diff options
Diffstat (limited to 'erts/etc/unix/run_erl.c')
| -rw-r--r-- | erts/etc/unix/run_erl.c | 610 |
1 files changed, 577 insertions, 33 deletions
diff --git a/erts/etc/unix/run_erl.c b/erts/etc/unix/run_erl.c index c8414030ca..44efb975ba 100644 --- a/erts/etc/unix/run_erl.c +++ b/erts/etc/unix/run_erl.c @@ -1,7 +1,7 @@ /* * %CopyrightBegin% * - * Copyright Ericsson AB 1996-2013. All Rights Reserved. + * Copyright Ericsson AB 1996-2015. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -41,13 +41,11 @@ #ifdef HAVE_CONFIG_H # include "config.h" #endif - #ifdef HAVE_WORKING_POSIX_OPENPT #ifndef _XOPEN_SOURCE #define _XOPEN_SOURCE 600 #endif #endif - #include <sys/types.h> #include <sys/wait.h> #include <sys/stat.h> @@ -65,6 +63,11 @@ #include <dirent.h> #include <termios.h> #include <time.h> + +#ifdef __ANDROID__ +# include <termios.h> +#endif + #ifdef HAVE_SYSLOG_H # include <syslog.h> #endif @@ -84,25 +87,81 @@ # include <stropts.h> #endif -#include "run_erl_common.h" +#include "run_erl.h" #include "safe_string.h" /* sn_printf, strn_cpy, strn_cat, etc */ +#ifdef O_NONBLOCK +# define DONT_BLOCK_PLEASE O_NONBLOCK +#else +# define DONT_BLOCK_PLEASE O_NDELAY +# ifndef EAGAIN +# define EAGAIN -3898734 +# endif +#endif + +#define noDEBUG + +#define DEFAULT_LOG_GENERATIONS 5 +#define LOG_MAX_GENERATIONS 1000 /* No more than 1000 log files */ +#define LOG_MIN_GENERATIONS 2 /* At least two to switch between */ +#define DEFAULT_LOG_MAXSIZE 100000 +#define LOG_MIN_MAXSIZE 1000 /* Smallast value for changing log file */ +#define LOG_STUBNAME "erlang.log." +#define LOG_PERM 0664 +#define DEFAULT_LOG_ACTIVITY_MINUTES 5 +#define DEFAULT_LOG_ALIVE_MINUTES 15 +#define DEFAULT_LOG_ALIVE_FORMAT "%a %b %e %T %Z %Y" +#define ALIVE_BUFFSIZ 256 + +#define PERM 0600 +#define STATUSFILENAME "/run_erl.log" +#define PIPE_STUBNAME "erlang.pipe" +#define PIPE_STUBLEN strlen(PIPE_STUBNAME) + +#ifndef FILENAME_MAX +#define FILENAME_MAX 250 +#endif + +#ifndef O_SYNC +#define O_SYNC 0 +#define USE_FSYNC 1 +#endif + #define MAX(x,y) ((x) > (y) ? (x) : (y)) +#define FILENAME_BUFSIZ FILENAME_MAX + /* prototypes */ static void usage(char *); +static int create_fifo(char *name, int perm); static int open_pty_master(char **name, int *sfd); static int open_pty_slave(char *name); static void pass_on(pid_t); static void exec_shell(char **); +static void status(const char *format,...); +static void error_logf(int priority, int line, const char *format,...); static void catch_sigchild(int); +static int next_log(int log_num); +static int prev_log(int log_num); +static int find_next_log_num(void); +static int open_log(int log_num, int flags); +static void write_to_log(int* lfd, int* log_num, char* buf, int len); static void daemon_init(void); +static char *simple_basename(char *path); static void init_outbuf(void); static int outbuf_size(void); static void clear_outbuf(void); static char* outbuf_first(void); static void outbuf_delete(int bytes); static void outbuf_append(const char* bytes, int n); +static int write_all(int fd, const char* buf, int len); +static int extract_ctrl_seq(char* buf, int len); +static void set_window_size(unsigned col, unsigned row); + +static ssize_t sf_write(int fd, const void *buffer, size_t len); +static ssize_t sf_read(int fd, void *buffer, size_t len); +static int sf_open(const char *path, int flags, mode_t mode); +static int sf_close(int fd); #ifdef DEBUG static void show_terminal_settings(struct termios *t); @@ -110,11 +169,20 @@ static void show_terminal_settings(struct termios *t); /* static data */ static char fifo1[FILENAME_BUFSIZ], fifo2[FILENAME_BUFSIZ]; +static char statusfile[FILENAME_BUFSIZ]; +static char log_dir[FILENAME_BUFSIZ]; static char pipename[FILENAME_BUFSIZ]; static FILE *stdstatus = NULL; +static int log_generations = DEFAULT_LOG_GENERATIONS; +static int log_maxsize = DEFAULT_LOG_MAXSIZE; +static int log_alive_minutes = DEFAULT_LOG_ALIVE_MINUTES; +static int log_activity_minutes = DEFAULT_LOG_ACTIVITY_MINUTES; +static int log_alive_in_gmt = 0; +static char log_alive_format[ALIVE_BUFFSIZ+1]; static int run_daemon = 0; static char *program_name; static int mfd; /* master pty fd */ +static unsigned protocol_ver = RUN_ERL_LO_VER; /* assume lowest to begin with */ /* * Output buffer. @@ -145,13 +213,29 @@ static char* outbuf_in; LOG_PID|LOG_CONS|LOG_NOWAIT,LOG_USER) #endif +#define ERROR0(Prio,Format) error_logf(Prio,__LINE__,Format"\n") +#define ERROR1(Prio,Format,A1) error_logf(Prio,__LINE__,Format"\n",A1) +#define ERROR2(Prio,Format,A1,A2) error_logf(Prio,__LINE__,Format"\n",A1,A2) + +#ifdef HAVE_STRERROR +# define ADD_ERRNO(Format) "errno=%d '%s'\n"Format"\n",errno,strerror(errno) +#else +# define ADD_ERRNO(Format) "errno=%d\n"Format"\n",errno +#endif +#define ERRNO_ERR0(Prio,Format) error_logf(Prio,__LINE__,ADD_ERRNO(Format)) +#define ERRNO_ERR1(Prio,Format,A1) error_logf(Prio,__LINE__,ADD_ERRNO(Format),A1) + + int main(int argc, char **argv) { int childpid; int sfd = -1; - char *ptyslave=NULL; + int fd; + char *p, *ptyslave=NULL; int i = 1; int off_argv; + int calculated_pipename = 0; + int highest_pipe_num = 0; program_name = argv[0]; @@ -169,16 +253,122 @@ int main(int argc, char **argv) off_argv = i; strn_cpy(pipename, sizeof(pipename), argv[i++]); - - erts_run_erl_log_init(run_daemon,argv[i]); + strn_cpy(log_dir, sizeof(log_dir), argv[i]); + strn_cpy(statusfile, sizeof(statusfile), log_dir); + strn_cat(statusfile, sizeof(statusfile), STATUSFILENAME); #ifdef DEBUG - erts_run_erl_log_status("%s: pid is : %d\n", argv[0], getpid()); + status("%s: pid is : %d\n", argv[0], getpid()); #endif - /* Open read and write fifo */ - if (erts_run_erl_open_fifo(pipename,fifo1,fifo2)) - exit(1); + /* Get values for LOG file handling from the environment */ + if ((p = getenv("RUN_ERL_LOG_ALIVE_MINUTES"))) { + log_alive_minutes = atoi(p); + if (!log_alive_minutes) { + ERROR1(LOG_ERR,"Minimum value for RUN_ERL_LOG_ALIVE_MINUTES is 1 " + "(current value is %s)",p); + } + log_activity_minutes = log_alive_minutes / 3; + if (!log_activity_minutes) { + ++log_activity_minutes; + } + } + if ((p = getenv("RUN_ERL_LOG_ACTIVITY_MINUTES"))) { + log_activity_minutes = atoi(p); + if (!log_activity_minutes) { + ERROR1(LOG_ERR,"Minimum value for RUN_ERL_LOG_ACTIVITY_MINUTES is 1 " + "(current value is %s)",p); + } + } + if ((p = getenv("RUN_ERL_LOG_ALIVE_FORMAT"))) { + if (strlen(p) > ALIVE_BUFFSIZ) { + ERROR1(LOG_ERR, "RUN_ERL_LOG_ALIVE_FORMAT can contain a maximum of " + "%d characters", ALIVE_BUFFSIZ); + } + strn_cpy(log_alive_format, sizeof(log_alive_format), p); + } else { + strn_cpy(log_alive_format, sizeof(log_alive_format), DEFAULT_LOG_ALIVE_FORMAT); + } + if ((p = getenv("RUN_ERL_LOG_ALIVE_IN_UTC")) && strcmp(p,"0")) { + ++log_alive_in_gmt; + } + if ((p = getenv("RUN_ERL_LOG_GENERATIONS"))) { + log_generations = atoi(p); + if (log_generations < LOG_MIN_GENERATIONS) + ERROR1(LOG_ERR,"Minimum RUN_ERL_LOG_GENERATIONS is %d", LOG_MIN_GENERATIONS); + if (log_generations > LOG_MAX_GENERATIONS) + ERROR1(LOG_ERR,"Maximum RUN_ERL_LOG_GENERATIONS is %d", LOG_MAX_GENERATIONS); + } + + if ((p = getenv("RUN_ERL_LOG_MAXSIZE"))) { + log_maxsize = atoi(p); + if (log_maxsize < LOG_MIN_MAXSIZE) + ERROR1(LOG_ERR,"Minimum RUN_ERL_LOG_MAXSIZE is %d", LOG_MIN_MAXSIZE); + } + + /* + * Create FIFOs and open them + */ + + if(*pipename && pipename[strlen(pipename)-1] == '/') { + /* The user wishes us to find a unique pipe name in the specified */ + /* directory */ + DIR *dirp; + struct dirent *direntp; + + calculated_pipename = 1; + dirp = opendir(pipename); + if(!dirp) { + ERRNO_ERR1(LOG_ERR,"Can't access pipe directory '%s'.", pipename); + exit(1); + } + + /* Check the directory for existing pipes */ + + while((direntp=readdir(dirp)) != NULL) { + if(strncmp(direntp->d_name,PIPE_STUBNAME,PIPE_STUBLEN)==0) { + int num = atoi(direntp->d_name+PIPE_STUBLEN+1); + if(num > highest_pipe_num) + highest_pipe_num = num; + } + } + closedir(dirp); + strn_catf(pipename, sizeof(pipename), "%s.%d", + PIPE_STUBNAME, highest_pipe_num+1); + } /* if */ + + for(;;) { + /* write FIFO - is read FIFO for `to_erl' program */ + strn_cpy(fifo1, sizeof(fifo1), pipename); + strn_cat(fifo1, sizeof(fifo1), ".r"); + if (create_fifo(fifo1, PERM) < 0) { + ERRNO_ERR1(LOG_ERR,"Cannot create FIFO %s for writing.", fifo1); + exit(1); + } + + /* read FIFO - is write FIFO for `to_erl' program */ + strn_cpy(fifo2, sizeof(fifo2), pipename); + strn_cat(fifo2, sizeof(fifo2), ".w"); + + /* Check that nobody is running run_erl already */ + if ((fd = sf_open(fifo2, O_WRONLY|DONT_BLOCK_PLEASE, 0)) >= 0) { + /* Open as client succeeded -- run_erl is already running! */ + sf_close(fd); + if (calculated_pipename) { + ++highest_pipe_num; + strn_catf(pipename, sizeof(pipename), "%s.%d", + PIPE_STUBNAME, highest_pipe_num+1); + continue; + } + fprintf(stderr, "Erlang already running on pipe %s.\n", pipename); + exit(1); + } + if (create_fifo(fifo2, PERM) < 0) { + ERRNO_ERR1(LOG_ERR,"Cannot create FIFO %s for reading.", fifo2); + exit(1); + } + break; + } /* * Open master pseudo-terminal @@ -250,7 +440,7 @@ int main(int argc, char **argv) sf_close(2); if (dup(sfd) != 0 || dup(sfd) != 1 || dup(sfd) != 2) { - erts_run_erl_log_status("Cannot dup\n"); + status("Cannot dup\n"); } sf_close(sfd); exec_shell(argv+off_argv); /* exec_shell expects argv[2] to be */ @@ -293,7 +483,9 @@ static void pass_on(pid_t childpid) struct timeval timeout; time_t last_activity; char buf[BUFSIZ]; - int rfd, wfd=0; + char log_alive_buffer[ALIVE_BUFFSIZ+1]; + int lognum; + int rfd, wfd=0, lfd=0; int maxfd; int ready; int got_some = 0; /* from to_erl */ @@ -308,12 +500,13 @@ static void pass_on(pid_t childpid) } #ifdef DEBUG - erts_run_erl_log_status("run_erl: %s opened for reading\n", fifo2); + status("run_erl: %s opened for reading\n", fifo2); #endif /* Open the log file */ - erts_run_erl_log_open(); + lognum = find_next_log_num(); + lfd = open_log(lognum, O_RDWR|O_APPEND|O_CREAT|O_SYNC); /* Enter the work loop */ @@ -332,8 +525,7 @@ static void pass_on(pid_t childpid) writefds_ptr = &writefds; } time(&last_activity); - /* don't assume old BSD bug */ - timeout.tv_sec = erts_run_erl_log_alive_minutes()*60; + timeout.tv_sec = log_alive_minutes*60; /* don't assume old BSD bug */ timeout.tv_usec = 0; ready = select(maxfd + 1, &readfds, writefds_ptr, NULL, &timeout); if (ready < 0) { @@ -363,7 +555,28 @@ static void pass_on(pid_t childpid) /* Check how long time we've been inactive */ time(&now); - erts_run_erl_log_activity(!ready,now,last_activity); + if(!ready || now - last_activity > log_activity_minutes*60) { + /* Either a time out: 15 minutes without action, */ + /* or something is coming in right now, but it's a long time */ + /* since last time, so let's write a time stamp this message */ + struct tm *tmptr; + if (log_alive_in_gmt) { + tmptr = gmtime(&now); + } else { + tmptr = localtime(&now); + } + if (!strftime(log_alive_buffer, ALIVE_BUFFSIZ, log_alive_format, + tmptr)) { + strn_cpy(log_alive_buffer, sizeof(log_alive_buffer), + "(could not format time in 256 positions " + "with current format string.)"); + } + log_alive_buffer[ALIVE_BUFFSIZ] = '\0'; + + sn_printf(buf, sizeof(buf), "\n===== %s%s\n", + ready?"":"ALIVE ", log_alive_buffer); + write_to_log(&lfd, &lognum, buf, strlen(buf)); + } } /* @@ -398,7 +611,7 @@ static void pass_on(pid_t childpid) */ if (FD_ISSET(mfd, &readfds)) { #ifdef DEBUG - erts_run_erl_log_status("Pty master read; "); + status("Pty master read; "); #endif if ((len = sf_read(mfd, buf, BUFSIZ)) <= 0) { sf_close(rfd); @@ -416,7 +629,7 @@ static void pass_on(pid_t childpid) exit(0); } - erts_run_erl_log_write(buf, len); + write_to_log(&lfd, &lognum, buf, len); /* * Save in the output queue. @@ -432,7 +645,7 @@ static void pass_on(pid_t childpid) */ if (FD_ISSET(rfd, &readfds)) { #ifdef DEBUG - erts_run_erl_log_status("FIFO read; "); + status("FIFO read; "); #endif if ((len = sf_read(rfd, buf, BUFSIZ)) < 0) { sf_close(rfd); @@ -461,7 +674,7 @@ static void pass_on(pid_t childpid) * should succeed. But in case of error, we just ignore it. */ if ((wfd = sf_open(fifo1, O_WRONLY|DONT_BLOCK_PLEASE, 0)) < 0) { - erts_run_erl_log_status("Client expected on FIFO %s, but can't open (len=%d)\n", + status("Client expected on FIFO %s, but can't open (len=%d)\n", fifo1, len); sf_close(rfd); rfd = sf_open(fifo2, O_RDONLY|DONT_BLOCK_PLEASE, 0); @@ -473,7 +686,7 @@ static void pass_on(pid_t childpid) } else { #ifdef DEBUG - erts_run_erl_log_status("run_erl: %s opened for writing\n", fifo1); + status("run_erl: %s opened for writing\n", fifo1); #endif } } @@ -489,15 +702,14 @@ static void pass_on(pid_t childpid) /* Write the message */ #ifdef DEBUG - erts_run_erl_log_status("Pty master write; "); + status("Pty master write; "); #endif - len = erts_run_erl_extract_ctrl_seq(buf, len, mfd); + len = extract_ctrl_seq(buf, len); if(len==1 && buf[0] == '\003') { kill(childpid,SIGINT); - } - else if (len>0 && erts_run_erl_write_all(mfd, buf, len) != len) - { + } + else if (len>0 && write_all(mfd, buf, len) != len) { ERRNO_ERR0(LOG_ERR,"Error in writing to terminal."); sf_close(rfd); if(wfd) sf_close(wfd); @@ -506,7 +718,7 @@ static void pass_on(pid_t childpid) } } #ifdef DEBUG - erts_run_erl_log_status("OK\n"); + status("OK\n"); #endif } } @@ -516,6 +728,173 @@ static void catch_sigchild(int sig) { } +/* + * next_log: + * Returns the index number that follows the given index number. + * (Wrapping after log_generations) + */ +static int next_log(int log_num) { + return log_num>=log_generations?1:log_num+1; +} + +/* + * prev_log: + * Returns the index number that precedes the given index number. + * (Wrapping after log_generations) + */ +static int prev_log(int log_num) { + return log_num<=1?log_generations:log_num-1; +} + +/* + * find_next_log_num() + * Searches through the log directory to check which logs that already + * exist. It finds the "hole" in the sequence, and returns the index + * number for the last log in the log sequence. If there is no hole, index + * 1 is returned. + */ +static int find_next_log_num(void) { + int i, next_gen, log_gen; + DIR *dirp; + struct dirent *direntp; + int log_exists[LOG_MAX_GENERATIONS+1]; + int stub_len = strlen(LOG_STUBNAME); + + /* Initialize exiting log table */ + + for(i=log_generations; i>=0; i--) + log_exists[i] = 0; + dirp = opendir(log_dir); + if(!dirp) { + ERRNO_ERR1(LOG_ERR,"Can't access log directory '%s'", log_dir); + exit(1); + } + + /* Check the directory for existing logs */ + + while((direntp=readdir(dirp)) != NULL) { + if(strncmp(direntp->d_name,LOG_STUBNAME,stub_len)==0) { + int num = atoi(direntp->d_name+stub_len); + if(num < 1 || num > log_generations) + continue; + log_exists[num] = 1; + } + } + closedir(dirp); + + /* Find out the next available log file number */ + + next_gen = 0; + for(i=log_generations; i>=0; i--) { + if(log_exists[i]) + if(next_gen) + break; + else + ; + else + next_gen = i; + } + + /* Find out the current log file number */ + + if(next_gen) + log_gen = prev_log(next_gen); + else + log_gen = 1; + + return log_gen; +} /* find_next_log_num() */ + +/* open_log() + * Opens a log file (with given index) for writing. Writing may be + * at the end or a trucnating write, according to flags. + * A LOGGING STARTED and time stamp message is inserted into the log file + */ +static int open_log(int log_num, int flags) +{ + char buf[FILENAME_MAX]; + time_t now; + struct tm *tmptr; + char log_buffer[ALIVE_BUFFSIZ+1]; + int lfd; + + /* Remove the next log (to keep a "hole" in the log sequence) */ + sn_printf(buf, sizeof(buf), "%s/%s%d", + log_dir, LOG_STUBNAME, next_log(log_num)); + unlink(buf); + + /* Create or continue on the current log file */ + sn_printf(buf, sizeof(buf), "%s/%s%d", log_dir, LOG_STUBNAME, log_num); + if((lfd = sf_open(buf, flags, LOG_PERM))<0){ + ERRNO_ERR1(LOG_ERR,"Can't open log file '%s'.", buf); + exit(1); + } + + /* Write a LOGGING STARTED and time stamp into the log file */ + time(&now); + if (log_alive_in_gmt) { + tmptr = gmtime(&now); + } else { + tmptr = localtime(&now); + } + if (!strftime(log_buffer, ALIVE_BUFFSIZ, log_alive_format, + tmptr)) { + strn_cpy(log_buffer, sizeof(log_buffer), + "(could not format time in 256 positions " + "with current format string.)"); + } + log_buffer[ALIVE_BUFFSIZ] = '\0'; + + sn_printf(buf, sizeof(buf), "\n=====\n===== LOGGING STARTED %s\n=====\n", + log_buffer); + if (write_all(lfd, buf, strlen(buf)) < 0) + status("Error in writing to log.\n"); + +#if USE_FSYNC + fsync(lfd); +#endif + + return lfd; +} + +/* write_to_log() + * Writes a message to a log file. If the current log file is full, + * a new log file is opened. + */ +static void write_to_log(int* lfd, int* log_num, char* buf, int len) +{ + int size; + + /* Decide if new logfile needed, and open if so */ + + size = lseek(*lfd,0,SEEK_END); + if(size+len > log_maxsize) { + sf_close(*lfd); + *log_num = next_log(*log_num); + *lfd = open_log(*log_num, O_RDWR|O_CREAT|O_TRUNC|O_SYNC); + } + + /* Write to log file */ + + if (write_all(*lfd, buf, len) < 0) { + status("Error in writing to log.\n"); + } + +#if USE_FSYNC + fsync(*lfd); +#endif +} + +/* create_fifo() + * Creates a new fifo with the given name and permission. + */ +static int create_fifo(char *name, int perm) +{ + if ((mkfifo(name, perm) < 0) && (errno != EEXIST)) + return -1; + return 0; +} + /* open_pty_master() * Find a master device, open and return fd and slave device name. @@ -712,9 +1091,9 @@ static void exec_shell(char **argv) else argv[0] = sh; argv[1] = "-c"; - erts_run_erl_log_status("Args before exec of shell:\n"); + status("Args before exec of shell:\n"); for (vp = argv, i = 0; *vp; vp++, i++) - erts_run_erl_log_status("argv[%d] = %s\n", i, *vp); + status("argv[%d] = %s\n", i, *vp); if (stdstatus) { fclose(stdstatus); } @@ -725,6 +1104,26 @@ static void exec_shell(char **argv) ERRNO_ERR0(LOG_ERR,"Could not execv"); } +/* status() + * Prints the arguments to a status file + * Works like printf (see vfrpintf) + */ +static void status(const char *format,...) +{ + va_list args; + time_t now; + + if (stdstatus == NULL) + stdstatus = fopen(statusfile, "w"); + if (stdstatus == NULL) + return; + now = time(NULL); + fprintf(stdstatus, "run_erl [%d] %s", (int)getpid(), ctime(&now)); + va_start(args, format); + vfprintf(stdstatus, format, args); + va_end(args); + fflush(stdstatus); +} static void daemon_init(void) /* As R Stevens wants it, to a certain extent anyway... */ @@ -764,10 +1163,47 @@ static void daemon_init(void) run_daemon = 1; } +/* error_logf() + * Prints the arguments to stderr or syslog + * Works like printf (see vfprintf) + */ +static void error_logf(int priority, int line, const char *format, ...) +{ + va_list args; + va_start(args, format); + +#ifdef HAVE_SYSLOG_H + if (run_daemon) { + vsyslog(priority,format,args); + } + else +#endif + { + time_t now = time(NULL); + fprintf(stderr, "run_erl:%d [%d] %s", line, (int)getpid(), ctime(&now)); + vfprintf(stderr, format, args); + } + va_end(args); +} + static void usage(char *pname) { - fprintf(stderr, "Usage: "); - fprintf(stderr, RUN_ERL_USAGE, pname); + fprintf(stderr, "Usage: %s (pipe_name|pipe_dir/) log_dir \"command [parameters ...]\"\n", pname); + fprintf(stderr, "\nYou may also set the environment variables RUN_ERL_LOG_GENERATIONS\n"); + fprintf(stderr, "and RUN_ERL_LOG_MAXSIZE to the number of log files to use and the\n"); + fprintf(stderr, "size of the log file when to switch to the next log file\n"); +} + +/* Instead of making sure basename exists, we do our own */ +static char *simple_basename(char *path) +{ + char *ptr; + for (ptr = path; *ptr != '\0'; ++ptr) { + if (*ptr == '/') { + path = ptr + 1; + } + } + return path; } static void init_outbuf(void) @@ -838,6 +1274,114 @@ static void outbuf_append(const char* buf, int n) outbuf_in += n; } +/* Call write() until entire buffer has been written or error. + * Return len or -1. + */ +static int write_all(int fd, const char* buf, int len) +{ + int left = len; + int written; + for (;;) { + written = sf_write(fd,buf,left); + if (written == left) { + return len; + } + if (written < 0) { + return -1; + } + left -= written; + buf += written; + } +} + +static ssize_t sf_read(int fd, void *buffer, size_t len) { + ssize_t n = 0; + + do { n = read(fd, buffer, len); } while (n < 0 && errno == EINTR); + + return n; +} + +static ssize_t sf_write(int fd, const void *buffer, size_t len) { + ssize_t n = 0; + + do { n = write(fd, buffer, len); } while (n < 0 && errno == EINTR); + + return n; +} + +static int sf_open(const char *path, int type, mode_t mode) { + int fd = 0; + + do { fd = open(path, type, mode); } while(fd < 0 && errno == EINTR); + + return fd; +} +static int sf_close(int fd) { + int res = 0; + + do { res = close(fd); } while(fd < 0 && errno == EINTR); + + return res; +} +/* Extract any control sequences that are ment only for run_erl + * and should not be forwarded to the pty. + */ +static int extract_ctrl_seq(char* buf, int len) +{ + static const char prefix[] = "\033_"; + static const char suffix[] = "\033\\"; + char* bufend = buf + len; + char* start = buf; + char* command; + char* end; + + for (;;) { + start = find_str(start, bufend-start, prefix); + if (!start) break; + + command = start + strlen(prefix); + end = find_str(command, bufend-command, suffix); + if (end) { + unsigned col, row; + if (sscanf(command,"version=%u", &protocol_ver)==1) { + /*fprintf(stderr,"to_erl v%u\n", protocol_ver);*/ + } + else if (sscanf(command,"winsize=%u,%u", &col, &row)==2) { + set_window_size(col,row); + } + else { + ERROR2(LOG_ERR, "Ignoring unknown ctrl command '%.*s'\n", + (int)(end-command), command); + } + + /* Remove ctrl sequence from buf */ + end += strlen(suffix); + memmove(start, end, bufend-end); + bufend -= end - start; + } + else { + ERROR2(LOG_ERR, "Missing suffix in ctrl sequence '%.*s'\n", + (int)(bufend-start), start); + break; + } + } + return bufend - buf; +} + +static void set_window_size(unsigned col, unsigned row) +{ +#ifdef TIOCSWINSZ + struct winsize ws; + ws.ws_col = col; + ws.ws_row = row; + if (ioctl(mfd, TIOCSWINSZ, &ws) < 0) { + ERRNO_ERR0(LOG_ERR,"Failed to set window size"); + } +#endif +} + + #ifdef DEBUG #define S(x) ((x) > 0 ? 1 : 0) |