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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
commit | 5e61585d76ae77fd5e9e96ebabb57afa4d74880d (patch) | |
tree | 2b467823aaeebc7ef8bc9e3cabe8074eaef1666d /src/util/load_file.c | |
parent | Initial commit. (diff) | |
download | postfix-5e61585d76ae77fd5e9e96ebabb57afa4d74880d.tar.xz postfix-5e61585d76ae77fd5e9e96ebabb57afa4d74880d.zip |
Adding upstream version 3.5.24.upstream/3.5.24upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/util/load_file.c')
-rw-r--r-- | src/util/load_file.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/util/load_file.c b/src/util/load_file.c new file mode 100644 index 0000000..4e575d1 --- /dev/null +++ b/src/util/load_file.c @@ -0,0 +1,80 @@ +/*++ +/* NAME +/* load_file 3 +/* SUMMARY +/* load file with some prejudice +/* SYNOPSIS +/* #include <load_file.h> +/* +/* void load_file(path, action, context) +/* const char *path; +/* void (*action)(VSTREAM, void *); +/* void *context; +/* DESCRIPTION +/* This routine reads a file and reads it again when the +/* file changed recently. +/* +/* Arguments: +/* .IP path +/* The file to be opened, read-only. +/* .IP action +/* The function that presumably reads the file. +/* .IP context +/* Application-specific context for the action routine. +/* DIAGNOSTICS +/* Fatal errors: out of memory, cannot open file. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <sys/stat.h> +#include <time.h> + +/* Utility library. */ + +#include <msg.h> +#include <vstream.h> +#include <iostuff.h> +#include <load_file.h> +#include <warn_stat.h> + +/* load_file - load file with some prejudice */ + +void load_file(const char *path, LOAD_FILE_FN action, void *context) +{ + VSTREAM *fp; + struct stat st; + time_t before; + time_t after; + + /* + * Read the file again if it is hot. This may result in reading a partial + * parameter name or missing end marker when a file changes in the middle + * of a read. + */ + for (before = time((time_t *) 0); /* see below */ ; before = after) { + if ((fp = vstream_fopen(path, O_RDONLY, 0)) == 0) + msg_fatal("open %s: %m", path); + action(fp, context); + if (fstat(vstream_fileno(fp), &st) < 0) + msg_fatal("fstat %s: %m", path); + if (vstream_ferror(fp) || vstream_fclose(fp)) + msg_fatal("read %s: %m", path); + after = time((time_t *) 0); + if (st.st_mtime < before - 1 || st.st_mtime > after) + break; + if (msg_verbose) + msg_info("pausing to let %s cool down", path); + doze(300000); + } +} |