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-rw-r--r--erts/emulator/sys/unix/erl_child_setup.c87
-rw-r--r--erts/emulator/sys/unix/sys_drivers.c42
2 files changed, 91 insertions, 38 deletions
diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index de61726e5b..6b9ddd8da4 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -75,7 +75,7 @@
//#define HARD_DEBUG
#ifdef HARD_DEBUG
-#define DEBUG_PRINT(fmt, ...) fprintf(stderr, fmt "\r\n", ##__VA_ARGS__)
+#define DEBUG_PRINT(fmt, ...) fprintf(stderr, "%d:" fmt "\r\n", getpid(), ##__VA_ARGS__)
#else
#define DEBUG_PRINT(fmt, ...)
#endif
@@ -131,12 +131,13 @@ static int sigchld_pipe[2];
static int
start_new_child(int pipes[])
{
+ int errln = -1;
int size, res, i, pos = 0;
char *buff, *o_buff;
- char *cmd, *wd, **new_environ, **args = NULL;
+ char *cmd, *cwd, *wd, **new_environ, **args = NULL;
- Sint cnt, flags;
+ Sint32 cnt, flags;
/* only child executes here */
@@ -145,6 +146,7 @@ start_new_child(int pipes[])
} while(res < 0 && (errno == EINTR || errno == ERRNO_BLOCK));
if (res <= 0) {
+ errln = __LINE__;
goto child_error;
}
@@ -156,10 +158,12 @@ start_new_child(int pipes[])
if ((res = read(pipes[0], buff + pos, size - pos)) < 0) {
if (errno == ERRNO_BLOCK || errno == EINTR)
continue;
+ errln = __LINE__;
goto child_error;
}
if (res == 0) {
errno = EPIPE;
+ errln = __LINE__;
goto child_error;
}
pos += res;
@@ -168,12 +172,16 @@ start_new_child(int pipes[])
o_buff = buff;
flags = get_int32(buff);
- buff += sizeof(Sint32);
+ buff += sizeof(flags);
DEBUG_PRINT("flags = %d", flags);
cmd = buff;
buff += strlen(buff) + 1;
+
+ cwd = buff;
+ buff += strlen(buff) + 1;
+
if (*buff == '\0') {
wd = NULL;
} else {
@@ -185,10 +193,10 @@ start_new_child(int pipes[])
DEBUG_PRINT("wd = %s", wd);
cnt = get_int32(buff);
- buff += sizeof(Sint32);
+ buff += sizeof(cnt);
new_environ = malloc(sizeof(char*)*(cnt + 1));
- DEBUG_PRINT("env_len = %ld", cnt);
+ DEBUG_PRINT("env_len = %d", cnt);
for (i = 0; i < cnt; i++, buff++) {
new_environ[i] = buff;
while(*buff != '\0') buff++;
@@ -198,7 +206,7 @@ start_new_child(int pipes[])
if (o_buff + size != buff) {
/* This is a spawn executable call */
cnt = get_int32(buff);
- buff += sizeof(Sint32);
+ buff += sizeof(cnt);
args = malloc(sizeof(char*)*(cnt + 1));
for (i = 0; i < cnt; i++, buff++) {
args[i] = buff;
@@ -209,7 +217,12 @@ start_new_child(int pipes[])
if (o_buff + size != buff) {
errno = EINVAL;
- goto child_error;
+ errln = __LINE__;
+ fprintf(stderr,"erl_child_setup: failed with protocol "
+ "error %d on line %d", errno, errln);
+ /* we abort here as it is most likely a symptom of an
+ emulator/erl_child_setup bug */
+ abort();
}
DEBUG_PRINT("read ack");
@@ -221,12 +234,32 @@ start_new_child(int pipes[])
ASSERT(res == sizeof(proto));
}
} while(res < 0 && (errno == EINTR || errno == ERRNO_BLOCK));
+
if (res < 1) {
errno = EPIPE;
+ errln = __LINE__;
goto child_error;
}
- DEBUG_PRINT("Do that forking business: '%s'\n",cmd);
+ DEBUG_PRINT("Set cwd to: '%s'",cwd);
+
+ if (chdir(cwd) < 0) {
+ /* This is not good, it probably means that the cwd of
+ beam is invalid. We ignore it and try anyways as
+ the child might now need a cwd or the chdir below
+ could take us to a valid directory.
+ */
+ }
+
+ DEBUG_PRINT("Set wd to: '%s'",wd);
+
+ if (wd && chdir(wd) < 0) {
+ int err = errno;
+ fprintf(stderr,"spawn: Could not cd to %s\r\n", wd);
+ _exit(err);
+ }
+
+ DEBUG_PRINT("Do that forking business: '%s'",cmd);
/* When the dup2'ing below is done, only
fd's 0, 1, 2 and maybe 3, 4 should survive the
@@ -236,25 +269,34 @@ start_new_child(int pipes[])
if (flags & FORKER_FLAG_USE_STDIO) {
/* stdin for process */
if (flags & FORKER_FLAG_DO_WRITE &&
- dup2(pipes[0], 0) < 0)
+ dup2(pipes[0], 0) < 0) {
+ errln = __LINE__;
goto child_error;
+ }
/* stdout for process */
if (flags & FORKER_FLAG_DO_READ &&
- dup2(pipes[1], 1) < 0)
+ dup2(pipes[1], 1) < 0) {
+ errln = __LINE__;
goto child_error;
+ }
}
else { /* XXX will fail if pipes[0] == 4 (unlikely..) */
- if (flags & FORKER_FLAG_DO_READ && dup2(pipes[1], 4) < 0)
+ if (flags & FORKER_FLAG_DO_READ && dup2(pipes[1], 4) < 0) {
+ errln = __LINE__;
goto child_error;
- if (flags & FORKER_FLAG_DO_WRITE && dup2(pipes[0], 3) < 0)
+ }
+ if (flags & FORKER_FLAG_DO_WRITE && dup2(pipes[0], 3) < 0) {
+ errln = __LINE__;
goto child_error;
+ }
}
- if (dup2(pipes[2], 2) < 0)
- goto child_error;
-
- if (wd && chdir(wd) < 0)
+ /* we do the dup2 of stderr last so that errors
+ in child_error will be printed to stderr */
+ if (dup2(pipes[2], 2) < 0) {
+ errln = __LINE__;
goto child_error;
+ }
#if defined(USE_SETPGRP_NOARGS) /* SysV */
(void) setpgrp();
@@ -276,9 +318,14 @@ start_new_child(int pipes[])
} else {
execle(SHELL, "sh", "-c", cmd, (char *) NULL, new_environ);
}
+
+ DEBUG_PRINT("exec error: %d",errno);
+ _exit(errno);
+
child_error:
- DEBUG_PRINT("exec error: %d\r\n",errno);
- _exit(128 + errno);
+ fprintf(stderr,"erl_child_setup: failed with error %d on line %d\r\n",
+ errno, errln);
+ _exit(errno);
}
@@ -469,7 +516,7 @@ main(int argc, char *argv[])
proto.action = ErtsSysForkerProtoAction_SigChld;
proto.u.sigchld.error_number = ibuff[1];
- DEBUG_PRINT("send %s to %d", buff, uds_fd);
+ DEBUG_PRINT("send sigchld to %d (errno = %d)", uds_fd, ibuff[1]);
if (write(uds_fd, &proto, sizeof(proto)) < 0) {
if (errno == EINTR)
continue;
diff --git a/erts/emulator/sys/unix/sys_drivers.c b/erts/emulator/sys/unix/sys_drivers.c
index 3d7be020e1..400f163652 100644
--- a/erts/emulator/sys/unix/sys_drivers.c
+++ b/erts/emulator/sys/unix/sys_drivers.c
@@ -554,7 +554,7 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
ErtsSysDriverData *dd;
char *cmd_line;
char wd_buff[MAXPATHLEN+1];
- char *wd;
+ char *wd, *cwd;
int ifd[2], ofd[2], stderrfd;
if (pipe(ifd) < 0) return ERL_DRV_ERROR_ERRNO;
@@ -631,24 +631,22 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
return ERL_DRV_ERROR_ERRNO;
}
- if (opts->wd == NULL) {
- if ((wd = getcwd(wd_buff, MAXPATHLEN+1)) == NULL) {
- /* on some OSs this call opens a fd in the
- background which means that this can
- return EMFILE */
- int err = errno;
- close_pipes(ifd, ofd);
- erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
- if (new_environ != environ)
- erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ);
- erts_smp_rwmtx_runlock(&environ_rwmtx);
- errno = err;
- return ERL_DRV_ERROR_ERRNO;
- }
- } else {
- wd = opts->wd;
+ if ((cwd = getcwd(wd_buff, MAXPATHLEN+1)) == NULL) {
+ /* on some OSs this call opens a fd in the
+ background which means that this can
+ return EMFILE */
+ int err = errno;
+ close_pipes(ifd, ofd);
+ erts_free(ERTS_ALC_T_TMP, (void *) cmd_line);
+ if (new_environ != environ)
+ erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ);
+ erts_smp_rwmtx_runlock(&environ_rwmtx);
+ errno = err;
+ return ERL_DRV_ERROR_ERRNO;
}
+ wd = opts->wd;
+
{
struct iovec *io_vector;
int iov_len = 5;
@@ -660,6 +658,8 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
| (opts->read_write & DO_READ ? FORKER_FLAG_DO_READ : 0)
| (opts->read_write & DO_WRITE ? FORKER_FLAG_DO_WRITE : 0);
+ if (wd) iov_len++;
+
/* count number of elements in environment */
while(new_environ[env_len] != NULL)
env_len++;
@@ -704,10 +704,16 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name,
io_vector[i++].iov_len = len;
buffsz += len;
- io_vector[i].iov_base = wd;
+ io_vector[i].iov_base = cwd;
io_vector[i].iov_len = strlen(io_vector[i].iov_base) + 1;
buffsz += io_vector[i++].iov_len;
+ if (wd) {
+ io_vector[i].iov_base = wd;
+ io_vector[i].iov_len = strlen(io_vector[i].iov_base) + 1;
+ buffsz += io_vector[i++].iov_len;
+ }
+
io_vector[i].iov_base = nullbuff;
io_vector[i++].iov_len = 1;
buffsz += io_vector[i-1].iov_len;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-21 06:23:46 +0000