From e11c7df86144bed383ac6bbeaecc3017d18b37db Mon Sep 17 00:00:00 2001 From: Toby Goodwin Date: Mon, 11 Jan 1999 10:55:18 +0000 Subject: beta: rc-1.5b4 --- system-bsd.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 system-bsd.c (limited to 'system-bsd.c') diff --git a/system-bsd.c b/system-bsd.c new file mode 100644 index 0000000..3babaea --- /dev/null +++ b/system-bsd.c @@ -0,0 +1,60 @@ +/* signal-safe read and write (for BSD slow devices). writeall() also +allows partial writes */ + +#include + +#include "rc.h" +#include "jbwrap.h" +#include "wait.h" + +Jbwrap slowbuf; +volatile sig_atomic_t slow; + +static char *safe_buf; +static size_t safe_remain; + +extern void writeall(int fd, char *buf, size_t remain) { + int i; + + safe_buf = buf; + safe_remain = remain; + for (i = 0; safe_remain > 0; buf += i, safe_remain -= i) { + if (sigsetjmp(slowbuf.j, 1) == 0) { + slow = TRUE; + if ((i = write(fd, safe_buf, safe_remain)) <= 0) + break; /* abort silently on errors in write() */ + } else + break; + } + slow = FALSE; + sigchk(); +} + +extern int rc_read(int fd, char *buf, size_t n) { + ssize_t r; + + if (sigsetjmp(slowbuf.j, 1) == 0) { + slow = TRUE; + r = read(fd, buf, n); + } else { + errno = EINTR; + r = -1; + } + slow = FALSE; + + return r; +} + +static int r = -1; +extern pid_t rc_wait(int *stat) { + if (sigsetjmp(slowbuf.j, 1) == 0) { + slow = TRUE; + r = wait(stat); + } else { + errno = EINTR; + r = -1; + } + slow = FALSE; + + return r; +} -- cgit v1.2.3