Messages in this thread | | | Date | Mon, 11 Jan 1999 20:19:18 -0600 | From | Miguel de Icaza <> | Subject | sys_read broken for various /proc files |
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The Linux kernel when requested to read n bytes from a file from /proc will ignore the request and stuff as many bytes as it feels like stuffing.
I include a tests program:
#include <unistd.h> #include <stdio.h> #include <fcntl.h>
static char buffer [8];
main () { int fd;
printf ("Before: [%s]\n", buffer); fd = open ("/proc/locks", O_RDONLY); if (fd == -1){ printf ("Can not open /proc/locks"); exit (1); } read (fd, buffer, 1); read (fd, buffer, 1); read (fd, buffer, 1); read (fd, buffer, 1); read (fd, buffer, 1); read (fd, buffer, 1); read (fd, buffer, 1);
printf ("Read: [%s]\n", buffer); }
miguel.
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