pid == -1)
+ error("pre-execution of command '%s' on pid %d: Cannot fork 2nd time.", command, getpid());
- // fork again to become session leader
- pid = fork();
- if(pid == -1) fprintf(stderr, "Cannot fork again on pid %d\n", getpid());
- if(pid != 0) {
- // the parent
- exit(0);
- }
+ if(pid != 0) {
+ // the parent
+ exit(0);
+ }
- // set a new process group id for just this child
- if( setpgid(0, 0) != 0 )
- error("Cannot set a new process group for pid %d (%s)", getpid(), strerror(errno));
+ // set a new process group id for just this child
+ if( setpgid(0, 0) != 0 )
+ error("pre-execution of command '%s' on pid %d: Cannot set a new process group.", command, getpid());
- if( getpgid(0) != getpid() )
- error("Process group set is incorrect. Expected %d, found %d", getpid(), getpgid(0));
+ if( getpgid(0) != getpid() )
+ error("pre-execution of command '%s' on pid %d: Cannot set a new process group. Process group set is incorrect. Expected %d, found %d", command, getpid(), getpid(), getpgid(0));
- if( setsid() != 0 )
- error("Cannot set session id for pid %d (%s)", getpid(), strerror(errno));
+ if( setsid() != 0 )
+ error("pre-execution of command '%s' on pid %d: Cannot set session id.", command, getpid());
- fprintf(stdout, "MYPID %d\n", getpid());
- fflush(NULL);
+ fprintf(stdout, "MYPID %d\n", getpid());
+ fflush(NULL);
#endif
- // reset all signals
- {
- sigset_t sigset;
- sigfillset(&sigset);
-
- if(pthread_sigmask(SIG_UNBLOCK, &sigset, NULL) == -1) {
- error("Could not block signals for threads");
- }
- // We only need to reset ignored signals.
- // Signals with signal handlers are reset by default.
- struct sigaction sa;
- sigemptyset(&sa.sa_mask);
- sa.sa_handler = SIG_DFL;
- sa.sa_flags = 0;
- if(sigaction(SIGPIPE, &sa, NULL) == -1) {
- error("Failed to change signal handler for SIGTERM");
- }
- }
-
-
- info("executing command: '%s' on pid %d.", command, getpid());
- execl("/bin/sh", "sh", "-c", command, NULL);
- exit(1);
+ // reset all signals
+ {
+ sigset_t sigset;
+ sigfillset(&sigset);
+
+ if(pthread_sigmask(SIG_UNBLOCK, &sigset, NULL) == -1)
+ error("pre-execution of command '%s' on pid %d: could not unblock signals for threads.", command, getpid());
+
+ // We only need to reset ignored signals.
+ // Signals with signal handlers are reset by default.
+ struct sigaction sa;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_handler = SIG_DFL;
+ sa.sa_flags = 0;
+
+ if(sigaction(SIGINT, &sa, NULL) == -1)
+ error("pre-execution of command '%s' on pid %d: failed to set default signal handler for SIGINT.", command, getpid());
+
+ if(sigaction(SIGTERM, &sa, NULL) == -1)
+ error("pre-execution of command '%s' on pid %d: failed to set default signal handler for SIGTERM.", command, getpid());
+
+ if(sigaction(SIGPIPE, &sa, NULL) == -1)
+ error("pre-execution of command '%s' on pid %d: failed to set default signal handler for SIGPIPE.", command, getpid());
+
+ if(sigaction(SIGHUP, &sa, NULL) == -1)
+ error("pre-execution of command '%s' on pid %d: failed to set default signal handler for SIGHUP.", command, getpid());
+
+ if(sigaction(SIGUSR1, &sa, NULL) == -1)
+ error("pre-execution of command '%s' on pid %d: failed to set default signal handler for SIGUSR1.", command, getpid());
+
+ if(sigaction(SIGUSR2, &sa, NULL) == -1)
+ error("pre-execution of command '%s' on pid %d: failed to set default signal handler for SIGUSR2.", command, getpid());
+ }
+
+ info("executing command: '%s' on pid %d.", command, getpid());
+ execl("/bin/sh", "sh", "-c", command, NULL);
+ exit(1);
}
int mypclose(FILE *fp, pid_t pid) {
- debug(D_EXIT, "Request to mypclose() on pid %d", pid);
-
- /*mypopen_del(fp);*/
- fclose(fp);
-
- siginfo_t info;
- if(waitid(P_PID, (id_t) pid, &info, WEXITED) != -1) {
- switch(info.si_code) {
- case CLD_EXITED:
- error("pid %d exited with code %d.", info.si_pid, info.si_status);
- return(info.si_status);
- break;
-
- case CLD_KILLED:
- error("pid %d killed by signal %d.", info.si_pid, info.si_status);
- return(-1);
- break;
-
- case CLD_DUMPED:
- error("pid %d core dumped by signal %d.", info.si_pid, info.si_status);
- return(-2);
- break;
-
- case CLD_STOPPED:
- error("pid %d stopped by signal %d.", info.si_pid, info.si_status);
- return(0);
- break;
-
- case CLD_TRAPPED:
- error("pid %d trapped by signal %d.", info.si_pid, info.si_status);
- return(-4);
- break;
-
- case CLD_CONTINUED:
- error("pid %d continued by signal %d.", info.si_pid, info.si_status);
- return(0);
- break;
-
- default:
- error("pid %d gave us a SIGCHLD with code %d and status %d.", info.si_pid, info.si_code, info.si_status);
- return(-5);
- break;
- }
- }
- else error("Cannot waitid() for pid %d", pid);
- return 0;
+ debug(D_EXIT, "Request to mypclose() on pid %d", pid);
+
+ /*mypopen_del(fp);*/
+ fclose(fp);
+
+ siginfo_t info;
+ if(waitid(P_PID, (id_t) pid, &info, WEXITED) != -1) {
+ switch(info.si_code) {
+ case CLD_EXITED:
+ if(info.si_status)
+ error("child pid %d exited with code %d.", info.si_pid, info.si_status);
+ return(info.si_status);
+ break;
+
+ case CLD_KILLED:
+ error("child pid %d killed by signal %d.", info.si_pid, info.si_status);
+ return(-1);
+ break;
+
+ case CLD_DUMPED:
+ error("child pid %d core dumped by signal %d.", info.si_pid, info.si_status);
+ return(-2);
+ break;
+
+ case CLD_STOPPED:
+ error("child pid %d stopped by signal %d.", info.si_pid, info.si_status);
+ return(0);
+ break;
+
+ case CLD_TRAPPED:
+ error("child pid %d trapped by signal %d.", info.si_pid, info.si_status);
+ return(-4);
+ break;
+
+ case CLD_CONTINUED:
+ error("child pid %d continued by signal %d.", info.si_pid, info.si_status);
+ return(0);
+ break;
+
+ default:
+ error("child pid %d gave us a SIGCHLD with code %d and status %d.", info.si_pid, info.si_code, info.si_status);
+ return(-5);
+ break;
+ }
+ }
+ else
+ error("Cannot waitid() for pid %d", pid);
+
+ return 0;
}
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