From 0da1a7be25ec7ae3a185dd69d3e3d6e1f5401dbb Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn-Egil=20Dahlberg?= Date: Tue, 24 Jul 2012 17:03:01 +0200 Subject: os_mon: Elucidate port program error messages Try to avoid confusion of the message 'Erlang has closed' by clarifying that the message is sent from os_mon port programs. --- lib/os_mon/c_src/cpu_sup.c | 14 ++++++++++++-- lib/os_mon/c_src/memsup.c | 25 +++++++++++-------------- lib/os_mon/c_src/win32sysinfo.c | 30 ++++++++++++++---------------- 3 files changed, 37 insertions(+), 32 deletions(-) diff --git a/lib/os_mon/c_src/cpu_sup.c b/lib/os_mon/c_src/cpu_sup.c index 9c5f9a6aa5..a0432b3093 100644 --- a/lib/os_mon/c_src/cpu_sup.c +++ b/lib/os_mon/c_src/cpu_sup.c @@ -458,8 +458,18 @@ static void error(char* err_msg) { * if we get error here we have trouble, * silence unnecessary warnings */ - if(write(FD_ERR, err_msg, strlen(err_msg))); - if(write(FD_ERR, "\n", 1)); + char buffer[256] = "[os_mon] cpu supervisor port (cpu_sup): "; + int i = strlen(buffer), j = 0; + int n = strlen(err_msg); + + while(i < 253 && j < n) { + buffer[i++] = err_msg[j++]; + } + buffer[i++] = '\r'; + buffer[i++] = '\n'; + + /* try to use one write only */ + if(write(FD_ERR, buffer, i)); exit(-1); } diff --git a/lib/os_mon/c_src/memsup.c b/lib/os_mon/c_src/memsup.c index 078f20ff98..593a066f98 100644 --- a/lib/os_mon/c_src/memsup.c +++ b/lib/os_mon/c_src/memsup.c @@ -493,7 +493,7 @@ get_basic_mem(unsigned long *tot, unsigned long *used, unsigned long *pagesize){ #elif defined(__linux__) && !defined(_SC_AVPHYS_PAGES) memory_ext me; if (get_mem_procfs(&me) < 0) { - print_error("ProcFS read error."); + print_error("ProcFS read error"); exit(1); } *tot = me.total; @@ -582,7 +582,7 @@ message_loop(int erlin_fd) * Wait for command from Erlang */ if ((res = read(erlin_fd, &cmdLen, 1)) < 0) { - print_error("Error reading from Erlang."); + print_error("Error reading from Erlang"); return; } @@ -603,19 +603,19 @@ message_loop(int erlin_fd) break; case 0: - print_error("Erlang has closed."); + print_error("Erlang has closed"); return; default: - print_error("Error reading from Erlang."); + print_error("Error reading from Erlang"); return; } /* switch() */ } else { /* cmdLen != 1 */ - print_error("Invalid command length (%d) received.", cmdLen); + print_error("Invalid command length (%d) received", cmdLen); return; } } else { /* Erlang end closed */ - print_error("Erlang has closed."); + print_error("Erlang has closed"); return; } } @@ -641,15 +641,12 @@ static void print_error(const char *format,...) { va_list args; + char buffer[256]; va_start(args, format); - fprintf(stderr, "%s: ", program_name); - vfprintf(stderr, format, args); + vsnprintf(buffer, 256, format, args); va_end(args); - fprintf(stderr, " \n"); + /* try to use one write only */ + fprintf(stderr, "[os_mon] memory supervisor port (memsup): %s\r\n", buffer); + fflush(stderr); } - - - - - diff --git a/lib/os_mon/c_src/win32sysinfo.c b/lib/os_mon/c_src/win32sysinfo.c index 2a155aae87..9d4587393f 100644 --- a/lib/os_mon/c_src/win32sysinfo.c +++ b/lib/os_mon/c_src/win32sysinfo.c @@ -89,6 +89,7 @@ typedef BOOL (WINAPI *tfpGetDiskFreeSpaceEx)(LPCTSTR, PULARGE_INTEGER,PULARGE_IN static tfpGetDiskFreeSpaceEx fpGetDiskFreeSpaceEx; +static void print_error(const char *msg); static void return_answer(char* value) { @@ -98,7 +99,7 @@ return_answer(char* value) res = write(1,(char*) &bytes,1); if (res != 1) { - fprintf(stderr,"win32sysinfo:Error writing to pipe"); + print_error("Error writing to pipe"); exit(1); } @@ -107,9 +108,8 @@ return_answer(char* value) while (left > 0) { res = write(1, value+bytes-left, left); - if (res <= 0) - { - fprintf(stderr,"win32sysinfo:Error writing to pipe"); + if (res <= 0) { + print_error("Error writing to pipe"); exit(1); } left -= res; @@ -248,7 +248,6 @@ message_loop() char cmd[512]; int res; - fprintf(stderr,"in message_loop\n"); /* Startup ACK. */ return_answer(OK); while (1) @@ -257,12 +256,12 @@ message_loop() * Wait for command from Erlang */ if ((res = read(0, &cmdLen, 1)) < 0) { - fprintf(stderr,"win32sysinfo:Error reading from Erlang."); + print_error("Error reading from Erlang"); return; } if (res != 1){ /* Exactly one byte read ? */ - fprintf(stderr,"win32sysinfo:Erlang has closed."); + print_error("Erlang has closed"); return; } if ((res = read(0, &cmd, cmdLen)) == cmdLen){ @@ -291,11 +290,11 @@ message_loop() return_answer("xEND"); } else if (res == 0) { - fprintf(stderr,"win32sysinfo:Erlang has closed."); + print_error("Erlang has closed"); return; } else { - fprintf(stderr,"win32sysinfo:Error reading from Erlang."); + print_error("Error reading from Erlang"); return; } } @@ -309,10 +308,9 @@ int main(int argc, char ** argv){ message_loop(); return 0; } - - - - - - - +static void +print_error(const char *msg) { + /* try to use one write only */ + fprintf(stderr, "[os_mon] win32 supervisor port (win32sysinfo): %s\r\n", msg); + fflush(stderr); +} -- cgit v1.2.3